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Most glasses prescriptions are valid for up to 2 years, but some states require them to be renewed sooner. 2. Choosing the Right Lens Type Single Vision: For looking at one distance (near or far).

Eyeglasses (Glasses): How They Work & Types - Cleveland Clinic buy prescription lenses

This is the distance between your pupils. It is essential for ensuring the center of your lens matches the center of your eyes. You can ask your doctor for it or measure it yourself, though a professional measurement is preferred. Most glasses prescriptions are valid for up to

You cannot buy prescription lenses without a valid, current prescription. buy prescription lenses

Your eye care professional must provide a copy of your prescription (free in the US).