Innovate every time because you understand the needs better. Ummy is crafted for the wearer to feelo, look amazing and not forgetting to see beyond the normal eye range. Its framework design is smart three-dimensional, stylish work. The texture gloss has anti-oxidation and not easy to fade. The comfortable leg is non-slip and no ear pressure. Ummy has a spring hinge suitable for all face shapes and anti-blue ray lens with high light transmittance to protect eyesight. It is made of alloy material and is available in 6 colors. There is a certain chromatic aberration in manual shooting of pictures.
-20.00 ~ +12.00
54 ~ 78
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PD (Pupillary Distance)
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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