Influence of Test Distance on Stereoacuity in Intermittent Exotropia

Aims: To investigate influence of test distance on stereoacuity in intermittent exotropia (X[T]) using the same test conditions for both near and far distances. Methods: Subjects were 38 consecutive patients with X(T). All the patients were between ages 6 and 15 years and had decimal visual acuity o...

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Bibliographic Details
Published in:Strabismus 2017-01, Vol.25 (1), p.12-16
Main Authors: Seki, Yukari, Wakayama, Akemi, Takahashi, Rika, Umebara, Ikumi, Tanabe, Fumi, Abe, Kosuke, Shimomura, Yoshikazu
Format: Article
Language:English
Subjects:
Adolescent
Child
Depth Perception - physiology
Exotropia - physiopathology
Eyeglasses
far stereoacuity
Female
Humans
intermittent exotropia
Male
near stereoacuity
Prospective Studies
stereoacuity
test distance
Vision Disparity - physiology
Vision Tests - methods
Vision, Binocular - physiology
Visual Acuity - physiology
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Summary:Aims: To investigate influence of test distance on stereoacuity in intermittent exotropia (X[T]) using the same test conditions for both near and far distances. Methods: Subjects were 38 consecutive patients with X(T). All the patients were between ages 6 and 15 years and had decimal visual acuity of 1.0 or better. Another inclusion criterion was presence of phoric condition at near and far distances. Stereoacuity was measured at a near distance of 40 cm and at a far distance of 5 m. The following test conditions were used for both test distances: separation of the two eyes using polarized glasses, and a target with a random dot pattern. All the stereograms had the same subtended angle of 2.5º, and binocular disparity of 480, 240, 120, and 60 arcsec. We used two stereogram types with crossed and uncrossed disparities. Results: Far stereoacuity of 38 subjects measured with the crossed disparity was significantly worse than near stereoacuity (P
ISSN:0927-3972
1744-5132
DOI:10.1080/09273972.2016.1276938