Klaus Ehrmann

Research Manager in Technology
Adjunct Associate Professor

Dr Ehrmann is one of the co-founders of nthalmic technologies, a start up company based in Sydney that conducts research and product development in the field of vision correction. As the Director of Technology at nthamic, he is responsible for all technical aspects of R&D, including instrumentation, metrology and implementation of novel optical designs. He also holds a visiting appointment at the University of New South Wales through the School of Optometry and Vision Science. His professional qualifications include a BEng awarded from the Aalen University of Applied Sciences, Germany (1986); an MSc in Machine Design from the Cranfield University, UK (1988) and a PhD in Biomedical Engineering from the University of New South Wales (1997).

 

He has held engineering R&D positions in the USA, Israel, Germany, Australia and the UK. Prior to joining the University of New South Wales for his Doctoral degree, he worked for several years for the National Physical Measurement Laboratory in Germany. In his most recent position at the Brien Holden Vision Institute, Sydney, Australia, Dr Ehrmann had been responsible for instrument development and metrology for more than 20 years. He has received numerous awards for his innovative ideas, has published over 50 peer-reviewed articles, and holds a number of contact lens and instrumentation related patents. His interests concentrate on developing innovative methods and products for vision correction devices, including contact lenses and spectacles, as well as vision related measurements. Dr Ehrmann regularly presents at international conferences and has been invited to speak on topics of translational research, myopia and optical metrology. Through is extensive network within the ophthalmic industry, he remains committed to commercialise novel vision correction devices for the benefit of those in need.

Conference Abstracts
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Panos JG; Ho A; Ehrmann K; Bakaraju RC, 2019, 'An Optically Equivalent Physical Eye Model for In-Vitro Assessment of Intraocular Lenses', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Vancouver, CANADA, Vol. 60, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Vancouver, CANADA, 28 April 2019 - 02 May 2019, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000488800700265&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2019
Ho A; Panos J; Ehrmann K; Cox IG; Erickson P, 2018, 'In vitro evaluation of a novel extended depth of field intra-ocular lens design', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Honolulu, HI, Vol. 59, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Honolulu, HI, 29 April 2018 - 03 May 2018, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000442912500225&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2018
Kim E; Bakaraju RC; Ehrmann K, 2016, 'Current trends of power and spherical aberration profiles in commercial multifocal soft contact lenses', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Seattle, WA, Vol. 57, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Seattle, WA, 01 May 2016 - 05 May 2016, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000394210602395&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2016
Fedtke C; Ehrmann K; Thomas V; Bakaraou RC, 2016, 'Impact of primary and secondary spherical aberrations of multifocal soft contact lenses on vision', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Seattle, WA, Vol. 57, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Seattle, WA, 01 May 2016 - 05 May 2016, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000394174003321&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2016
