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Related Concept Videos

Focusing of Light in the Eye01:16

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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Related Experiment Video

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Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

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

Published on: September 16, 2025

Changes in ocular wavefront aberrations and retinal image quality with objective accommodation.

Ying-Jun Li1, Jin A Choi, Hyojin Kim

  • 1Laboratory of Ophthalmology and Visual Science, Korean Eye Tissue and Gene Bank Related to Blindness, St. Vincent Hospital, Seoul, Korea.

Journal of Cataract and Refractive Surgery
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

Objective accommodation alters ocular wavefront aberrations and retinal image quality in normal eyes. Spherical aberrations significantly change with accommodation, impacting visual performance.

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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

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Last Updated: Jun 3, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

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

Published on: September 16, 2025

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
08:27

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accommodation is the eye's ability to change focus.
  • Understanding how accommodation affects ocular optics is crucial for vision correction.

Purpose of the Study:

  • To evaluate changes in ocular wavefront aberrations and retinal image quality during objective accommodation in healthy human eyes.

Main Methods:

  • A cohort study measured wavefront aberrations using an iTrace aberrometer in emmetropic eyes at far and near fixation distances.
  • Wavefront data were analyzed for 3.0 mm and 5.0 mm pupil sizes.
  • Retinal image quality was simulated using modulation transfer function (MTF) calculations from aberration data.

Main Results:

  • Significant differences in total higher-order aberrations (HOAs) were observed before and after accommodation (5.0 mm pupil, P=.021).
  • Total spherical aberrations became more negative with accommodation (3.0 mm and 5.0 mm pupils, P<.001).
  • Modulation transfer function curves showed significant differences post-accommodation at 5 and 10 cycles per degree (5.0 mm pupil, P=.031 and P=.045).

Conclusions:

  • Ocular wavefront aberrations and retinal image quality demonstrably change with accommodation in normal human eyes.
  • Total spherical aberration exhibits the most significant change among higher-order aberrations during accommodation.