Identify bad optometry essentials 1, to go to a qualified and certified unit. 2, 15 years old or younger should be dilated optometry, 8 years old or younger must be dilated optometry. 3, without checking the eye position or adjustment situation, the prescription for optometry. 4, the lighting in the optometry room, by the outside or indoor light, resulting in different people being optometry, in different lighting conditions optometry. 5, a single emphasis on the adjustment of relaxed myopia glasses, not to check the adjustment of the situation, with progressive multifocal glasses, bifocal glasses, anti-fatigue glasses, regression glasses and other glasses. Five precautions with glasses 1, it is best to go to the regular hospital ophthalmology examination before prescription, some consumers vision loss is not caused by myopia or myopic astigmatism, may be caused by some eye diseases. Therefore, a systematic eye examination should be conducted before optometry to distinguish between true myopia and pseudomyopia. 2, go to a regular hospital or regular business dispensing glasses. To check whether the optometric equipment and testing instruments of the optical enterprises have qualified marks; whether the optometric dispensing personnel are licensed; whether the glasses have qualified marks (certificate), etc. 3, prescription glasses must go through the optometry, try on and other procedures. If necessary, the pupil should be astigmatism, especially minors and first-time prescription glasses. After the optometry, remember to ask for the optometry sheet. 4, pay attention to the choice of material of glasses. General eyeglass lenses are divided into resin, glass and crystal, etc. Lenses and frames should have a shelf life. If the lenses, frames and frames are imported materials, there should be imported commodity inspection certificate. 5, after the purchase of glasses, to obtain from the operator to formulate glasses processing sheet, invoices, after-sales commitment and other documents, so that in the future when problems arise to be able to defend their legitimate rights and interests. If you have an uncomfortable reaction, you should promptly consult an ophthalmologist or professional.