Kim E; Bakaraju RC; Ehrmann K, 2015, 'Correlation between subjective visual performance and through-focus retinal image quality metrics on presbyopic eyes', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Denver, CO, Vol. 56, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Denver, CO, 03 May 2015 - 07 May 2015, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000362882207144&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2015
McClellan AL; Spierer O; Ehrmann K; Parel J-MA; Gonzalez A; Felix E; Feuer WJ; Sarantopoulos C; Levitt R; Galor A, 2015, 'Corneal Mechanical Hypersensitivity is Correlated with Wind Hyperalgesia, Ocular Symptoms, and Systemic Complaints.', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, Denver, CO, Vol. 56, presented at Annual Meeting of the Association-for-Research-in-Vision-and-Ophthalmology (ARVO), Denver, CO, 03 May 2015 - 07 May 2015, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000362882201116&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2015
Conference Papers
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Stapleton F; Lam E; Tu A; Ehrmann K; Golebiowski B, 2020, 'Sensitivity of the central cornea to cold stimuli', in Investigative Ophthalmology and Visual Science, Association for Research in Vision and Ophthalmology, virtual, pp. 3276 - 3276, presented at ARVO annual meeting, virtual
2020
Golebiowski B; Ehrmann K; Chen J; Truong B; Stapleton F, 2019, 'Liquid jet aesthesiometer repeatability and sex differences in corneal sensitivity.', in Investigative Ophthalmology & Visual Science, Association for Research in Vision and Ophthalmology, Vancouver, Canada, presented at ARVO, Vancouver, Canada, 28 April 2019 - 02 May 2019
2019
Gonzalez A; Ehrmann K; Rowaan C; Lee W; Aguilar MC; McClellan AL; Shalabi NM; Galor A; Parel J-MA, 2014, 'Age-Related Corneal Sensitivity assessed with a modified BHVI-Belmonte Aesthesiometer: a preliminary study', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000433203503334&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2014
Ehrmann K; Bakaraju RC; Chung J; Ozkan J; Ho A; Fedtke C; Falk D; Holden BA, 2014, 'Peripheral refraction and aberration profiles for single vision and multifocal contact lenses and the effect of accommodation', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000433203500130&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2014
Ozkan J; Bakaraju R; Fedtke C; Chung J; Ehrmann K; Ho A; Holden B, 2013, 'Short-term adaptation of accommodative lag, facility and phoria in myopes fitted with multifocal contact lenses', Seattle, Washington, USA, presented at Association for Research in Vision and Ophthalmology, Seattle, Washington, USA, 05 May 2013 - 09 May 2013
2013
Bakaraju RC; Ehrmann K; Falk D; Papas E; Ho A, 2010, 'Prediction of the Optical Performance of Multifocal Contact Lenses Using a Physical Model Eye', in INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, ASSOC RESEARCH VISION OPHTHALMOLOGY INC, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000442393605329&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1
2010
Ehrmann K; Falk D, 2009, 'Optical power mapping using paraxial laser scanning', in BioMEMS and Nanotechology II, Proceedings of SPIE, presented at Progress in Biomedical Optics and Imaging - SPIE, http://dx.doi.org/10.1117/12.806765
2009
Bakaraju RC; Ehrmann K; Falk D; Papas EB; Ho A, 2009, 'Working sketch of an anatomically and optically equivalent physical model eye', in BioMEMS and Nanotechology II, Proceedings of SPIE, presented at Progress in Biomedical Optics and Imaging - SPIE, http://dx.doi.org/10.1117/12.808646
2009
