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Updated: May 26, 2026

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults

Published on: February 12, 2020

Vertical vergence adaptation does improve with practice.

Nisha Patel¹, Alison Y Firth

¹University of Sheffield, Academic Unit of Ophthalmology and Orthopedics, Royal Hallamshire Hospital, United Kingdom.

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|April 15, 2003

Summary

This summary is machine-generated.

Repeatedly testing vertical prism adaptation in individuals with normal binocular vision revealed a significant practice effect. This suggests that repeated exposure improves the visual system's ability to adapt to prismatic challenges.

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Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Binocular vision relies on the precise alignment of the eyes.
Prisms are used in vision therapy to correct or adapt to visual misalignment.
Adaptation to prisms can be influenced by various factors, including testing protocols.

Purpose of the Study:

To determine if repeated testing influences adaptation to a 2 Delta vertical prism.
To assess the impact of practice on vertical vergence adaptation in subjects with normal binocular vision.

Main Methods:

Eight young adults with normal binocular vision participated.
A 2 Delta vertical prism was used, with adaptation measured via residual deviation using a modified Maddox Rod technique.
Measurements were repeated 10 times with 5-minute rest intervals between trials.

Main Results:

A statistically significant reduction in mean residual deviation was observed with consecutive trials (p < 0.0001).
No significant correlation was found between vertical vergence amplitude and the degree of adaptation improvement.

Conclusions:

A practice effect exists for vertical vergence adaptation in young adults with normal binocular vision.
Repeated exposure to vertical prism challenges enhances adaptation.