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Related Experiment Video

Updated: Jan 12, 2026

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

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

Published on: March 17, 2023

Developing age-reference values for convergence and visual attention assessments.

Nicola Gavin¹, Lauren R Hepworth², Fiona J Rowe²

¹Department of Orthoptics, Warrington and Halton Hospitals NHS Trust, Warrington, UK.

|November 6, 2025

Summary

This summary is machine-generated.

This study establishes normative values for near point of convergence and visual inattention tasks in healthy older adults. These findings provide crucial benchmarks for clinical assessments in aging populations.

Keywords:

Acquired brain injury cancellation convergence dominance handedness line bisection normative values stroke

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Last Updated: Jan 12, 2026

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A Method to Quantify Visual Information Processing in Children Using Eye Tracking

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

Published on: July 9, 2016

Area of Science:

Ophthalmology
Neuroscience
Gerontology

Background:

Lack of established definitions and cutoff values for impaired near point of convergence (NPC) and visual inattention tasks in older adults.
Need for normative data in a non-clinical population with healthy eyes and cognition.

Purpose of the Study:

To investigate measurements, response times, and accuracy for NPC and visual inattention tasks in adults over 50 years.
To establish normative ranges for future clinical comparisons.

Main Methods:

Prospective cross-sectional study of 240 adults aged 50+ with healthy eyes and cognition.
Recorded average of three NPC measurements.
Assessed accuracy and speed of line bisection and clock cancellation tasks using dominant and non-dominant hands.

Main Results:

Mean NPC was 9.22 cm, decreasing slightly with age.
Established error cutoff for line bisection at 6 mm, with better accuracy on the 10-line task.
Determined error cutoff for clock cancellation at 42, with a mean completion time of 1.5 minutes.

Conclusions:

Reported normative ranges for older adults (>50 years) for NPC and visual inattention.
These ranges can be used for clinical comparisons.
Further research is needed for acquired brain injury populations.