Kim ES; Ehrmann K; Uhlhorn S; Borja D; Parel J, 2009, 'Automated Analysis of OCT Images of the Crystalline Lens', in BioMEMS and Nanotechology II, Proceedings of SPIE, presented at Progress in Biomedical Optics and Imaging - SPIE, http://dx.doi.org/10.1117/12.809986
2009
Bakaraju RC; Ehrmann K; Papas EB; Ho A, 2009, 'A theoretical design of gradient index multifocal contact lens for correcting presbyopia and an attempt to elicit its performance using ray tracing', in BioMEMS and Nanotechology II, Proceedings of SPIE, presented at Progress in Biomedical Optics and Imaging - SPIE, http://dx.doi.org/10.1117/12.808653
2009
Ehrmann K; Conrad F; Papas EB; Ho A, 2006, 'Measurement of ocular parameters under various directions of gaze', in SPIE 2006: Photonics West, SPIE 2006: Photonics West, San Jose, California USA, pp. 1 - 1, presented at SPIE 2006: Photonics West, San Jose, California USA
2006
Holden BA; Lazon De La Jara P; La Hood DL; Terry RL; Ehrmann K, 2006, 'Oxygen Supply to the Cornea with Silicone Hydrogel Contact Lenses', in Contact Lens and Anterior Eye, Stockton Press, Basingstoke, UK, pp. 197 - 197, presented at British Contact Lens Association Annual Clinical Conference (BCLA 2006), Birmingham, England
2006
Ehrmann K; Conrad F; Papas EB; Ho A, 2006, 'Normative ocular parameters for various angles of gaze', in Frank R (ed.), ARVO 2006 Annual Meeting, ARVO 2006: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, pp. 115 - 115, presented at ARVO 2006: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida
2006
Ehrmann K; Conrad F; Papas EB; Ho A, 2006, 'Measurement of ocular parameters under various directions of gaze', in BioMEMS and Nanotechology II, Proceedings of SPIE, San Jose, California USA, presented at Photonics West - BiOS 2006, San Jose, California USA, 21 January 2006 - 26 January 2006, http://dx.doi.org/10.1117/12.674410
2006
Ehrmann K; Ho A; Parel J, 2005, 'Evaluation of porcine crystalline lenses in comparison with molded polymer gel lenses with an improved ex vivo accommodation simulator', in BioMEMS and Nanotechology II, Proceedings of SPIE, San Jose, California USA, pp. 240 - 251, presented at SPIE 2005: BIOS, San Jose, California USA, http://dx.doi.org/10.1117/12.599223
2005
Parel J; Manns F; Denham D; Acosta AC; Yamamoto H; Billotte C; Fernandez V; Abri A; Lamar P; Ziebarth N; Orozco M; Borja D; Hughes TM; Ho A; Augusteyn RC; Ehrmann K; Yoo S; Holden BA, 2005, 'Restoring accommodation: Lens capsule refilling (Phaco-Ersatz) vs accommodating IOLs', in American Journal of Ophthalmology, Elsevier Science Inc, New York, NY, USA, presented at SERI-ARVO 2005 Conference, Singapore
2005
Francis IC; Stapleton FJ; Coroneo MT; Ehrmann K, 2001, 'Eyelid tensometry in older individuals: a correlation with clinical eyelid tension assessment', in Investigative Ophthalmology and Visual Science, Association of Research Vision Ophthalmology Inc, Rockville, MD, USA, pp. 67 - 67, presented at ARVO 2001: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, 29 April 2001 - 04 May 2001, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000168392100358&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a
2001
Francis IC; Stapleton FJ; Coroneo MT; Ehrmann K, 2001, 'Eyelid tensometry in older individuals: a correlation with clinical eyelid tension assessment', in Investigative Ophthalmology and Visual Science, Association of Research Vision Ophthalmology Inc, Rockville, MD, USA, pp. 67 - 67, presented at ARVO 2001: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, 29 April 2001 - 04 May 2001
2001
