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Evaluation of the photorefractive keratectomy effect on stereoacuity in anisometropic myopia

Poster Details

First Author: H.Hasani IRAN

Co Author(s):    F. Karimian   M. Aghazade Amiri   M. Tabatabaie   N. Dadbin           

Abstract Details


To determine changes of streoacuity in anisometropic myopic eyes after photorefractive keratectomy (PRK).


Shahid Beheshti University of Medical Sciences


This clinical trial study was performed in myopic patients with at least 1 D anisometropia (in spherical equevalent, spherical or astigmatism)who underwent PRK by Technolas 217 Z excimer laser machine. Changes in streoacuity was observed by TNO and butterfly stereoacuity test before PRK and at 2 weeks, 1 month and 3 months after PRK.


98 eyes of 49 patients (71.4% male and 28.6% female) with mean age of 28� 5.5 years and mean myopia of -3.32�1.74D and mean astigmatism of 1.3� 1.3D were enrolled in study.The preoperative mean stereoacuity values 102� 103.44 sec/arc and 56.8�41 sec/arc by TNO and Butterfly Stereoacuity test changed to 90�110.52 sec/arc (P=0.009) , and 56.5� 41.3 sec/arc (p=0.805) respectively at 3 months after PRK. Total proportion of improvement in stereoacuity values was 10.2% and 6.12% by TNO and Butterfly Stereoacuity test respectively.


Stereo acuity improves after photorefractive keratectomy in anisometropic myopic patients. This improvement is more significant with TNO test than the Butterfly Stereoacuity test.

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