Determining the Relationship between Anisometropia as Well as Visual Acuity, Aniseikonia and Stereopsis in the Absence of Strabismus

Abstract

The present study sought to determine the relationship between anisometropia type and its effects on monocular and binocular best-corrected vision acuity (BCVA), aniseikonia, and stereopsis in the absence of strabismus.

The study comprised 162 people with anisometropia and healthy eyes who had never received amblyopia treatment or had eye surgery. According to spherical and cylindrical components and spherical equivalent, they were divided into the spherical hyperopic anisometropia (SHA, n = 31), spherical myopic anisometropia (SMA, n = 45), astigmatic or cylindrical hyperopic anisometropja (CIIA, n = 22), and astigmatic or cylindrical myopic anisometropia (CMA, n = 64) groups. Patients without anisometropia (NA, n = 188) were classified under the control group. Anisometropia was studied for its impact on monocular and binocular BCVA, aniseikonia, and stereoacuity.

The NA group had a significantly lower Logiv4AR of BCVA in the t`ro eyes than the SHA, SMA, CMA, and CHA groups. Moreover, the SMA group had significantly lower Logiv4AR of BCVA than the CIIA group (p < 0.05). However, there was no significant difference bet\veen the groups in terms the descriptive values of anjseikonia (p = 0.052). The SMA groups had significantly lower stereoacuity values in logio arc seconds than the CMA (p < 0.05) and SHA (p < 0.05) groups. There was a significantly positive correlation in the anisometropia group between ahiseikoria and stereoacuity values in logl0 arc seconds (r = 0.160; p = 0.041). The type of anisometropia and low monocular and binocular BCVA were associated with stereopsis.