Francis IC; Ehrmann K; Stapleton FJ; Coroneo MT, 2000, 'Lid tensometry in normals: a preliminary study', in Investigative Ophthalmology and Visual Science, Association of Research Vision Ophthalmology Inc, Rockville, MD, USA, pp. S65 - S65, presented at ARVO 2000: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, 30 April 2000 - 05 May 2000, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000086246700334&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a
2000
Ho A; Ehrmann K, 2000, 'A knife-edge system for evaluating contact lenses', in Ophthalmic Technologies X, San Jose, California USA, pp. 102 - 107, presented at Ophthalmic Technologies X, San Jose, California USA, 22 January 2000 - 23 January 2000
2000
Ehrmann K, 2000, 'A novel instrument to quantify the tension of upper and lower eyelids', in Contact Lens and Anterior Eye, Stockton Press, Basingstoke, UK, pp. 69 - 69, presented at British Contact Lens Association Annual Clinical Conference (BCLA 2000), Birmingham, England
2000
Ho A; Papas EB; Kaykhosrow K; Lum E; Ehrmann K, 2000, 'Tear meniscometry: An early attempt', in Rol P; Joos K; Manns F (eds.), SPIE 2000: Photonics West Meeting, SPIE 2000: Photonics West Meeting, San Jose, California USA, presented at SPIE 2000: Photonics West Meeting, San Jose, California USA, 22 January 2000 - 23 January 2000
2000
Ho A; Papas EB; Kaykhosrow K; Lum E; Ehrmann K, 2000, 'Dacryomeniscometry: An early attempt', in Ophthalmic Technologies X, San Jose, California USA, pp. 23 - 31, presented at Ophthalmic Technologies X, San Jose, California USA, 22 January 2000 - 23 January 2000
2000
Ho A; Ehrmann K, 2000, 'A knife-edge system for evaluating contact lenses', in Rol P; Joos K; Manns F (eds.), SPIE 2000: Photonics West Meeting, SPIE 2000: Photonics West Meeting, San Jose, California USA, presented at SPIE 2000: Photonics West Meeting, San Jose, California USA, 22 January 2000 - 23 January 2000
2000
Ho A; Kaykhosrow K; Papas EB; Ehrmann K, 1999, 'An algorithm for computing tear meniscus profile', in Investigative Ophthalmology and Visual Science, Association of Research Vision Ophthalmology Inc, Rockville, MD, USA, pp. S543 - S543, presented at ARVO 1999: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, 09 May 1999 - 14 May 1999, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000079269202868&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a
1999
Papas EB; Kaykhosrow K; Lum E; Ehrmann K; Ho A, 1999, 'Variability in the measurement of tear meniscus curvature using dacryomeniscometry', in Investigative Ophthalmology and Visual Science, Association of Research Vision Ophthalmology Inc, Rockville, MD, USA, pp. S543 - S543, presented at ARVO 1999: Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida, 09 May 1999 - 14 May 1999, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000079269202867&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a
1999
Conference Posters
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Papas EB; Dahms A; Tahhan N; Carnt N, 2005, 'Power profiles and short term visual performance of soft contact lenses', United States, Vol. 86, pp. 318 - 323, http://dx.doi.org/10.1097/OPX.0b013e318198959e
2005
Conference Presentations
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Fedtke C; Ehrmann K; Falk D; Holden BA, 2012, 'Validation of a quasi real-time global aberrometer: the EyeMapper', Vol. 8209, presented at Ophthalmic Technologies XXII, San Francisco, CA, USA, 21 January 2012 - 22 January 2012, http://dx.doi.org/10.1117/12.906927
2012
Journal articles
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Koumbo Mekountchou IO; Conrad F; Sankaridurg P; Ehrmann K, 2020, 'Peripheral eye length measurement techniques: a review', Clinical and Experimental Optometry, vol. 103, pp. 138 - 147, http://dx.doi.org/10.1111/cxo.12892
2020
