Objective This study was to study the effect of monovision contact lens (MV-CL) on distant and near vision,distant and near stereopsis,and to identify the effect of degree of monovision on vision function.Methods A prospective case observational study was designed.The clinical data of sixty-eight eyes of 47 cases were collected from November 2010 to August 2014 in Henan Provincial Corps Hospital,Chinese People's Armed Police Forces.Sixty-eight eyes of 47 cases wore contact lenses to improve near vision,in which the other eye of 21 cases with hyperopia wearing contact lenses to improve distant vision.Besides,far and near stereopsis were measured before and two weeks after wearing lenses respectively;and scotopia were measrued with lenses and in naked eyes respectively.Compared the changes of vision and stereopsis in patients before and after the MV-CL,and conducted the patient satisfaction survey.Results There were 89％ (42/47 cases) and 6％ (3/47 cases) of the patients whose naked far and near vision was 0.8/0.33 (J4) at 2 weeks after MV-CL and before MV-CL,respectively.There were no statistical significance about change of near stereopsis with Titmus stereopicture and the Yan's near random-dot stereogram (x2=1.30,0.56;both at P＞0.05).There were no statistical significance about change with apparent machine random dot stereogram iterative crossed parallax and uncrossed disparity (x2 =0.16,0.11;both at P＞0.05).The far distance fusion range and far stereopsis were not significantly different between before and after MV-CL (x2 =0.22,0.16;both at P＞0.05).Titmus stereopicture tests showed that there was a decrease in the number of people who had foveal stereopsis,while an increase was found in people who had macular stereopsis after MV-CL,but the difference had no statistical significance (x2 =2.28,P ＞ 0.05).Conclusions Near vision can be obviously increased and presbytism can be relieved by MV-CL.Stereopsis of some patients are decreased after MV-CL,but this can be accepted by the patients and there is no obvious decrease in far range of fusion.%目的 研究单眼视法配戴角膜接触镜(MV-CL)前后远、近视力及立体视的改变,明确MV-CL对老视者立体视功能的影响程度. 方法 采用前瞻性病例观察研究设计.连续收集2010年11月至2014年8月在武警河南总队医院眼科接受老视治疗的患者47例68眼,所有患者一眼配戴远视用角膜接触镜治疗以改善近视力,其中21例伴轻度远视者另一眼同时配戴角膜接触镜治疗以提高远视力,并分别于戴镜前、戴镜后2周测量远近视力及立体视.比较MV-CL前后患者视力和立体视的变化,并进行患者满意度调查. 结果 MV-CL后,有42例(占89％)患者双眼裸眼远、近视力达0.8/0.33 (J4)或更好,戴镜前仅3例(占6％)达到此视力.Titmus立体图检查及颜氏随机点立体图检查均显示,近距离立体视觉的变化差异均无统计学意义(x2=1.30、0.56,均P＞0.05);同视机随机点立体图检查显示,交叉视差及非交叉视差立体视觉有所降低,但差异均无统计学意义(x2=0.16、0.11,均P＞0.05),与戴镜前比较,戴镜后2周远融合范围有所减小、远立体视觉有所降低,差异均无统计学意义(x2=0.22、0.16,均P＞0.05).Titmus立体图检查结果显示,与MV-CL前比较,MV-CL后远立体视锐度中心凹立体视人数减少,MV-CL后黄斑立体视人数增加,但差异无统计学意义(x2=2.28,P＞0.05).结论 MV-CL能明显提高近视力,有效缓解老视症状,可以引起部分患者立体视锐度的减退,但均在患者可接受范围,其远融合范围无明显减少.
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