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Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Related Experiment Video

Updated: Jun 2, 2026

Assessing Pupil-linked Changes in Locus Coeruleus-mediated Arousal Elicited by Trigeminal Stimulation

Assessing Pupil-linked Changes in Locus Coeruleus-mediated Arousal Elicited by Trigeminal Stimulation

Published on: November 26, 2019

Pupil responses to near visual demand during human visual development.

Shrikant R Bharadwaj¹, Jingyun Wang, T Rowan Candy

¹Hyderabad Eye Research Foundation, Bausch and Lomb School of Optometry, L V Prasad Eye Institute, Hyderabad, Andhra Pradesh, India. bharadwaj@lvpei.org

Journal of Vision

|April 13, 2011

Summary

Pupil responses to visual tasks are less developed in infants and children than adults. This difference highlights how binocular cues are crucial for near vision during development.

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Last Updated: Jun 2, 2026

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Published on: November 26, 2019

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An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Published on: March 17, 2023

Area of Science:

Ophthalmology
Developmental Neuroscience
Visual Optics

Background:

Pupil responses to visual stimuli are well-documented in adults but not in developing children.
Understanding these responses in infants and children is crucial for characterizing visual development.

Purpose of the Study:

To determine pupil response characteristics in infants, children, and adults.
To compare binocular and monocular pupil responses across different age groups and visual demands.
To investigate the response threshold and stability of pupil dynamics.

Main Methods:

Utilized a PowerRefractor (25 Hz) to measure pupil responses.
Assessed responses to a cartoon movie with changing viewing distances (80 to 33 cm).
Measured responses to sinusoidal stimuli of varying amplitudes (0.25 D, 0.5 D, 0.75 D) and assessed steady-state stability.

Main Results:

The change in pupil diameter with viewing distance (Δpd) was significantly smaller in infants and young children compared to adults.
Monocular responses were significantly smaller than binocular responses across all age groups.
A 0.75 D stimulus elicited significant responses in infants (binocular) and adults (binocular and monocular).
Steady-state pupillary fluctuations were comparable between infants and adults.

Conclusions:

The contribution of pupil size to retinal image quality during visual tracking is likely smaller in developing individuals than in adults.
Smaller monocular pupil diameter changes indicate the significant role of binocular cues in driving near-pupillary responses during development.