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:: Volume 24, Issue 1 (Iranian Journal of Ophthalmology 2012) ::
2012, 24(1): 25-30 Back to browse issues page
Effect of Induced Heterophoria on Distance Stereoacuity by using the Howard-Dolman Test
Javad Heravian Dr., Seyyed Hosein Hoseini Yazdi * , Akram Ehyaei , Fatemeh Baghebani , Monireh Mahjoob , Hadi Ostadimoghaddam Dr., AbbasAli Yekta Dr., Abbas Azimi Dr.
, opt.hoseini@gmail.com
Abstract:   (10087 Views)

Purpose : To evaluate the effect of induced esophoria and exophoria on distance stereoacuity at 6 meters

Methods : Fifty subjects with distance corrected or uncorrected visual acuity of 6/6 and orthophoria without history of amblyopia, strabismus or any ocular pathology were recruited and distance stereoacuity was measured by Howard-dolman test before and after introducing 2, 4, 6 and 8Δ base in and base out to induce esophoria and exophoria, respectively.

Results : Although the decrease in stereoacuity was not significant by introducing 2Δ base in prism (P=0.062), but it was significant statistically by introducing 4 and 6Δ base in (P=0.002, P=0.026, respectively) and 2, 4, 6, 8Δ base out (P=0.042, P<0.001, P<0.001, P<0.001, respectively) prisms compared with orthophoric position. There was no significant difference between stereoacuity in 2Δ and 4Δ induced esophoria with 2Δ and 4Δ induced exophoria (P=0.696, P=0.677, respectively), but 6Δ induced esophoria decreased stereoacuity more than induced exophoria of the same amount (P=0.007).

Conclusion : Induced heterophoria at distance of 6 meters reduced stereoacuity measured by modified Howard-Dolman test. Greater than 4Δ of induced esophoria had statically and clinically adverse effect on distance stereoacuity.


Iranian Journal of Ophthalmology 201224(1):25-30 © 2012 by the Iranian Society of Ophthalmology
Keywords: Stereoacuity, Heterophoria, Howard-Dolman Test
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Type of Study: Original | Subject: General
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Heravian J, Hoseini Yazdi S H, Ehyaei A, Baghebani F, Mahjoob M, Ostadimoghaddam H, et al . Effect of Induced Heterophoria on Distance Stereoacuity by using the Howard-Dolman Test. Iranian Journal of Ophthalmology. 2012; 24 (1) :25-30
URL: http://irjo.org/article-1-598-en.html

Volume 24, Issue 1 (Iranian Journal of Ophthalmology 2012) Back to browse issues page
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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