How to look at the computer optometry sheet

How to look at the computer optometry sheet

How do you look at a computer optometry sheet? Many people choose to buy glasses online, because online glasses are much cheaper than physical stores, and there are many styles of glasses to choose from, but you need to know your prescription to get the right glasses. Most people in the hospital or optical store after the optometry, facing the optometry sheet, do not know what the data in it represents, today I can explain to you: computer optometry. Let's take a computerized optometry sheet as an example, where R (Right) stands for: right eye; L (Left) means: left eye; S (Sphere) means: spherical lens, that is, the degree of myopia or farsightedness; C (Cylinder) means: cylindrical mirror, that is, the degree of astigmatism; A (Axis) represents: axis position, that is, the direction of the astigmatism axis; VD (Vertex Distance) - Vertex Distance (also known as spectacular distance, spectacle angle distance): the distance from the center of the posterior surface of the spectacle lens to the apex of the cornea; PD means: interpupillary distance, which is the distance between the two points in the center of the pupil of the left and right eyes, and the PD on the optometry sheet refers to the interpupillary distance of both eyes. From the above optometry sheet, we can clearly understand the meaning of each data, and finally get the power of our eyes, astigmatism, the direction of the astigmatism axis and the interpupillary distance. However, there is also a certain error in computer optometry, which can only be used as a reference, and many optical shops can obtain accurate data through further verification by professional optometrists using optometry lenses.