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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Published on: July 21, 2020

Pupil shape as viewed along the horizontal visual field.

Ankit Mathur1, Julia Gehrmann, David A Atchison

  • 1Institute of Health & Biomedical Innovation and School of Optometry & Vision Science, Queensland University of Technology, Brisbane, Australia.

Journal of Vision
|May 8, 2013
PubMed
Summary

Pupil shape changes across the visual field follow a cosine pattern, influenced by refractive error. This model helps understand peripheral vision and optical quality in the eye.

Keywords:
peripheral visionpupil shape

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Vision Science

Background:

  • Pupil size and shape significantly impact peripheral image quality by altering optical aberrations and light transmission.
  • Understanding off-axis pupil dynamics is crucial for accurate modeling of visual perception and optical performance.

Purpose of the Study:

  • To model the pattern of pupil shape across the entire horizontal visual field.
  • To investigate the influence of refractive error on these pupil shape patterns.

Main Methods:

  • Pupil images were captured from 30 participants' right eyes using a modified aberrometer along the horizontal visual field (±90°).
  • A two-lens relay system facilitated fixation at a 3m distance, with eye rotations limited to under 30°.
  • Best-fit elliptical pupil dimensions were determined, and axis diameter ratios were plotted against visual field angle.

Main Results:

  • Pupil shape changes were accurately modeled by cosine functions, with peaks in the temporal visual field (-1° to -9°).
  • The observed pupil shape was consistently flatter (9-15% wider than predicted by cosine function).
  • Increased myopia led to a less temporal peak and a smaller pupil width, indicating refractive error influence.

Conclusions:

  • Off-axis pupil shape changes are well-described by a decentered and flatter cosine function.
  • Refractive error has a minor but discernible influence on these off-axis pupil shape dynamics.
  • This model provides insights into how pupil shape variations affect peripheral vision and optical quality.