How to read an eyeglass prescription

Oct 26, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

In general, a prescription for eyeglasses includes indicators such as spherical power, cylindrical power, axis of astigmatism, pupillary distance (PD), and interpupillary distance. The spherical power indicates the degree of nearsightedness or farsightedness, denoted by "S". The normal range for spherical power is from 0 to +50 degrees. The cylindrical power refers to the degree of astigmatism, denoted by "C". The normal range for cylindrical power is less than 50 degrees.

In general, a prescription for eyeglasses includes indicators such as spherical power, cylindrical power, astigmatism axis, pupillary distance (PD), and vertex distance. The details are as follows:

1. Spherical Power: The spherical power indicates the degree of myopia or hyperopia, denoted by "S". The normal range for spherical power is from 0 to +50 diopters.

2. Cylindrical Power: The cylindrical power refers to the degree of astigmatism, indicated by "C". The normal range for cylindrical power is less than 50 diopters.

3. Astigmatism Axis: The astigmatism axis indicates the direction of astigmatism, represented by "A". This value exists only when astigmatism is present, and typically ranges from 0 to 180 degrees.

4. Pupillary Distance (PD): PD refers to the distance between the centers of the pupils of both eyes, denoted by "PD". The average normal PD is approximately 61 mm for adult males and about 58 mm for females.

5. Vertex Distance: Represented by "VD", this refers to the distance between the two eyes. The normal vertex distance for adult males ranges from 58 mm to 64 mm. Additionally, a "+" sign indicates hyperopia (farsightedness), while a "-" sign indicates myopia (nearsightedness). "R" stands for the right eye and "L" for the left eye. If any of these values appear abnormal, it is recommended to consult a doctor promptly for appropriate evaluation and treatment.

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