Kim E; Ehrmann K, 2020, 'Refractive index of soft contact lens materials measured in packaging solution and standard phosphate buffered saline and the effect on back vertex power calculation', Contact Lens and Anterior Eye, vol. 43, pp. 123 - 129, http://dx.doi.org/10.1016/j.clae.2019.12.005
2020
Sankaridurg P; Bakaraju RC; Naduvilath T; Chen X; Weng R; Tilia D; Xu P; Li W; Conrad F; Smith EL; Ehrmann K, 2019, 'Myopia control with novel central and peripheral plus contact lenses and extended depth of focus contact lenses: 2 year results from a randomised clinical trial', Ophthalmic and Physiological Optics, vol. 39, pp. 294 - 307, http://dx.doi.org/10.1111/opo.12621
2019
Fedtke C; Ehrmann K; Bakaraju RC, 2019, 'Peripheral refraction and spherical aberration profiles with single vision, bifocal and multifocal soft contact lenses', Journal of Optometry, http://dx.doi.org/10.1016/j.optom.2018.11.002
2019
Kim E; Saha M; Ehrmann K, 2018, 'Mechanical Properties of Contact Lens Materials', Eye & contact lens, vol. 44, pp. S148 - S156, http://dx.doi.org/10.1097/ICL.0000000000000442
2018
Ehrmann K; Saha M; Falk D, 2018, 'A novel method to stimulate mechanoreceptors and quantify their threshold values', Biomedical Physics and Engineering Express, vol. 4, http://dx.doi.org/10.1088/2057-1976/aa9b8d
2018
Bakaraju RC; Ehrmann K; Ho A, 2018, 'Extended depth of focus contact lenses vs. two commercial multifocals: Part 1. Optical performance evaluation via computed through-focus retinal image quality metrics', Journal of Optometry, vol. 11, pp. 10 - 20, http://dx.doi.org/10.1016/j.optom.2017.04.003
2018
Fedtke C; Sha J; Thomas V; Ehrmann K; Bakaraju RC, 2017, 'Impact of Spherical Aberration Terms on Multifocal Contact Lens Performance', Optometry and Vision Science, vol. 94, pp. 197 - 207, http://dx.doi.org/10.1097/OPX.0000000000001017
2017
Fedtke C; Ehrmann K; Thomas V; Bakaraju RC, 2017, 'Peripheral Refraction and Aberration Profiles with Multifocal Lenses', Optometry and Vision Science, vol. 94, pp. 876 - 885, http://dx.doi.org/10.1097/OPX.0000000000001112
2017
Kim E; Bakaraju RC; Ehrmann K, 2017, 'Power Profiles of Commercial Multifocal Soft Contact Lenses', Optometry and Vision Science, vol. 94, pp. 183 - 196, http://dx.doi.org/10.1097/OPX.0000000000000998
2017
Tilia D; Munro A; Chung J; Sha J; Delaney S; Kho D; Thomas V; Ehrmann K; Bakaraju RC, 2017, 'Short-term comparison between extended depth-of-focus prototype contact lenses and a commercially-available center-near multifocal', Journal of Optometry, vol. 10, pp. 14 - 25, http://dx.doi.org/10.1016/j.optom.2016.04.003
2017
Tilia D; Bakaraju RC; Chung J; Sha J; Delaney S; Munro A; Thomas V; Ehrmann K; Holden BA, 2016, 'Short-term visual performance of novel extended depth-of-focus contact lenses', Optometry and Vision Science, vol. 93, pp. 435 - 444, http://dx.doi.org/10.1097/OPX.0000000000000806
2016
Spierer O; Felix ER; McClellan AL; Parel JM; Gonzalez A; Feuer WJ; Sarantopoulos CD; Levitt RC; Ehrmann K; Galor A, 2016, 'Corneal mechanical thresholds negatively associate with dry eye and ocular pain symptoms', Investigative Ophthalmology and Visual Science, vol. 57, pp. 617 - 625, http://dx.doi.org/10.1167/iovs.15-18133
2016
Fedtke C; Bakaraju RC; Ehrmann K; Chung J; Thomas V; Holden BA, 2016, 'Visual performance of single vision and multifocal contact lenses in non-presbyopic myopic eyes', Contact Lens and Anterior Eye, vol. 39, pp. 38 - 46, http://dx.doi.org/10.1016/j.clae.2015.07.005
2016
Bakaraju RC; Fedtke C; Ehrmann K; Falk D; Thomas V; Holden BA, 2016, 'Peripheral refraction and higher-order aberrations with cycloplegia and fogging lenses using the BHVI-EyeMapper', Journal of Optometry, vol. 9, pp. 5 - 12, http://dx.doi.org/10.1016/j.optom.2015.06.003
2016
