Interpretation of visual acuity and myopia

Abstract: in short, myopia refers to the diopter of the cornea, and vision refers to the ability of fundus retinal imaging. The same degree can have different vision. Similarly, the same vision can also have different degrees.

it seems that when many people talk about the eyesight chart, they will think that there is a certain relationship between eyesight and myopia, and will continue to ask how much it is to convert eyesight into myopia.

in fact, vision and myopia are two different concepts.

eyesight

First says “eyesight”, which simply means people’s ability to see things clearly. The quality of eyesight is judged by the distance of seeing things clearly. The good ones are 1.2, 1.5 and the bad ones are 0.1. Immediate defense Light perception (that is, you can’t see clearly and can only feel the presence of light). There are many factors affecting vision, and eye inflammation can cause vision loss (trachoma, red eye disease, etc.); trauma can also cause vision loss; diseases such as crystal opacity, vitreous opacity and retinopathy can also cause vision loss; however, the vision loss of most young students is mostly related to close eye fatigue.

myopia degree

Myopia generally refers to diopter. For the eyes, the most direct change in refraction is reflected in the bending degree of the lens. The closer the visual object is, the greater the curvature of the lens is. In terms of adjustment, it is more laborious. In terms of self perception, it is eye fatigue; The lens is equivalent to a convex lens, that is, it can adjust its bending degree according to its own needs to change the distance of the focus, so as to see the object clearly.

warm tips

in short, myopia refers to the diopter of the cornea, and vision refers to the ability of fundus retinal imaging. The same degree can have different vision. Similarly, the same vision can also have different degrees.

although the higher the degree of the same person in the same period, the worse the eyesight is, there is no absolute relationship between eyesight and myopia, and it is even more out of proportion. Some of my patients have myopia of 600 degrees, and the visual acuity test chart is 0.2. Some have myopia of only 400 degrees, and the visual acuity test is also 0.2. So, this is just an inspection standard.