Abstract:

Objective To study the relationship between dominant eye, spherical equivalence (SE) of refractive error and accommodation in myopic anisometropia. Design Retrospective case series. Participants 59 myopic anisometropic patients were included in the study, with age varied from eight to thirty-five years. Patients were divided into two groups according to the anisometropic degree, group A (difference beween 1.00 D and 2.50 D in two eyes) and group B (difference more than 2.50 D). Methods Monocular and binocular positive relative accommodation (PRA), negative relative accommodation (NRA), amplitude of accommodation, and accommodative facility were all measured with phoropter. Dominant eye was identified by the means of hole shaped by two hands. Main Outcome Measures Dominant eye, SE, and monocular and binocular accommodation parameters (PRA, NRA, amplitude of accommodation, accommodative facility). Results 26 patients were included in group A. Dominant eye was right in 22 patients (84.5%). The mean SE was -4.01±1.96 D (mean ± standard deviation) and -3.19±1.80 D in dominant and non-dominant eye respectively. The mean anisometropia was 1.76±0.21 D. The refraction was significantly different in dominant and non-dominant eyes (z=-2.37, P=0.02). 33 patients were included in group B. Dominant eye was right in 21 patients (63.6%). The mean SE was -3.90±2.84 D and -3.47±2.20 D in dominant and non-dominant eye respectively. The mean anisometropia was 3.40±0.81 D. The refraction was no significantly different in dominant and non-dominant eyes (z=-0.57, P=0.57). The mean PRA was -2.68±1.44 D and -3.29±1.31 D in dominant and non-dominant eyes in group A(z=-2.27, P=0.02). The mean PRA was -3.14±1.84 D and -4.10±1.59 D in dominant and non-dominant eyes in group B (z=-3.54, P=0.00). The mean absolute PRA/NRA value was 1.15±0.58 and 1.36±0.52 in dominant and non-dominant eyes in group A(z=-1.89, P=0.06). The mean absolute PRA/NRA value was 1.34±1.57 and 1.74±0.62 in dominant and non-dominant eyes in group B(z=-3.03, P=0.00). Conclusion SE in dominant eyes of patients with low myopic anisometropia was higher than non-dominant eyes. PRA and PRA/NRA in dominant eyes were lower than non-dominant eyes in different degree anisometropic patients. (Ophthalmol CHN, 2016, 25: 102-105)

Key words: myopia, anisometropia, dominant eye, accommodation