Titanium frames are very popular because they are lightweight, durable, strong, and corrosion-resistant. Titanium frame can be made in a selection of different looks, from modern to classic. They are also hypoallergenic, and they retain their shape better than other metals. They bend according to force but retain their shape due to the resistance alloy provides.
TR90 is referred to as plastic titanium, a memory polymer material frame. TR frame has lightweight and impacts resistance and high temperature. It is colorful and has no release of chemical residues. However, it is a little less durable than metal and may fade, burn, and lose strength over time.
Acetate is a nylon-based plastic, which means it’s very strong in addition to being lightweight. Acetate comes in many different colors, with a high, rich luster, and is produced in high quality, sandwiched sheets. The frame is stamped from these sheets and requires handcrafting to attain its final shape and appearance. The acetate frame is hard, glossy, and strengthens steel skin combined with a solid performance, appearance, and style. It is not easily deformed color and very durable.
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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