1, to ensure that the refractive error person’s prescription is accurate, and to master the principles of refractive error prescription; 2, optometry trial glasses should be more than half an hour, no dizziness and eye distension and other discomfort, the pupil distance measurement of both eyes should be accurate; 3, to do the prescription of prescription and other parameters and glasses exactly the same; 4, frame size, shape to fit the distance of the pupil and face shape; frame geometric center and pupil distance to 5, the glasses themselves: good quality lenses, uniform density, good clean transparency, reasonable processing design, fine grinding process; 6, the maintenance of glasses: when wearing glasses frame can be tilted down about 5 degrees, hands to take off the glasses, when not wearing put in the glasses box, keep the glasses frame is not deformed.