Abstract:

Objective To investigate the characteristics of the binocular rivalry of children with amblyopia. Design Prospective case series. Participants 90 mild, moderate, severe amblyopic children with normal eye position, each group included 30 cases. Method The main test method was the computer based visual perceptual test software, each amblyopic child must take the binocular visual balance point of dynamic signal to noise ratio, static signal to noise ratio, dynamic contrast sensitivity, static contrast sensitivity. Main Outcome Measures The measured value of each binocular visual balance point. Results (1) In mild, moderate, severe amblyopic children, the binocular balance point of static signal to noise ratio was 6.17±1.548, 5.51±1.804 and 2.08±0.935 respectively (H=51.526, P<0.001); the binocular balance point of dynamic signal to noise ratio was 6.42±1.334, 5.73±1.840 and 2.34±1.260 respectively (H=58.453, P<0.001); the binocular balance point of static contrast sensitivity was 7.08±2.350, 6.44±2.520 and 3.52±2.365 respectively (H=26.826, P<0.001); the binocular balance point of dynamic contrast sensitivity was 7.40±2.430, 7.13±2.554 and 3.31±2.007 respectively (H=42.200, P<0.001). (2) In mild, moderate, severe amblyopic children, the difference between two eyes of static signal to noise ratio was 1.67±1.561, 2.20±1.584 and 4.71±2.312 respectively (H=20.873, P<0.001); the difference between two eyes of dynamic signal to noise ratio was 1.33±1.241, 1.90±1.739 and 4.52±2.293 respectively (H=26.684, P<0.001); the difference between two eyes of static contrast sensitivity was 2.67±1.709, 2.73±2.651 and 5.48±3.329 respectively (H=11.116, P=0.004); the difference between two eyes of dynamic contrast sensitivity was 2.50±2.080, 2.72±2.534 and 5.00±3.327 respectively (H=10.396, P=0.006). Conclusion The binocular visual balance point of signal to noise ratio and contrast sensitivity was abnormal in amblyopic children with normal eye position. The more severe the degree of amblyopia, the more serious the abnormality was. The difference between two eyes of signal to noise ratio and contrast sensitivity increased with the degree of amblyopia. (Ophthalmol CHN, 2017, 26: 295-298)

Key words: amblyopia, binocular vision, signal to noise ratio, contrast sensitivity