Comparative Study of the Effect of Experimentally Induced Anisometropia on the Stereoacuity of Teenagers

Purpose: To examine the effect of experimental anisometropia on steroacuity in teenagers using Titmus Stereo Fly Test.

Methods: Fifty-six teenage volunteers (ages ranging from 16-19 years) participated in the present study. Placing trial lenses over the dominant eye (from -3.50D to +1D), two different anisometropia types (including myopia and hyperopia), were induced. Steroacuity was measured using the Titmus Stereo Fly Test. 

Results: In all the anisometropia types, there was a decline in stereopsis as anisometropia increased (p<0.05). The greatest impairment in stereoacuity was due to compound myopic anisometropia, -1.00DS and -3.50DS, +1.00DS and +3.50DS, and +2.00Ds and -2.00DS giving 3552 arc seconds in Titmus circles. 

Conclusion: Anisometropia reduces stereopsis and compound myopic anisometropia gives the most noticeable change. The impairment had no gender correlation.

Keywords: Stereoacuity, anisometropia, stereopsis.