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Differences in tests of aniseikonia.

G McCormack¹, E Peli, P Stone

¹New England College of Optometry, Boston, MA 02115.

Investigative Ophthalmology & Visual Science

|May 1, 1992

Summary

The New Aniseikonia Test (NAT) inaccurately measures aniseikonia, underestimating its severity in clinical and induced cases. This hand-held screening tool is not a valid method for assessing aniseikonia.

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Area of Science:

Ophthalmology
Vision Science
Optometry

Background:

Aniseikonia, a visual perception issue, requires accurate measurement for effective management.
Hand-held screening tests offer potential advantages for widespread aniseikonia detection.
The New Aniseikonia Test (NAT) utilizes red/green anaglyphs for direct comparison.

Purpose of the Study:

To evaluate the validity of the New Aniseikonia Test (NAT) compared to the Space Eikonometer.
To determine if the NAT accurately measures induced and habitual aniseikonia.

Main Methods:

Compared NAT and Space Eikonometer in 15 normal subjects with induced aniseikonia using size lenses.
Measured habitual aniseikonia in four patients using both instruments.
Retested eight normal subjects with a computer-video simulation of the NAT.

Main Results:

The NAT underestimated induced aniseikonia by a factor of 3 in normal subjects.
The NAT also underestimated habitual aniseikonia in four patients.
The Space Eikonometer accurately measured induced aniseikonia; NAT simulation did not show underestimation.

Conclusions:

The New Aniseikonia Test (NAT) is not a valid measure of aniseikonia.
The NAT's underestimation may stem from altered sensory fusion responses.
Further research is needed to understand the NAT's measurement discrepancies.

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