On myopia, farsightedness, astigmatism and phoria, as long as the vision is low, has obvious impact on learning, work and life or leads to obvious visual fatigue, dizziness and headache symptoms, should be optometrist prescription, before 6 years old children are mostly farsighted, young people are mostly nearsighted, while the elderly are mostly phoria or mixed myopia, farsightedness or astigmatism. From the perspective of myopia treatment, patients with low myopia (≤300 degrees) are better off not wearing glasses during normal times and when reading, except for looking at the blackboard in class. The key to a qualified pair of glasses is the standardization and accuracy of optometry, and the general principle is that students before the age of 12 should first undergo atropine dilated large pupil medical examination and optometry, and then retest after 20 days of normal pupil recovery. 12-18 year old students can undergo rapid dilated pupil optometry, and then retest after the next day of normal pupil recovery. After the age of 18, students can undergo a non-dilated optometry examination, which is performed directly after the examination. The pupil is dilated because the student’s regulation is too strong, most of them have some pseudomyopia, through the pupil can make the regulation relatively paralyzed, the degree of optometry can be more accurate, re-testing and trial lenses is based on the original examination shadow optometry to wear glasses test, and according to the patient’s feelings to make reasonable adjustments. The most suitable glasses for myopia should be the lowest prescription that can see 5.0 with one eye and no obvious discomfort, and the highest prescription that can see 5.0 with one eye and no obvious discomfort should be the farsighted glasses. But also according to the patient has no strabismus, refractive aberration and other conditions specific determination, and finally determine the pupil distance to do for the reference value of the optical distance, once the optometry is not accurate, with glasses after wearing will produce blurred vision or eye swelling, eye pain or dizziness and nausea, and will also cause myopia significantly deepened. Generally, if the elderly do not mix farsightedness, myopia or astigmatism (i.e. good distance vision, no other eye discomfort symptoms except for near vision) can be determined by age: 50 years old – 100 degrees, 60 years old – 200 degrees, over 70 years old 300 degrees. If mixed with other conditions, you must go to the hospital to examine the shadow optometry. Computerized optometry is done automatically by a computerized analysis system based on the principle of shadowing optometry, but it is a preliminary result. Whether the eye is compatible with this result has to be determined by the final adjustment of an experienced doctor or optometrist, do not think that computerized optometry is more accurate than manual optometry.