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Updated: May 26, 2026
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
Design and validation of a method for evaluation of interocular interaction
Xin Jie Angela Lai1, Jack Alexander, Arthur Ho
1The School of Optometry and Vision Science, The University of New South Wales, Sydney, New South Wales, Australia.
Summary
A new Trial Frame Apparatus (TFA) allows dichoptic masking studies. This simple system showed good repeatability and acceptable agreement with existing devices for visual function testing in adults and children.
Area of Science:
- Ophthalmology
- Visual Neuroscience
- Psychophysics
Background:
- Dichoptic masking is crucial for understanding interocular interactions.
- Existing methods for dichoptic masking, like shutter goggles, can be complex and less suitable for certain populations.
Purpose of the Study:
- To design and validate a simple viewing system, the Trial Frame Apparatus (TFA), for dichoptic masking.
- To assess the TFA's efficacy in adults and children with normal vision.
Main Methods:
- The TFA utilizes a trial frame with a pinhole and an occluder for dichoptic viewing.
- Experiment 1 optimized the occluder type for measuring the Interaction Index.
- Experiment 2 compared TFA measurements (acuity, contrast, alignment sensitivity) against shutter goggles in adults and children, assessing repeatability and agreement.
Main Results:
- The TFA demonstrated high repeatability for all visual function measurements across all age groups.
- While contrast sensitivity was lower with TFA compared to goggles, the Interaction Index showed acceptable agreement between the two methods.
Conclusions:
- The Trial Frame Apparatus (TFA) offers a viable and simple alternative for studying dichoptic masking.
- The TFA is particularly useful in populations where more complex equipment is impractical.
