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Related Experiment Video

Updated: Jul 17, 2026

The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish

The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish

Published on: October 9, 2013

Infants' acuity at twenty feet.

E H Cornell, P M McDonnell

Investigative Ophthalmology & Visual Science

|September 1, 1986

Summary

This study measured infant visual acuity using fixation duration to detect the smallest stripe width. Results confirm previous findings and provide a more confident Snellen notation estimate at a 20-ft distance.

Area of Science:

Developmental psychology
Pediatric ophthalmology
Visual neuroscience

Background:

Infant visual acuity development is crucial for cognitive and motor skill acquisition.
Previous studies on infant visual acuity often used shorter viewing distances, potentially limiting real-world applicability.
Accurate measurement of visual acuity in infants is challenging due to their limited communicative abilities.

Purpose of the Study:

To assess the visual acuity of infants aged 6 to 36 weeks.
To determine if a longer viewing distance (20 ft) affects the measurement of infant visual acuity.
To provide a more confident estimation of infant visual acuity in Snellen notation.

Main Methods:

Utilized the duration of fixation paradigm to measure visual discrimination.

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Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

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Last Updated: Jul 17, 2026

The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish

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Published on: October 9, 2013

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

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Infants were presented with black-and-white square-wave gratings and a homogeneous gray field.

Visual acuity was defined as the smallest stripe width fixated longer than the gray field by at least 18 of 24 infants.

Main Results:

The study successfully estimated visual acuity across different infant age groups (6, 12, 24, and 36 weeks).
Results are consistent with prior acuity estimates obtained at shorter viewing distances (< 5 ft).
The 20-ft viewing distance allowed for a more confident estimation of visual acuity in Snellen notation.

Conclusions:

Fixation duration is a reliable method for assessing infant visual acuity at extended distances.
The findings support the developmental trajectory of visual acuity in early infancy.
This study enhances the ability to confidently quantify infant visual acuity using standard notation.