AIM: To analyze the effects on binocular vision after wearing Ortho K(OK)contact lens for myopic anisometropia.

METHODS: A total of 40 cases of myopic anisometropia corrected by Ortho K contact lens were collected. The average age of participants was 11.32±2.56y. The refractive error varied from -1.25D to -5.75D, on average -3.18±1.12D. The amount of myopic anisometropia was -4.64±1.52D. All the cases were followed-up for 3mo. The uncorrected visual acuity(UCVA), best corrected visual acuity(BCVA), refraction and binocular vision were checked pre-wearing Ortho K contact lens, and 3mo post wearing respectively.

RESULTS:The mean UCVA was 4.0±0.2, and BCVA was 4.96±0.2, the amount of myopic anisometropia was -4.64±1.52D pre-wearing OK contact lens. The mean UCVA was 4.97±0.07, and BCVA was 4.99±0.1, the amount of myopic anisometropia was 0.23±0.12D, at post wearing OK lens 3 months respectively. The UCVA, BCVA, the amount of myopic anisometropia at post correction was significantly difference with pre-correction(P<0.05). Before correction, 36 cases got simultaneous binocular visions, 21 cases got combined visions, 13 cases got long distance stereopsis visions. Simultaneous binocular visions existed in 40 cases, combined visions existed in 36 cases, long distance stereopsis visions existed in 23 cases post correction 3mo. Compared with pre-correction, the difference was significantly. Before correction, 14 cases had macular fovea stereo vision. Abnormal stereo vision existed in 26 cases, including 13 cases with macula stereo vision, 7 cases with peripheral stereo vision, and 6 cases with stereo vision blind. Macular fovea stereo vision was found in 27 cases, Abnormal stereo vision existed in 13 cases, including 7 cases with macula stereo vision, 3 cases with peripheral stereo vision, and 3 cases with stereo vision blind after wearing Ortho K contact lens 3mo.

CONCLUSION:Most myopic anisometropia patients can improve their visual acuity, reduce the refractive difference, and increase combined and stereopsis vision after wearing Ortho K contact lens 3mo.