How to read a myopia prescription

Oct 26, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

Under normal circumstances, a myopia prescription includes indicators such as spherical power, cylindrical power, axis of astigmatism, and pupillary distance. The spherical power, denoted by "S," represents the curvature of the front part of the eyeball and the anterior surface of the lens, indicating the specific degree of nearsightedness or farsightedness. The normal range is from 0 to +50 diopters. Generally, a "+" sign indicates hyperopia (farsightedness), while a "-" sign indicates myopia (nearsightedness).

In general, a myopia eye examination prescription can be interpreted by looking at indicators such as spherical power, cylindrical power, astigmatism axis, and pupillary distance. The specific analysis is as follows:

1. Spherical Power: The spherical power refers to the curvature of the front part of the eyeball and the anterior surface of the lens, denoted by "S", indicating the degree of nearsightedness or farsightedness. The normal range is 0 to +50 degrees. Typically, a "+" sign indicates hyperopia (farsightedness), while a "-" sign indicates myopia (nearsightedness).

2. Cylindrical Power: The cylindrical power measures the degree of astigmatism in the eye's refractive system, denoted by "C", indicating the extent of astigmatism. The normal range is within 50 degrees.

3. Astigmatism Axis: The astigmatism axis refers to the direction of astigmatism, ranging from 0 to 180 degrees, denoted by "AD". The normal values are typically 180 degrees, 90 degrees, and 45 degrees.

4. Pupillary Distance (PD): The pupillary distance is the distance between the pupils of the two eyes, denoted by "PD". The normal pupillary distance is approximately 61 mm for males and about 58 mm for females.

In addition, "R" stands for the right eye and "L" for the left eye. If myopia or hyperopia is present, it is recommended to seek medical treatment promptly to avoid adverse effects.

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