验光单怎么看？一起来解锁“视力密码”

Core Viewpoint - The article provides a detailed explanation of the components of an eye prescription, helping individuals understand the significance of various symbols and numbers on the prescription sheet. Group 1: Eye Identification - The prescription distinguishes between the right eye (R) and left eye (L), with R representing the right eye and L representing the left eye, which is crucial for accurate vision correction [2][3][4]. - Mixing up the data for the right and left eyes can lead to severe eye strain and worsen vision problems [5]. Group 2: Sphere Degree (S) - The sphere degree (S) indicates the degree of myopia or hyperopia, with a "-" sign representing myopia and a "+" sign representing hyperopia [6][7]. - The unit for sphere degree is diopters (DS), and a normal range for adults is ±0.50DS [8][9]. Group 3: Cylinder Degree (C) and Axis (A) - Cylinder degree (C) indicates the degree of astigmatism, while the axis (A) specifies the direction of astigmatism, measured in degrees from 0 to 180° [10][11]. - The unit for cylinder degree is diopters (DC), and a cylinder degree greater than 0.50DC typically requires corrective lenses [12][14]. Group 4: Spherical Equivalent (SE) - The spherical equivalent (SE) is a key indicator of overall refractive status, calculated using the formula: sphere degree + 1/2 cylinder degree [15][16]. Group 5: Pupillary Distance (PD) - Pupillary distance (PD) is essential for comfortable lens fitting, with a normal range for adults being 55-70mm [17][18]. - Accurate measurement of PD is critical to avoid discomfort and visual distortion [19]. Group 6: Important Reminders - The prescription data should be analyzed in conjunction with age, medical history, and visual habits for accurate assessment [20]. - Children require specific considerations for eye exams, including the need for dilation and frequent re-evaluations due to rapid vision changes [21][23]. - It is advised to retain the prescription for future reference, as it may fade over time, and to avoid purchasing glasses online without proper fitting [24][25].