We're all guilty of quickly rubbing our glasses on our shirts or using a paper towel to clean the lenses. While these habits may seem harmless, they ultimately can end up damaging your frames. 1. Don't use your shirt (or clothing in general) to clean your glasses. The dust and debris on fabrics can scratch your lenses. 2. Don't use paper towels or tissues to clean your glasses. These materials are too rough for your lenses and can cause small scratches. Dish towels or other fabrics that can trap dust and debris may also scratch the lenses. 3. Avoid using household cleaning products to clean your lenses. Cleaning products usually contain harsh ammonia-based chemicals that can destroy the protective coating on your lenses. 4. Don't leave your glasses out on the bathroom counter when getting ready. Hairspray and beauty products can get on your lenses and damage the protective coating. 5. Never try to buff out a scratch. Attempting to buff your lenses will only result in more scratches and damage. Take your glasses to a professional if you have a scratch that you need to be removed. 6. Don't leave your glasses in the car on a hot or cold day. Extreme heat or cold can damage lens coatings and also may change the frame shape.
PD is the distance between your two pupils in millimeters. Having a correct PD on your glasses ensures that you are looking through the ideal spot in your lenses. If there is no PD on your prescription, you can check it with your doctor or measure it yourself.
Sphere(SPH) refers to the refractive correction in the prescription. Minus(-) values are for nearsightedness, and Plus(+) values are for farsightedness. If "PL" or "Plano" is written for the either SPH on your prescription, then you should select "0.00".
CYL(Cylinder) & Axis
Cylinder(CYL) refers to astigmatism. It can be either positive(+) or negative(-). Axis is recorded as an angle in degrees, between 0°and 180°. Therefore, if there is a CYL value on your prescription, then there must be an Axis for it.
If "DS" or "SPH" is noted for the either CYL on your prescription, it means you have no astigmatism.
The number sometimes written as "NV" or "Reading Addition" refers to near vision and is used for multifocal lenses and readers.
Prism is power, measured in diopters, used to correct vision displacement, like double vision or an eye turn. Most eyeglass prescriptions do not have prism correction. A prescription with prism will have two values per eye: a Prism (power) and Base (direction).
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