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Accurate Wide-field Emmetropic Human Eye Model Based On Ocular Wavefront Measurements
University College of Southeast Norway, Norway.
University College of Southeast Norway, Norway.
University College of Southeast Norway, Norway.
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.ORCID iD: 0000-0002-3745-0035
2017 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Purpose: To develop accurate wide-field eye model that reproduces the wavefront aberration of emmetropic eye. To demonstrate the ability to develop individual eye models based on the newly developed generic eye model. Methods: A high resolution Shack-Hartmann wavefront sensor is employed to measure the wavefront error from 40 deg Nasal to 40deg Temporal field and up to 20deg Inferior field of view in steps of 10deg of thirty young emmetropic subjects. Zernike polynomials up to 6th order are fitted to the measured wavefront over a circular exit pupil diameter of 4 mm. A mean wavefront is constructed for each field angle from the measured data set. A lens design program is used to reconstruct an model-eye that reproduces same wavefront as the mean wavefront of the measured data set over each field angle. Anatomical parameters range limits as well as dispersion of the eye (cornea, aqueous, lens and vitreous regions) is incorporated during model development to give a realistic eye model. Our model is different from previously published models in that it does not use Gradient index lens (GRIN) as the lens material simplifying optical modeling and ray tracing. In addition, the cornea and lens components are allowed to be tilted, decentered and rotated with respect to the optical axis to provide a much better fit to the measured set of wavefronts. Results: The RMS values, the wavefront shapes, Zernike coefficients and chromatic performance as predicted by the developed model closely match the measured values over the field of view. Our model does re-reproduce the Nasal-Temporal asymmetries found in the eye performance. Personalized eye models developed using the generic eye model also give excellent fit to the measured wavefront over the field of view. Conclusion: We believe our wide-field emmetropic eye model provides better ability to model peripheral vision. It can also be used for the design of advanced ophthalmic instruments, designing lenses for myopia control and low vision optical aids.

Place, publisher, year, edition, pages
2017. article id P 053
National Category
Ophthalmology
Research subject
Natural Science, Optometry
Identifiers
URN: urn:nbn:se:lnu:diva-74520OAI: oai:DiVA.org:lnu-74520DiVA, id: diva2:1209919
Conference
16th International Myopia Conference, 14-17 September 2017, Aston University, Birmingham, UK
Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-12-07Bibliographically approved

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Baskaran, Karthikeyan

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CiteExportLink to record
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Citation style
  • apa
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  • Other locale
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Output format
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  • asciidoc
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