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Paper Information

Journal:   BINA   SPRING 2011 , Volume 16 , Number 3 (64); Page(s) 220 To 225.
 
Paper: 

THE EFFECT OF OCULAR DOMINANCE ON STEREO ACUITY IN EXPERIMENTALLY INDUCED ANISOMETROPIA

 
 
Author(s):  NABIE R.*, ANDALIB D., SADEGHI H., AMIRASLANZADEH S., KHOJASTEH H., SOLTANMOHAMMADLOU F., SABOORI R.
 
* TABRIZ UNIVERSITY OF MEDICAL SCIENCES, TABRIZ, IRAN
 
Abstract: 
Purpose: To evaluate the effect of ocular dominance on stereoacuity in experimentally induced anisometropia.
Methods: In this clinical trial, 60 healthy adult volunteers 18-37 years of age (mean age: 25.58 years) without any ocular disease were emolled at Tabriz Nikookari eye hospital over a one-year period. Anisometropia (unilateral myopia) was induced by placing trial lenses over the dominant and non-dominant eyes in 1 diopter (D) increments ranging from 1-3 D. Stereoacuity was measured using the TNO, Randot and Titmus stereotests and values were converted into Neperian logarithm (In) and compared between the two eyes.
Results: Of sixty adults including, 25 male and 35 female subjects, the right eye was dominant in 49 (81.7%) of cases. Stereoacuity levels were reduced proportionate to the degree of anisometropia in all participants.
Mean stereoacuity was 4.3, 5.5 and 7.4 In for dominant eyes and 4.1, 5.4 and 7.3 In for non dominant eyes usig the TNO test by applying 1, 2 and 3 D lenses, respectively (P>0.05). Corresponding values were 3.5, 4.6 and 6.6 In for dominant eyes and 3.4, 4.6 and 6.5 In for non dominant eyes by the circles subcategory of Randot test, respectively (P>0.05). The scores were 3.8, 4.7 and 6.5 In for dominant eyes and 3.8, 4.7 and 6.4 In for non dominant eyes by the circles subcategory of Titmus test, respectively (P>0.05).
Conclusion: Experimentally induced anisometropia could reduce stereoacuity. However, ocular dominance has no effect on the amount of stereoacuity reduction.
 
Keyword(s): EXOTROPIA, HANG-BACK TECHNIQUE, RECESSION
 
References: 
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