The other day, Zhang’s eyesight gradually decreased, he has been to the optician to change a few pairs of glasses always no improvement. Finally, he was persuaded by his family to visit the ophthalmologist, not knowing that he was diagnosed with advanced chronic simple glaucoma. After a complex surgical procedure, he was able to preserve his remaining vision. People usually think that if you have bad vision, you can buy a pair of glasses and be done with it. It is not known that when you delay the best time for treatment of eye disease after prescription glasses, it will cause irreparable damage. Wearing glasses for a long time the universal application, simple, safe and effective optical correction method, can correct all types of refractive error, so that parallel light through the eye refractive system will be in front of the retina or back of the original focus backward or forward to the retina, vision to effectively enhance the normal level; at the same time, so that the eye regulation and radiation to regain the balance of coordination, both to see the scene, but also to eliminate the The imbalance between the irradiation and the adjustment can eliminate the visual fatigue caused by the imbalance, and can prevent and control the eye position skew closely related to the imbalance. However, before the prescription of glasses, first of all, after a comprehensive eye examination to determine the eye normal, and then according to the visual acuity examination and visual fatigue and symptoms, only then can be considered or clearly diagnosed as refractive error. The purpose of prescription lenses for myopia is to correct refraction and improve visual acuity. Low and moderate myopia with glasses, corrected visual acuity can generally reach the normal standard 1.0. The guideline is: among the lenses that can obtain corrected visual acuity 1.0, choose the lowest and comfortable for the eyes after wearing them, do not overdo it or underdo it too much. Wearing glasses that are too much or not enough will increase the adjustment burden of the eyes and contribute to the deepening of myopia. Therefore, if your child’s vision is below 0.6, he or she should wear glasses if he or she is truly nearsighted. Otherwise, the child will squint to see things in the distance, and over time, the myopia will increase very quickly. Eyeglasses cannot be bought and dispensed casually, but must be examined by a professional ophthalmologist to correctly identify true or pseudomyopia respectively. Only true myopia, with poor vision, requires glasses. For farsightedness, complete correction with optimal vision should be the guideline, as undercorrection can lead to amblyopia. The principle of correction of presbyopia should be based on my current refractive state, plus his declining refractive adjustment degree, so that it reaches the most comfortable to see close to the degree of So be sure to do the necessary eye examination and accurate medical optometry, all have poor vision, whether self-perception or vision examination found, should go to the hospital ophthalmology necessary examination is appropriate, do not think that subjectively identified as having myopia The reason for this is that you should not think that you have myopia or presbyopia, and for fear of trouble, you should get a pair of glasses that can improve your vision. If you lose the proper time to discover and treat eye diseases in time, you are bound to delay your condition and even leave regrets.