Estimating visual acuity from a single wavefront measurement

Nankivil, Derek; Raymond, T. D.; Hofmann, Greg; Neal, Daniel R.

doi:10.1117/12.2548645

Cited by 3 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ocular aberrations' wavefront provides an excellent description of the eye's optical quality; however, a direct conversion to VA is not directly interpretable from the wavefront alone. Nankivil et al 50 showed that, although MTF alone is sufficient to predict population mean VA (in their study, across all measurements, predicted differed from measured [at 4 m] uncorrected VA by +0.01 and best corrected VA by −0.16), it was not sufficient to predict an individual's VA well. Instead, additional factors such as age and spherocylindrical refraction were needed to accurately predict an individual subject's VA, supporting the notion that other factors need to be considered to obtain more accurate estimates of VA.…”

Section: Discussionmentioning

confidence: 70%

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Viñas

Aissati

Gonzalez-Ramos

et al. 2020

Trans. Vis. Sci. Tech.

Self Cite

View full text Add to dashboard Cite

As multifocal contact lenses (MCLs) expand as a solution for presbyopia correction, a better understanding of their optical and visual performance becomes essential. Also, providing subjects with the experience of multifocal vision before contact lens fitting becomes critical, both to systematically test different multifocal designs and to optimize selection in the clinic. In this study, we evaluated the ability of a simultaneous vision visual simulator (SimVis) to represent MCLs. Methods: Through focus (TF) optical and visual quality with a center-near aspheric MCL (low, medium and high near adds) were measured using a multichannel polychromatic Adaptive Optics visual simulator equipped with double-pass, SimVis (temporal multiplexing), and psychophysical channels to allow measurements on-bench and in vivo. On bench TF optical quality of SimVis-simulated MCLs was obtained from double-pass (DP) images and images of an E-stimulus using artificial eyes. Ten presbyopic subjects were fitted with the MCL. Visual acuity (VA) and DP retinal images were measured TF in a 4.00 D range with the MCL on eye, and through SimVis simulations of the same MCLs on the same subjects. Results: TF optical (on bench and in vivo) and visual (in vivo) quality measurements captured the expected broadening of the curves with increasing add. Root mean square difference between real and SimVis-simulated lens was 0.031/0.025 (low add), 0.025/0.015 (medium add), 0.019/0.011 (high add), for TF DP and TF LogMAR VA, respectively. A shape similarity metric shows high statistical values (lag κ = 0), rho = 0.811/0.895 (low add), 0.792/0.944 (medium add), and 0.861/0.915 (high add) for TF DP/LogMAR VA, respectively. Conclusions: MCLs theoretically and effectively expand the depth of focus. A novel simulator, SimVis, captured the through-focus optical and visual performance of the MCL in most of the subjects. Visual simulators allow subjects to experience vision with multifocal lenses prior to testing them on-eye. Translational Relevance: Simultaneous visual simulators allow subjects to experience multifocal vision non-invasively. We demonstrated equivalency between real multifocal contact lenses and SimVis-simulated lenses. The results suggest that SimVis is a suitable technique to aid selection of presbyopic corrections in the contactology practice.

show abstract

Section: Discussionmentioning

confidence: 70%

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Viñas

Aissati

Gonzalez-Ramos

et al. 2020

Trans. Vis. Sci. Tech.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Entrance pupil diameter was set to 4.0 mm for this calculation. The PSF was computed using a Fourier method [ 21 ]. PSFs were generated every 20 nm from 380 nm to 760 nm (19 PSFs per eye model) for each of the 18 monochromatic eye models with each of 7 LCA and 7 TCA models described above, giving a total of 18 × 7x7 = 882 polychromatic eye models (each described by 19 PSFs spanning the visible spectrum in 20 nm steps).…”

Section: Methodsmentioning

confidence: 99%

Theoretical impact of chromatic aberration correction on visual acuity

Nankivil,

Cottaris,

Brainard

2024

Biomed. Opt. Express

View full text Add to dashboard Cite

It has been known for more than 220 years that the image quality of the human eye is significantly degraded by chromatic aberrations. Recently, it was shown experimentally that correcting chromatic aberrations results in a 0.2- to 0.8-line improvement in visual acuity. Here we ask, is this expected? We developed tools that enable simulations of the optical impact of physiologically relevant amounts of chromatic aberration in real human eyes and combined these with tools that compute the visual acuity of an ideal observer. This allows us to characterize the theoretical impact of chromatic aberration correction on visual acuity. Results indicate a substantive improvement of 0.4- to 2-lines in ideal observer visual acuity with chromatic aberration correction. Ideal observer thresholds benefit significantly more from correction of longitudinal than correction of transverse chromatic aberration. Finally, improvements in ideal observer visual acuity are greater for subjects with less monochromatic aberration, such that subjects with better baseline optical quality benefit most from correction of chromatic aberrations.

show abstract

“…Entrance pupil diameter was set to 4.0 mm. The PSF and MTF were computed using a Fourier method ( Nankivil, Raymond, Hofmann, & Neal, 2020 ). Wavefront estimates for each of the selected wavelengths were obtained assuming three levels of LCA ((0, 0), (−0.998, +0.280), (−2.554, +1.036) D at

= 400, 700 nm) and three levels of TCA ((0, 0), (0.4, 0.2), and (6.3, 3.1) arcmin in the horizontal and vertical meridians from

= 400–700 nm).…”

Section: Figure A11mentioning

confidence: 99%

The visual benefits of correcting longitudinal and transverse chromatic aberration

et al. 2023

Self Cite

View full text Add to dashboard Cite

We describe a system—the Binocular Varichrome and Accommodation Measurement System—that can be used to measure and correct the eye’s longitudinal and transverse chromatic aberration (LCA and TCA) and to perform vision tests with custom corrections. We used the system to investigate how LCA and TCA affect visual performance. Specifically, we studied the effects of LCA and TCA on visual acuity, contrast sensitivity, and chromostereopsis. LCA exhibited inter subject variability but followed expected trends compared with previous reports. TCA at the fovea was variable between individuals but with a tendency for the shift at shorter wavelengths to be more temporalward in the visual field in each eye. We found that TCA was generally greater when LCA was corrected. For visual acuity, we found that a measurable benefit was realized only with both LCA and TCA correction unless the TCA was low. For contrast sensitivity, we found that the best sensitivity to a 10-cycle/degree polychromatic grating was attained when LCA and TCA were corrected. Finally, we found that the primary cause of chromostereopsis is the TCA of the eyes.

show abstract

Estimating visual acuity from a single wavefront measurement

Cited by 3 publications

References 7 publications

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Optical and Visual Quality With Physical and Visually Simulated Presbyopic Multifocal Contact Lenses

Theoretical impact of chromatic aberration correction on visual acuity

The visual benefits of correcting longitudinal and transverse chromatic aberration

Contact Info

Product

Resources

About