How to read an eyeglass prescription

Oct 25, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

The items on a prescription for eyeglasses are generally indicated by English letters: R stands for the right eye, and L for the left eye. Other items are usually represented by letters such as S, C, A, PD, and VD. Note that each of these values has its specific meaning; therefore, if you have myopia, it is essential to visit a正规 hospital for an accurate measurement before selecting the appropriate eyeglass prescription.

The items on an eyeglass prescription are generally indicated by English letters: R stands for the right eye and L for the left eye. Other items are typically represented by letters such as S, C, A, PD, and VD. Here's a detailed explanation:

1. S

Represents the spherical lens, commonly known as myopia (nearsightedness) or hyperopia (farsightedness). A "+" sign before the value of S indicates hyperopia, while a "-" sign indicates myopia. For example, S: +1.15 means 115 degrees of hyperopia, and S: -1.15 means 115 degrees of myopia.

2. C

Represents the cylindrical lens, which refers to astigmatism. A "+" sign before the value of C indicates hyperopic astigmatism, while a "-" sign indicates myopic astigmatism. For example, C: +1.15 means 115 degrees of hyperopic astigmatism, and C: -1.15 means 115 degrees of myopic astigmatism.

3. A

Represents the astigmatism axis, which is usually marked following the astigmatism value. For instance, if the number under A is 180, it means the astigmatism axis is at 180 degrees.

4. PD

Stands for pupillary distance, which is the distance between the centers of the pupils of the two eyes.

5. VD

Represents the vertex distance, i.e., the distance from the back surface of the eyeglass lens to the front part of the cornea.

Note: Each of the above values has its specific meaning. Therefore, if you have myopia or any other vision issues, be sure to visit a正规 hospital for accurate measurement and choose the appropriate eyeglass prescription accordingly.

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Fundus manifestations of glaucoma

Glaucoma may present with fundus manifestations such as decreased vision, iris changes, and eye swelling. When patients suffer from glaucoma, their vision also declines accordingly. This is because glaucoma can cause the iris to elongate and lose elasticity, leading to myopia. Patients can visit a正规 hospital and, under medical guidance, undergo optometry and wear corrective glasses to alleviate symptoms.