Outpatient time, often encounter some people in the optical store prescription, the degree of overcorrection. They come to the clinic with certain commonalities: 1, visual fatigue; 2, dry eyes; 3, some are not clear about their own prescription overcorrection; 4, a pair of wearing glasses for a long time, forming a complete dependence, their own glasses corrected visual acuity of more than 1.2, some low vision. How to correct: 1, regardless of age, it is best to advise patients to dilate the pupil to accurately check the shadow, to objective check the shadow degree shall prevail, even if the corrected vision is poor, it does not matter, the next day follow-up optometry; 2, the next day optometry, according to the previous day check the shadow degree as the basis for corrective optometry, if the corrected vision is poorer than their own glasses, you can add a small amount of discretionary degrees, personal recommendations not more than 0.5 D; if still correction can not improve, it is recommended to use Compound tropicamide home before bedtime routine point use, bid, continuous use 15 days -30 days after the follow-up. 3.Long-term follow-up, observe the change of visual acuity and adjust the degree according to the situation. Daily optometry how to avoid the above situation; this puts higher requirements on the optometrist: 1, can not rely entirely on computerized optometry, according to the patient’s own situation to do a good job. 2, the conventional optometry method: mainly for the insert computer optometry, after the initial correction to 1.0, you can subtract +0.50 D, to see whether the visual acuity decline, if the direct decline to 0.6 below, then we believe that the degree at this time there is basically no overcorrection, otherwise continue to reduce the degree until 0.6 below. Then ensure that the addition of -0.25 to improve the line until 1.0 vision. 3, the degree has been tested to check the shadow verification, again to observe whether there is overcorrection phenomenon. If there is none, then the patient can be assured to wear the lenses and try them on and get a prescription. Avoid overcorrection, which brings unnecessary trouble to the patient’s eyes.