Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30306
Title: Crossed and uncrossed stereoacuity at distance and the effect from heterophoria
Authors: Lam, AKC 
Tse, P
Choy, E
Chung, M
Keywords: Crossed stereoacuity
Heterophoria
Three-rod test
Uncrossed stereoacuity
Issue Date: 2002
Publisher: Wiley-Blackwell
Source: Ophthalmic and physiological optics, 2002, v. 22, no. 3, p. 189-193 How to cite?
Journal: Ophthalmic and physiological optics 
Abstract: Background: Previous studies have found that crossed disparities give better stereoacuity than uncrossed. When near phoria is considered, exophores had a better crossed stereoacuity and esophores had a better uncrossed stereoacuity. The current study investigated the effect of heterophoria on distant crossed and uncrossed stereoacuity. Methods: Seventy-two subjects were recruited and their distant heterophoria measured. Heterophoria within two prism dioptres was considered as orthophoric. Esophoric group had esophoria greater than two prism dioptres. Exophoric group had exophoria greater than two prism dioptres. There were 40 orthophores, 23 exophores and nine esophores. Their stereoacuity was measured with a three-rod apparatus at 6 m. Results: The mean crossed stereoacuity was 4.8″ and uncrossed stereoacuity was 7.2″ (t = -3.03, p < 0.01). The mean stereoacuity for orthophoric subjects was 5.31″, 6.02″ for exophores and 8.91″ for esophores. The distant crossed stereoacuity is better than uncrossed stereoacuity in all three groups but the difference is only significant for the exophores. Exophoric subjects demonstrated a significant difference between crossed (4.10″) and uncrossed (7.95″) stereoacuity. Conclusions: Orthophores have the best stereoacuity, followed by exophores and esophores. Exophoric subjects have a better crossed than uncrossed stereoacuity. More esophoric subjects should be recruited to confirm the difference between crossed and uncrossed stereoacuity.
URI: http://hdl.handle.net/10397/30306
ISSN: 0275-5408
EISSN: 1475-1313
DOI: 10.1046/j.1475-1313.2002.00030.x
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