目的：评价配戴基弧非球面设计角膜塑形镜控制近视的临床效果。

方法：前瞻性研究。选取2020-01/2021-07于我院验配角膜塑形镜的8～13岁近视患者94例94眼(单眼接受角膜塑形镜治疗者，选取该眼作为观察眼，双眼均接受角膜塑形镜治疗的患者则以右眼作为观察眼)，根据患者所配戴的角膜塑形镜基弧区的设计不同分为观察组：配戴基弧非球面设计的角膜塑形镜患者46例； 对照组：配戴基弧球面设计的角膜塑形镜患者48例。根据两组患者戴镜前等效球镜(SE)不同进一步分为低度近视组(-3.00D结果：所有患者均完成随访，戴镜1mo后观察组裸眼视力(LogMAR)-0.12±0.08与对照组(-0.17±0.07)比较无差异(P>0.05)； 两组患者戴镜后6mo，1a眼轴增长平均值均无差异(均P>0.05)。低度近视组中，观察组戴镜1a眼轴增长值为0.19±0.17mm，明显低于对照组(0.31±0.18mm)(P<0.05)； 中度近视组中，观察组戴镜1a眼轴增长值为0.22±0.18mm，与对照组(0.19±0.12mm)比较无差异(P>0.05)。戴镜后6mo，1a观察组低度近视组与中度近视组眼轴增长值无差异(P>0.05)，而对照组低度近视与中度近视组戴镜后6mo(0.15±0.13 vs 0.05±0.12mm)、1a(0.31±0.18 vs 0.19±0.12mm)眼轴增长值均有差异(均P<0.05)。

结论：配戴基弧非球面设计角膜塑形镜可以有效提高裸眼视力，延缓眼轴增长。对于低度近视患者，基弧非球面设计角膜塑形镜延缓眼轴增长的效果优于基弧球面设计。

METHODS: A prospective study was conducted. A total of 94 cases(94 eyes)of myopia aged 8～13 years old who were fitted with orthokeratology(OK)lens in our hospital from January 2020 to July 2021 were selected(for patients who received OK lens in one eye, the eye is selected as the observation eye, and for patients who receive OK lens in both eyes, the right eye is used as the observation eye). Patients were divided into two groups according to the design of the OK lens, with 46 cases wearing base curve aspheric OK lens in study group and 48 cases wearing base curve spheric OK lens in control group. The study group and the control group were further divided into low myopia group(-3.00D< SE ≤-0.75D)and moderate myopia group(-6.00D< SE ≤-3.00D)according to the baseline spherical equivalent(SE), with 52 cases(52 eyes)in the low myopia group and 42 cases(42 eyes)in the moderate myopia group. Uncorrected visual acuity(UCVA)was evaluated at 1d, 1wk, 1, 3, 6 and 9mo after wearing lenses, and axial length were measured at 6mo and 1a after wearing lenses respectively.

RESULTS: All patients completed follow-up, and there was no significant differences in UCVA(LogMAR)between the study group(-0.12±0.08)and the control group(-0.17±0.07)after wearing the OK lens for 1mo(P>0.05); the mean axial length elongation between the two groups had no significant differences after wearing lenses for 6mo and 1a(all P>0.05). In the low myopia group, the axial length elongation of the study group was 0.19±0.17mm after wearing OK lens for 1a, which was significantly lower than that of the control group(0.31±0.18mm; P<0.05); while in the moderate myopia group, the axial length elongation was 0.22±0.18mm, and it had no significant differences with that in the control group(0.19±0.12mm; P>0.05). There was no significant differences in axial length elongation between the low myopia group and the moderate myopia group in study group after wearing lenses for 6mo and 1a(P>0.05), while there was differences in axial length elongation between low myopia group and moderate myopia group in the control group after wearing lenses for 6mo(0.15±0.13 vs. 0.05±0.12mm)and 1a(0.31±0.18 vs. 0.19±0.12mm; all P<0.05).

CONCLUSION: Wearing base curve aspheric OK lens can effectively improve the UCVA and control the elongation of axial length. For patients with low myopia, base curve aspheric OK lens had a better efficacy in controlling the elongation of axial length than the spheric OK lens.