Kim E; Bakaraju RC; Ehrmann K, 2016, 'Reliability of power profiles measured on NIMO TR1504 (Lambda-X) and effects of lens decentration for single vision, bifocal and multifocal contact lenses', Journal of Optometry, vol. 9, pp. 126 - 136, http://dx.doi.org/10.1016/j.optom.2015.10.005
2016
Fedtke C; Ehrmann K; Thomas V; Bakaraju RC, 2016, 'Association between multifocal soft contact lens decentration and visual performance', Clinical Optometry, vol. 8, pp. 57 - 69, http://dx.doi.org/10.2147/OPTO.S108528
2016
Tilia D; Bakaraju RC; Chung J; Sha J; Delaney S; Munro A; Thomas V; Ehrmann K; Holden BA, 2016, 'Erratum: Short-Term Visual Performance of Novel Extended Depth-of-Focus Contact Lenses (Optometry and Vision Science (2016) 93 (435-444))', Optometry and Vision Science, vol. 93, pp. 656, http://dx.doi.org/10.1097/OPX.0000000000000897
2016
Fedtke C; Eehrmann K; Thomas V; Bakaraju RC, 2016, 'Visual performance with multifocal soft contact lenses in non-presbyopic myopic eyes during an adaptation period', Clinical Optometry, vol. 8, pp. 37 - 46, http://dx.doi.org/10.2147/OPTO.S96712
2016
Wagner S; Conrad F; Bakaraju RC; Fedtke C; Ehrmann K; Holden BA, 2015, 'Power profiles of single vision and multifocal soft contact lenses', Contact Lens and Anterior Eye, vol. 38, pp. 2 - 14, http://dx.doi.org/10.1016/j.clae.2014.07.008
2015
Bakaraju RC; Fedtke C; Ehrmann K; Falk D; Thomas V; Holden BA, 2015, 'Peripheral refraction and higher-order aberrations with cycloplegia and fogging lenses using the BHVI-EyeMapper', Journal of Optometry, http://dx.doi.org/10.1016/j.optom.2015.06.003
2015
Nankivil D; Heilman BM; Durkee H; Manns F; Ehrmann K; Kelly S; Arrieta-Quintero E; Parel JM, 2015, 'The zonules selectively alter the shape of the lens during accommodation based on the location of their anchorage points', Investigative Ophthalmology and Visual Science, vol. 56, pp. 1751 - 1760, http://dx.doi.org/10.1167/iovs.14-16082
2015
Bakaraju RC; Fedtke C; Ehrmann K; Ho A, 2015, 'Comparing the relative peripheral refraction effect of single vision and multifocal contact lenses measured using an autorefractor and an aberrometer: A pilot study', Journal of Optometry, vol. 8, pp. 206 - 218, http://dx.doi.org/10.1016/j.optom.2015.01.005
2015
Sha J; Bakaraju RC; Tilia D; Chung J; Delaney S; Munro A; Ehrmann K; Thomas V; Holden BA, 2015, 'Short-term visual performance of soft multifocal contact lenses for presbyopia', Arquivos Brasileiros de Oftalmologia, vol. 79, pp. 73 - 77, http://dx.doi.org/10.5935/0004-2749.20160023
2015
Fedtke C; Ehrmann K; Falk D; Bakaraju RC; Holden BA, 2014, 'The BHVI-eyemapper: Peripheral refraction and aberration profiles', Optometry and Vision Science, vol. 91, pp. 1199 - 1207, http://dx.doi.org/10.1097/OPX.0000000000000364
2014
De La Jara PL; Sankaridurg P; Ehrmann K; Holden BA, 2014, 'Influence of contact lens power profile on peripheral refractive error', Optometry and Vision Science, vol. 91, pp. 642 - 649, http://dx.doi.org/10.1097/OPX.0000000000000273
2014
Rohit A; Ehrmann K; Naduvilath T; Willcox M; Stapleton F, 2014, 'Validating a new device for measuring tear evaporation rates', Ophthalmic and Physiological Optics, vol. 34, pp. 53 - 62, http://dx.doi.org/10.1111/opo.12096
2014
Fedtke C; Bakaraju RC; Ehrmann K; Chung J; Thomas V; Holden BA, 2014, 'Visual performance of single vision and multifocal contact lenses in non-presbyopic myopic eyes', Contact Lens and Anterior Eye, http://dx.doi.org/10.1016/j.clae.2015.07.005
2014
Ozkan J; Bakaraju R; Fedtke C; Chung J; Ehrmann K; Falk D; Ho A; Holden B, 2013, 'Short-term adaptation of accommodative lag, facility and phoria in myopes fitted with multifocal contact lenses', Eye and Contact Lens, vol. 44, pp. S30 - S37, http://dx.doi.org/10.1097/ICL.0000000000000299
