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目的为了客观评价视网膜计对白内障患者潜视力预测的准确率、找出影响准确率的相关因素和指导其临床应用。方法对拟手术患者600例白内障患者在手术前用视网膜计对患者的潜在视力(手术后可能达到的视力)进行预测,手术后对其视力复查。并以第2周时做验光矫正后所达到的最佳视力为准。结果判定标准:相符:手术后2周所达视力与手术前预测一致或相差一行对数视力者;基本相符:手术后视力与手术前预测相差2行者;不符:手术后视力与手术前预测相差2行以上者。结果600眼中其中手术前预测与手术后实际最佳矫正视力相符者85眼占14.17%,基本相符者339眼占56.50%,不符合者176眼,占29.33%,总体符合率为70.67%。其中107眼超度高近视眼中符合与基本符合相加所占比例高达93.46%。结论视网膜计具有预测方法简便,检查时间短,结果符合率较高,有较高的参考价值,可以作为白内障手术前常规检查项目。影响其准确率的因素主要有:成熟期、IV级以上硬度核白内障因光栅的透过性差而直接影响患者的分辨能力和测试准确度。高龄、弱智、不合作者也是相关因素。
Objective To objectively evaluate the accuracy of retina in the prediction of latent power of cataract patients and find out the related factors that affect the accuracy and guide its clinical application. Methods The potential visual acuity (potential visual acuity after surgery) of 600 patients with cataract who underwent surgery was predicted by retinoscope before surgery. Visual acuity was assessed after surgery. And the best visual acuity reached after the second optometry correction date shall prevail. Results Criteria: Consistency: 2 weeks after surgery, the visual acuity was the same as or different from the pre-operative vision. One-line visual acuity was basically consistent with the difference between preoperative and postoperative visual acuity. There was a discrepancy between visual acuity and preoperative prediction More than 2 lines. Results Among 600 eyes, 85 eyes (85 eyes) accounted for 14.17%, 33 eyes (56.50%), 176 eyes non-compliance (29.33%), and the overall coincidence rate was 70.67%. One of 107 eyes with hyperopic high myopia consistent with the basic coincidence with the proportion of up to 93.46%. Conclusion Retina meter with predictive method is simple, short examination time, the results of a high coincidence rate, a higher reference value, can be used as a routine examination before cataract surgery. The main factors affecting the accuracy rate are: maturity, grade IV or higher hardness of the cataracts due to poor transmission of the grating directly affect the patient’s ability to distinguish and test accuracy. Elderly, mentally handicapped, non-partners are also related factors.