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Related Experiment Video

Updated: Jul 16, 2026

The Measurement and Treatment of Suppression in Amblyopia

The Measurement and Treatment of Suppression in Amblyopia

Published on: December 14, 2012

Prehension deficits in amblyopia.

Simon Grant¹, Dean R Melmoth, Michael J Morgan

¹Department of Optometry and Visual Science, The Henry Wellcome Laboratories for Visual Sciences, City University, London, United Kingdom.

Investigative Ophthalmology & Visual Science

|February 28, 2007

Summary

Adults with amblyopia (lazy eye) show normal initial reaching but deficits in final hand movements and grasping. These visuomotor impairments worsen with amblyopia severity, impacting everyday tasks.

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Last Updated: Jul 16, 2026

The Measurement and Treatment of Suppression in Amblyopia

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Published on: December 14, 2012

Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading

Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading

Published on: October 18, 2018

Area of Science:

Neuroscience
Ophthalmology
Human Motor Control

Background:

Amblyopia, or lazy eye, is a developmental disorder affecting visual acuity and depth perception.
While visual defects in amblyopia are known, their impact on visuomotor tasks like prehension is not well understood.

Purpose of the Study:

To evaluate and compare eye-hand coordination (prehension) skills in adult amblyopes versus normal subjects.
To investigate how visual acuity loss and stereodeficiency in amblyopia affect prehension performance.

Main Methods:

Twenty adult amblyopes and 20 matched controls performed reaching, grasping, and lifting tasks with household objects.
Hand movements were recorded under binocular, dominant eye, and amblyopic eye viewing conditions.
Quantified indices of prehension planning and online control for 48 trials per condition.

Main Results:

Amblyopic subjects demonstrated relatively normal initial reaching and grip shaping.
Deficits were observed in the terminal reach, grasp closure, and application of force, particularly under nondominant eye and binocular conditions.
Impairments, including prolonged execution times and increased errors, correlated with amblyopia severity.

Conclusions:

Visuomotor adaptations in amblyopia are minor, primarily affecting movement execution rather than planning.
Treatment strategies aiming to restore spatial acuity and binocularity may improve visuomotor deficits in amblyopes.
These findings highlight the need to consider visuomotor function in assessing therapeutic outcomes for amblyopia.