2013
Bakaraju RC; Ehrmann K; Falk D; Ho A; Papas EB, 2012, 'Optical performance of multifocal soft contact lenses via a single-pass method', Optometry and Vision Science, vol. 89, pp. 1107 - 1118, http://dx.doi.org/10.1097/OPX.0b013e318264f3e9
2012
Takatori S; Lazon P; Holden BA; Ehrmann K; Ho A; Radke C, 2012, 'In vivo oxygen uptake into the human cornea', Investigative Ophthalmology and Visual Science, vol. 53, pp. 6331 - 6337, http://dx.doi.org/10.1167/iovs.12-10059
2012
Kim E; Ehrmann K, 2012, 'Assessment of accuracy and repeatability of anterior segment optical coherence tomography and reproducibility of measurements using a customised software program', Clinical and Experimental Optometry, vol. 95, pp. 432 - 441, http://dx.doi.org/10.1111/j.1444-0938.2012.00724.x
2012
Takatori S; Lazon P; Holden BA; Ehrmann K; Ho A; Radke C, 2012, 'Author Response: In Vivo Oxygen Uptake into the Human Cornea', Investigative Ophthalmology and Visual Science, vol. 53, pp. 6829, http://dx.doi.org/10.1167/iovs.12-10901
2012
Kim E; Ehrmann K; Uhlhorn S; Borja D; Arrieta-Quintero E; Parela J, 2011, 'Semiautomated analysis of optical coherence tomography crystalline lens images under simulated accommodation', Journal of Biomedical Optics, vol. 16, pp. Article number: 056003, http://dx.doi.org/10.1117/1.3574613
2011
Bakaraju RC; Ehrmann K; Ho A; Papas EB, 2010, 'Inherent ocular spherical aberration and multifocal contact lens optical performance', Optometry and Vision Science, vol. 87, pp. 1009 - 1022, http://dx.doi.org/10.1097/OPX.0b013e3181fbad60
2010
Bakaraju RC; Ehrmann K; Falk D; Ho A; Papas EB, 2010, 'Physical human model eye and methods of its use to analyse optical performance of soft contact lenses', Optics Express, vol. 18, pp. 16868 - 16882, http://dx.doi.org/10.1364/OE.18.016868
2010
Conrad F; Ehrmann K; Choo JD; Holden BA, 2010, 'Finite Element Modeling of Inverted (Inside Out) Soft Contact Lenses', Journal of Medical Devices, vol. 4, pp. 024501-1 - 024501-6, http://dx.doi.org/10.1115/1.4001519
2010
Papas EB; Dahms A; Carnt N; Tahhan N; Ehrmann K, 2009, 'Power profiles and short-term visual performance of soft contact lenses', Optometry and Vision Science, vol. 86, pp. 318 - 323, http://dx.doi.org/10.1097/OPX.0b013e318198959e
2009
Fedtke C; Ehrmann K; Holden BA, 2009, 'A Review of Peripheral Refraction Techniques', Optometry and Vision Science, vol. 86, pp. 429 - 446, http://dx.doi.org/10.1097/OPX.0b013e31819fa727
2009
Bakaraju RC; Ehrmann K; Papas EB; Ho A, 2009, 'Do peripheral refraction and aberration profiles vary with the type of myopia? - An illustration using a ray-tracing approach', Journal of Optometry, vol. 2, pp. 29 - 38, http://dx.doi.org/10.3921/joptom.2009.29
2009
Ehrmann K; Fedtke C; RadiÄ A, 2009, 'Assessment of computer generated vision charts', Contact Lens and Anterior Eye, vol. 32, pp. 133 - 140, http://dx.doi.org/10.1016/j.clae.2008.09.005
2009
Ehrmann K; Kim E; Parel JM, 2008, 'Mechanical properties of intra-ocular lenses', Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 6844, http://dx.doi.org/10.1117/12.787107
2008
Ehrmann K; Ho A; Parel JM, 2008, 'Biomechanical analysis of the accommodation apparatus in humans (Clinical and Experimental Optometry (2008) 91, 3, (302-312))', Clinical and Experimental Optometry, vol. 91, pp. 411, http://dx.doi.org/10.1111/j.1444-0938.2008.00290.x
2008
Bakaraju RC; Ehrmann K; Ho A; Papas EB, 2008, 'Pantoscopic tilt in spectacle-corrected myopia and its effect on peripheral refraction', Ophthalmic and Physiological Optics, vol. 28, pp. 538 - 549, http://dx.doi.org/10.1111/j.1475-1313.2008.00589.x
2008
