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Focusing of Light in the Eye

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

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Polychromatic refractive error from monochromatic wavefront aberrometry.

Charles Coe¹, Arthur Bradley, Larry Thibos

¹*OD, PhD †PhD ‡PhD, FAAO Indiana University School of Optometry, Bloomington, Indiana (all authors).

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|August 9, 2014

Summary

This summary is machine-generated.

Objective measurement of monochromatic wavefront aberrations in near-infrared light can accurately predict subjective refractive error for polychromatic light. Intersubject variability, however, can limit individual accuracy.

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Bringing the Visible Universe into Focus with Robo-AO

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Published on: February 12, 2013

Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Accurate refractive error assessment is crucial for vision correction.
Monochromatic wavefront aberrations offer a potential objective measure of refractive error.
Chromatic aberration in the eye influences the relationship between monochromatic and polychromatic focus.

Purpose of the Study:

To evaluate the accuracy and precision of predicting polychromatic refractive error using monochromatic wavefront aberrations measured in near-infrared light.
To determine the monochromatic wavelength-in-focus (WiF) for individual eyes and its role in prediction.
To report new empirical measurements of WiF.

Main Methods:

Subjective refractive error was measured across wavelengths with paralyzed accommodation using a Badal optometer.
Wavelength-in-focus (WiF) was determined by interpolation.
Monochromatic (842 nm) wavefront aberrations were measured and used with the Indiana Eye model of chromatic aberration to predict refractive error.

Main Results:

Average WiF was 569 nm (3-mm pupil) and 575 nm (8-mm pupil).
Prediction error for white light was 0.20 D (3-mm pupil) and 0.004 D (large pupils).
Prediction error was not statistically different from zero for large pupils but slightly hyperopic for small pupils.

Conclusions:

Objective prediction of subjective refractive error for white light from monochromatic wavefront aberrations in near-infrared light is feasible.
Accuracy and precision are high, especially for larger pupils.
Intersubject variability in WiF can limit the accuracy of individual refractive error prediction.