Worth 4 Dot App for Determining Size and Depth of Suppression

Area of Science:

• Ophthalmology
• Vision Science
• Computational Vision

Background:

• Suppression is a key factor in binocular vision disorders.
• Accurate measurement of suppression is crucial for diagnosis and treatment.
• Existing methods for assessing suppression can be cumbersome or lack precision.

Purpose of the Study:

• To introduce and evaluate the Worth 4 Dot App (W4DApp), an iOS application designed to measure the size and depth of visual suppression.
• To compare the W4DApp's performance against established clinical methods for evaluating sensory fusion and suppression.

Main Methods:

• The W4DApp was tested on 25 participants with normal and abnormal binocular vision.
• Suppression zone size and fusion classification were determined using W4DApp and a traditional flashlight Worth 4 Dot test.
• Suppression depth was compared between W4DApp, the flashlight Worth 4 Dot test with neutral density filters, and a contrast balance index test.

Main Results:

• High agreement was found between W4DApp and the flashlight Worth 4 Dot test for fusion classification (α = 0.817).
• W4DApp demonstrated comparable success rates and reliability to the flashlight Worth 4 Dot test for measuring suppression zone size.
• W4DApp showed significantly higher success rates and reliability for suppression depth measures, though correlation with other methods was not significant.

Conclusions:

• The W4DApp shows promise as a clinical tool for assessing suppression zone size in binocular vision.
• Further modifications to the W4DApp are necessary to enhance the validity of its suppression depth measurements.