Bakaraju RC; Ehrmann K; Papas EB; Ho A, 2008, 'Finite schematic eye models and their accuracy to in-vivo data', Vision Research, vol. 48, pp. 1681 - 1694, http://dx.doi.org/10.1016/j.visres.2008.04.009
2008
Ehrmann K; Ho A; Parel JM, 2008, 'Biomechanical analysis of the accommodative apparatus in primates', Clinical and Experimental Optometry, vol. 91, pp. 302 - 312, http://dx.doi.org/10.1111/j.1444-0938.2008.00247.x
2008
Garrett Q; Simmons P; Xu S; Vehige J; Zhao ZJ; Ehrmann K; Willcox MD, 2007, 'Carboxymethylcellulose binds to human corneal epithelial cells and is a modulator of corneal epithelial wound healing', Investigative Ophthalmology and Visual Science, vol. 48, pp. 1559 - 1567, http://dx.doi.org/10.1167/iovs.06-0848
2007
Holden BA; Stretton S; Lazon De La Jara P; Ehrmann K; La Hood DL, 2006, 'The future of contact lenses: Dk/t really matters', Contact Lens Spectrum, pp. 20 - 28
2006
Stapleton FJ; Francis IC; Ehrmann K; Coroneo MT, 2006, 'Lower Eyelid tensometry in younger and older normal subjects', Eye, vol. 20, pp. 166 - 172, http://dx.doi.org/10.1038/sj.eye.6701830
2006
Ehrmann K, 2005, 'How Dk is measured and is there a certifiable standard?', Global Contact, vol. 41, pp. 56 - 58
2005
Ehrmann K; Papas EB; Ho A, 2005, 'A Novel Method for Assessing Variations in Visual Acuity after the Blink', Contact Lens and Anterior Eye, vol. 28, pp. 157 - 162, http://dx.doi.org/10.1016/j.clae.2005.08.001
2005
Ehrmann K; Ho A; Parel JM, 2004, 'Ex vivo accommodation simulator II - Concept and preliminary results', Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 5, pp. 48 - 58, http://dx.doi.org/10.1117/12.539111
2004
Stapleton FJ; Tan ME; Papas EB; Ehrmann K; Golebiowski B; Vega J; Holden BA, 2004, 'Corneal and conjunctival sensitivity to air stimuli', British Journal of Ophthalmology, vol. 88, pp. 1547 - 1551, http://dx.doi.org/10.1136/bjo.2004.044024
2004
Ehrmann K; Francis IC; Stapleton FJ, 2001, 'A novel instrument to quantify the tension of upper and lower eyelids', Contact Lens and Anterior Eye, vol. 24, pp. 65 - 72, http://dx.doi.org/10.1016/S1367-0484(01)80015-1
2001
Ehrmann K; Ho A, 2001, 'Lens prism in RGP manufacturing and its effect on edge quality', Contact Lens and Anterior Eye, vol. 24, pp. 143 - 152, http://dx.doi.org/10.1016/S1367-0484(01)80033-3
2001
Ehrmann K, 2001, 'A novel eyelid tensiometer', Global Contact, pp. 38 - 39
2001
Ehrmann K; Ho A; Schindhelm KH, 1999, 'A novel method to quantify the edge contour of RGP contact lenses', Contact Lens and Anterior Eye, vol. 22, pp. 19 - 25, http://dx.doi.org/10.1016/S1367-0484(99)80027-7
1999
Ehrmann K, 1999, 'A novel method for the measurement of rigid lens profiles', Die Kontaktlinse, pp. 11 - 17
1999
Ehrmann K; Ho A; Schindhelm K, 1998, 'A 3D optical profilometer using a compact disc reading head', Measurement Science and Technology, vol. 9, pp. 1259 - 1265, http://dx.doi.org/10.1088/0957-0233/9/8/019
1998
Ehrmann K; Ho A; Schindhelm KH, 1998, 'A 3D profilometer using a compact disc reading head', Measurement Science and Technology, pp. 1259 - 1265
1998

 The Contact Lens Society of Australia Research Award 1995, for the promotion of scientific research in the field of contact lenses in Australia.

Peter Abel Wissenschaftspreis 1998, presented by Vereinigung Deutscher Contaktlinsenspezialisten for outstanding scientific research in the field of contact lens metrology.

Da Vinci Award 2000 presented by the BCLA for “A Novel Instrument to Quantify the Tension of Upper and Lower Eyelids”.

J Lloyd Hewett Award 2009 presented by the journal Clinical and Experimental Optometry for the best original research paper “Biomechanical analysis of the accommodation apparatus in primates”.

Ophthalmic Equipment

Contact Lenses

Precision Metrology