What do the codes on glasses mean?

The numbers beneath the frames reflect the SIZE MEASUREMENTS in millimeters (mm). THE FIRST NUMBER (ex.54) = the width of the lenses. THE SECOND NUMBER (ex.15) = the distance between the lenses. THE THIRD NUMBER (ex.140) = the length of the temple arm including the portion going behind the ear.

What is NPD in glasses?

This means that your pupil distance for distance vision (or DPD) is 67, and for near vision (or NPD, for reading eyeglasses or multifocal lenses) is 64. Your near vision pupil distance is almost always 3mm less than your distance vision pupillary distance measurement.

What is DV and NV in glasses?

DV is an abbreviation for distance vision. This number indicates whether you have nearsightedness or farsightedness. NV stands for near vision, or the amount of power that needs to be added to make reading easier. OD means oculus dexter, or your right eye.

How do you read glasses measurements?

If you look on the inside of your glasses, you’ll find a number that looks like: 52 18 135. This information shows you the size of your glasses: the lens diameter, the bridge width and the side length — all measured in millimetres. The length of the side is usually one of three standards — 135, 140 or 145mm.

What does PD 63 60 mean?

PD for distance vision
You might be given two numbers such as 63/60. This would mean that you use 63 as your PD for distance vision. The smaller number would be used only when converting the prescription to single vision reading glasses and multifocal lenses.

What does RT and LT mean in eye prescription?

Sometimes a prescription will include the letters “OU,” oculus unitas, meaning both eyes. While using the Latin abbreviations is traditional for eyeglass prescriptions, some doctors have started modernizing their prescriptions by using RE (right eye) and LE (left eye).

What does CYL and SPH mean?

Your optical prescription Here is a simple guide to it means: Sph (sphere) represents how long or short sighted you are. This can be positive (+) for long sight or negative (-) for short sight. The higher the number, the stronger your lens. Cyl (cylinder) represents the amount of astigmatism present.

What does sphere cyl and axis mean?

‘Sphere’ is basically a measure of how strong your prescription needs to be. The number marked ‘axis’ describes the orientation of astigmatism. It will be a number between 1 and 180. The number under ‘cylinder’ provides the lens power needed to correct the astigmatism.