Abstract:  Objective To investigate the perceptual eye position and gaze stability of the children with normal visual acuity under dichoptic vision condition.  Design Prospective case series. Participants The study included 97 children with normal visual acuity and the age of 5 to 7 years. Method The main test method was the computer based visual perceptual test. The children should stare at the center of the screen, the distance between the child and the screen was about 80 cm. Each child must take the visual perceptual and gaze stability tests after regular ophthalmology examinations. Main Outcome Measures The deviation pixels of perception eye position and the gaze stability. Results When the target size was 3 degree, the horizontal eye position was 4.73~6.83 pixels, and the mean eye position was (5.78±1.51) pixels; the vertical eye position was 2.12~2.31 pixels, and the mean eye position was (2.72±0.85) pixels. When the target size was 1 degree, the horizontal eye position was 5.64~8.06 pixels, and the mean eye position was (6.85±1.74) pixels; the vertical eye position was 1.37~2.03 pixels, and the mean eye position was (1.70±0.48) pixels. The gaze stability deviation was 4.25~5.09 pixels, the mean deviation was (4.67±1.03) pixels. Conclusion The results of the perceptual eye position and gaze stability of this study may be taken as the clinical references of children with normal visual acuity.(Ophthalmol CHN, 2014, 23: 312-315)

Key words: visual perception, eye position, gaze stability, fixation eye movement