Eyeglass prescription explained
EYEGLASS PRESCRIPTION EXPLAINED
How can I tell what my vision problem is ?
This is quite simple to do by looking at your distance eyeglass prescription.
Your eyeglass prescription has a main number called the “sphere”.
If your sphere has a + sign, you are far-sighted or hyperopic.
If your sphere has a - sign, you are short-sighted or myopic.
If you have any astigmatism, the prescription will then have 2 more numbers:
the “cylinder” is the amount of astigmatism, and the “axis” describes its orientation.
Your prescription may also have a last number called the “add”.
This is the amount of bifocal you require to compensate for presbyopia.
The sphere, the cylinder and the add are measured in units called “diopters”.
The axis is measured in degrees.