Abstract:

 Objective To evaluate the binocular visual perception function after cure of amblyopia in children. Design Retrospective case series. Paticipants 75 children with cured amblyopia due to ametropia and anisometropia. Methods The patients were divided into mild, moderate and severe amblyopia group according to the corrected visual acuity. Mild amblyopia was defined as corrected visual acuity varied from 0.6 to 0.8, moderate amblyopia with 0.2 to 0.5, severe amblyopia with less than 0.1. The quantitative assessment of binocular visual perception function in the three groups was compared. Main Outcome Measures Binocular perception eye position difference, binocular fixation difference, signal-to-noise ratio balance point difference, contrast balance difference, and the passing rate of random point 0-order, 1-order, 2-order stereopsis tests. Results After the participants with mild, medium and severe amblyopia were cured, we found that 3 °optotype horizontal eye level averaged at 22.63±18.94, 31.96±32.70, 46.86 ±31.70 pixels, respectively. The vertical eye level averaged at 3.59±4.36, 4.66±4.29, 9.93±10.27 pixels. 1 °optotype horizontal eye level averaged at 28.00±22.68, 36.06±26.90, 31.33±22.42 pixels, and the vertical eye level averaged at 4.74±5.15, 5.69±5.04, 7.80±12.03 pixels respectively. Binocular fixation stability averaged at 4.11±1.99, 4.79±2.37, 2.36±3.24 pixels for the three groups respectively. The static signal-to-noise ratio balance point averaged at 6.52±1.31, 6.12±1.72, 5.83±2.68 level. The balance point of static contrast averaged at 7.70±1.78 7.12±2.29 and 6.53±3.05 level. The static signal-to-noise ratio balance point difference was 1.48±1.48, 1.63±1.45 and 2.20±1.89 level and the balance point of static contrast difference was 1.92±1.66, 2.24±1.95 and 3.60±2.89 level respectively. In the random point 0-order stereoscopic test, 53 cases (71%) achieved 100 ", with 68 cases (90%) in 1-order stereoscopic test and 73 cases (97%) in 2-order stereopsis test. Conclusion After cure of amblyopia, the binocular perception, eye position, binocular inhibition and the stereopsis of different channels have not reached normal level. This new method of examination and analysis of the results of the visual recovery offers a new way to recognize the defects of visual system after cure of amblyopia. (Ophthalmol CHN, 2017, 26: 299-302)

Key words: amblyopia, inhibition, stereoscopic, binocular fixation, binocular perception eye position