Abstract:

Objective To find out the normal range of the binocular rivalry of children with normal vision and to investigate the characteristics of the binocular rivalry of amblyopic children. Design Prospective case series. Participants 97 children with normal visual acuity and 60 amblyopic children. Methods The binocular rivalry of the amblyopic children and children with normal visual acuity were assessed using the computer based visual perception examination. Main Outcome Measures The binocular visual balance point of dynamic contrast sensitivity (DCS), static contrast sensitivity (SCS), dynamic signal to noise ratio (DSNR), and static signal to noise ratio (SSNR). Result In the children with normal visual acuity, the SSNR point was 7.44±0.052 grade (95% CI: 7.34~7.55 grade), the DSNR point was 7.50±0.048 grade (95% CI: 7.41~7.60 grade); the SCS point was 8.46±0.085 grade (95% CI: 8.29~8.63 grade), and the DCS point was 8.57±0.089 grade (95% CI: 8.40~8.75 grade). In the amblyopic children, the SSNR point was 5.48±0.186 grade (95% CI: 5.47~6.21 grade), the DSNR point was 6.16±0.177 grade (95% CI: 5.81~6.52 grade); the SCS point was 7.24±0.244 grade (95% CI: 6.76~7.73 grade), the DCS point was 7.52±0.239 grade (95% CI: 7.05~8.00 grade). The binocular balance point value in amblyopic children was lower than in normal vision children (all P<0.001). The difference value between two eyes in the normal vision children was less than 1 grade while the difference value between two eyes in the amblyopic children was more than 2 grades. Conclusion We recommend that the binocular balance point of the contrast sensitivity over 7 grade and signal to noise ratio over 8 grade as the normal standard. There is obvious difference between the amblyopic children and the normal vision children in the binocular balance point value, and the differences between two eyes in amblyopic children are greater than that in normal vision children. (Ophthalmol CHN, 2016, 25: 310-313)

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