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Figuring out what all of those numbers and letters on your prescription mean can be a little tricky, but we've got that covered. Come check out our tuto...

PD, or pupillary distance, is the distance in millimeters between the center of one pupil to the other measured in millimeters. Your PD is usually included ...

If you have a glasses prescription with an NV-ADD, it is best to order Prescription Reading Glasses. If you do not have a glasses prescription and typically...

You can do it yourself or have someone else measure it using a mirror and a ruler. Place a ruler, millimeter side up, directly under the center of your righ...

Contact prescriptions and eyeglasses prescriptions differ and using them interchangeably will result in problems with your glasses. Make sure you have the c...