Many people believe that accurate optometry is very important, so “so-and-so place optometry accurate, go there with good glasses! has become the standard for measuring the level of optometry technology. In fact, this concept is wrong. Accurate optometry only accurately reflects the refractive state of the eye. However, wearing glasses involves the influence of many factors such as eye environment, eye style, age, adaptability, eye position, adjustment ability and collection ability. The purpose of glasses is to meet the needs of the eye, not just to “completely correct the refraction of the eye”! For example, a shooter requires very clear corrected vision. For example, a shooter requires very clear corrected vision, even if his bare eye vision is 1.0, it still does not meet his professional needs, so he may still need glasses that can correct to 1.5 vision; while a farmer who does not need to read, even if he has presbyopia problems, he does not need to wear presbyopic glasses. It can be seen that the purpose of wearing glasses is different from person to person, and the dispenser needs to give prescriptions based on the characteristics of different people and the specific needs of individuals on the basis of optometry. The refractive state of the human eye is also affected by the state of health, mental state and even time, and it is not easy to obtain a very accurate refractive state of the human eye (optometry results), which is also unstable. A person’s mental state varies, and the results will vary from time to time, so I don’t think it makes much sense to have an “accurate” eye exam. If we want to talk about the accuracy of the refractive state of the eye, I am afraid that computerized optometry will be more accurate. From the optometry results to the specific prescription, you need to follow the prescription principles. In my opinion, the prescription principle is more important than the accuracy of optometry! For example, for a 50-year-old patient with high astigmatism who has never worn glasses, is the astigmatism value 400 degrees or 375 degrees, and is the axial value 170 degrees or 175 degrees? The accuracy of this optometry is not important, what is important is whether the glasses can meet the patient’s comfortable eye needs. At this point in time, 200 degrees of astigmatism (which is far from the exact 400 degrees of astigmatism) may be the most appropriate prescription within the acceptable comfort range. Another example is that the prescription principles for internal and external occlusion are completely different, and the prescriptions for the same refractive error are completely different for patients with internal and external occlusion. Therefore, many times, in order to get “accurate” optometry results, we spend a lot of time obsessing over the 0.25D refraction or the 5 degree axis of astigmatism, but fail to use the prescription principles properly. Therefore, accurate optometry is only the beginning of optometry, not the end; “accurate” optometry is not necessarily “appropriate”! We are not doing refractive correction for a dead machine, but for a living person. More accurate optometry, but also less important than the correct use of the principles of prescription. A good optometrist is a master of the principles of prescription, not how accurate his results are. The glasses dispensed are in line with the comfortable use of the wearer and meet the needs and purposes of eye use.