METHODS: A prospective study was conducted for 84 patients(165 eyes)with myopia who wore overnight Ortho-K lens for the first time. All patients were randomly divided into two groups with 38 patients(76 eyes)in observation group wearing AC custom-made Ortho-K lens and 46 patients(89 eyes)in control group wearing standard Ortho-K lens. Three items including the uncorrected visual acuity(UCVA), corneal topography, and the complications of corneal epithelium were observed and quantized to be evaluated at 1mo after Ortho-K lens wearing.

RESULTS: The assessment of 156 eyes(94.5%, including 73 eyes in observation group and 83 eyes in control group)in Ortho-K lens fitting were fine or acceptable at 1mo. Only 9 eyes(5.5%, including 3 eyes in observation group and 6 eyes in control group)were not good or unacceptable at that time, so that their Ortho-K lens had to be followed-up ulteriorly or changed instead. In all examination of this study, the UCVA of 159 eyes(96.4%, including 74 eyes in observation group and 85 eyes in control group)could reach one line lower to the BVCA or better in standard logarithmic visual acuity chart. The assessment of 157 eyes(95.2%, including 73 eyes in observation group and 84 eyes in control group)in corneal topography were fine or acceptable and there were no patients that had any serious complications in corneal epithelium. The observation group wearing AC custom-made Ortho-K lens performed better than the control group wearing standard Ortho-K lens in the result of UCVA, corneal topography, and the complications in corneal epithelium(P<0.05).

CONCLUSION: The overnight orthokeratology was effective and satisfying. AC custom-made Ortho-K lens performed better than standard Ortho-K lens in the assessment after wearing for 1mo.