How to read an eye examination report

Oct 26, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

In general, a vision prescription should be interpreted by looking at indicators such as spherical power, cylindrical power, axis of astigmatism, pupillary distance, and equivalent spherical power. The spherical power, denoted by "S", indicates the degree of myopia or hyperopia. The normal range for spherical power is 0 to +50 degrees. Typically, a plus sign (+) indicates hyperopia (farsightedness), while a minus sign (-) indicates myopia (nearsightedness). The cylindrical power, denoted by "C", represents the degree of astigmatism.

In general, a vision prescription should be interpreted by examining indicators such as spherical power, cylindrical power, astigmatism axis, pupillary distance (PD), and equivalent spherical power. The specific details are as follows:

1. Spherical Power: Represented by "S," this indicates the degree of nearsightedness or farsightedness. The normal range for spherical power is 0 to +50 diopters. A plus sign (+) typically denotes farsightedness, while a minus sign (–) indicates myopia.

2. Cylindrical Power: Represented by "C," this indicates the degree of astigmatism. The normal range for cylindrical power is within 50 diopters.

3. Astigmatism Axis: Represented by "AD," this refers to the direction of astigmatism, measured from 0 to 180 degrees. The normal values for astigmatism axis are 180°, 90°, and 45°.

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

5. Equivalent Spherical Power: Represented by "SE," this converts astigmatism into a spherical power with a similar optical effect. The normal range for equivalent spherical power is –0.25D to +0.25D.

In addition, "R" stands for the right eye, and "L" stands for the left eye. If any vision abnormalities occur, it is recommended to consult a professional promptly for appropriate diagnosis and treatment.

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