New Objective Refraction Metric Based on Sphere Fitting to the Wavefront
Purpose. To develop an objective refraction formula based on the ocular wavefront error (WFE) expressed in terms of Zernike coefficients and pupil radius, which would be an accurate predictor of subjective spherical equivalent (SE) for different pupil sizes. Methods. A sphere is fitted to the ocular...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Journal of Ophthalmology |
| Online Access: | http://dx.doi.org/10.1155/2017/1909348 |
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| author | Mateusz Jaskulski Andreí Martínez-Finkelshtein Norberto López-Gil |
| author_facet | Mateusz Jaskulski Andreí Martínez-Finkelshtein Norberto López-Gil |
| author_sort | Mateusz Jaskulski |
| collection | DOAJ |
| description | Purpose. To develop an objective refraction formula based on the ocular wavefront error (WFE) expressed in terms of Zernike coefficients and pupil radius, which would be an accurate predictor of subjective spherical equivalent (SE) for different pupil sizes. Methods. A sphere is fitted to the ocular wavefront at the center and at a variable distance, t. The optimal fitting distance, topt, is obtained empirically from a dataset of 308 eyes as a function of objective refraction pupil radius, r0, and used to define the formula of a new wavefront refraction metric (MTR). The metric is tested in another, independent dataset of 200 eyes. Results. For pupil radii r0≤2 mm, the new metric predicts the equivalent sphere with similar accuracy (<0.1D), however, for r0>2 mm, the mean error of traditional metrics can increase beyond 0.25D, and the MTR remains accurate. The proposed metric allows clinicians to obtain an accurate clinical spherical equivalent value without rescaling/refitting of the wavefront coefficients. It has the potential to be developed into a metric which will be able to predict full spherocylindrical refraction for the desired illumination conditions and corresponding pupil size. |
| format | Article |
| id | doaj-art-f4bda1e77ae24e388b7dbc898db93f99 |
| institution | Kabale University |
| issn | 2090-004X 2090-0058 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Ophthalmology |
| spelling | doaj-art-f4bda1e77ae24e388b7dbc898db93f992025-02-03T06:12:18ZengWileyJournal of Ophthalmology2090-004X2090-00582017-01-01201710.1155/2017/19093481909348New Objective Refraction Metric Based on Sphere Fitting to the WavefrontMateusz Jaskulski0Andreí Martínez-Finkelshtein1Norberto López-Gil2Facultad de Óptica y Optometría, University of Murcia, Murcia, SpainDepartment of Mathematics, University of Almería, Almería, SpainFacultad de Óptica y Optometría, University of Murcia, Murcia, SpainPurpose. To develop an objective refraction formula based on the ocular wavefront error (WFE) expressed in terms of Zernike coefficients and pupil radius, which would be an accurate predictor of subjective spherical equivalent (SE) for different pupil sizes. Methods. A sphere is fitted to the ocular wavefront at the center and at a variable distance, t. The optimal fitting distance, topt, is obtained empirically from a dataset of 308 eyes as a function of objective refraction pupil radius, r0, and used to define the formula of a new wavefront refraction metric (MTR). The metric is tested in another, independent dataset of 200 eyes. Results. For pupil radii r0≤2 mm, the new metric predicts the equivalent sphere with similar accuracy (<0.1D), however, for r0>2 mm, the mean error of traditional metrics can increase beyond 0.25D, and the MTR remains accurate. The proposed metric allows clinicians to obtain an accurate clinical spherical equivalent value without rescaling/refitting of the wavefront coefficients. It has the potential to be developed into a metric which will be able to predict full spherocylindrical refraction for the desired illumination conditions and corresponding pupil size.http://dx.doi.org/10.1155/2017/1909348 |
| spellingShingle | Mateusz Jaskulski Andreí Martínez-Finkelshtein Norberto López-Gil New Objective Refraction Metric Based on Sphere Fitting to the Wavefront Journal of Ophthalmology |
| title | New Objective Refraction Metric Based on Sphere Fitting to the Wavefront |
| title_full | New Objective Refraction Metric Based on Sphere Fitting to the Wavefront |
| title_fullStr | New Objective Refraction Metric Based on Sphere Fitting to the Wavefront |
| title_full_unstemmed | New Objective Refraction Metric Based on Sphere Fitting to the Wavefront |
| title_short | New Objective Refraction Metric Based on Sphere Fitting to the Wavefront |
| title_sort | new objective refraction metric based on sphere fitting to the wavefront |
| url | http://dx.doi.org/10.1155/2017/1909348 |
| work_keys_str_mv | AT mateuszjaskulski newobjectiverefractionmetricbasedonspherefittingtothewavefront AT andreimartinezfinkelshtein newobjectiverefractionmetricbasedonspherefittingtothewavefront AT norbertolopezgil newobjectiverefractionmetricbasedonspherefittingtothewavefront |