1. Description of commonly used professional terms:
| Abbreviations and full names | Full name | Description |
| R（Right）or OD | Right eye | If the left and right eyes have different refractive powers, please pay attention to the distinction |
| L（Left）or OS | Left eye | |
| S（Sphere） | Ball mirror | Myopia or hyperopia degree |
| C（Cylinder） | Cylinder | Degree of astigmatism |
| A（Axis） | Axis | Direction of astigmatism |
| VA（Vision） | vision | The clarity of the object |
| PD（R）、PD（L） | monocular PD | The distance from the center of the pupil of the left and right eyes to the center of the bridge of the nose |
| PD（R+L） | Pupillary distance | The distance between the pupil centers of the left and right eyes. Generally, the PD on the optometry sheet means the pupil distance of both eyes |
How to read a prescription for an eye exam?
What do the terms “OD” and “OS” mean in ophthalmic examinations?
“OD” and “OS” are abbreviations of oculus dexter and oculus sinister, which are Latin words for the right and left eye. You may also see the abbreviation OU on prescription medications, which means “two eyes”. Some doctors and clinics may use the more modern terms “RE” and “LE”, which mean “right eye” and “left eye ”
How long is an eye exam prescription appropriate?
Eyeglass prescriptions usually expire after two years, although some cases require a shorter expiration time. Contact lenses usually expire after one year.