Single-vision prescription lenses are for people who need to correct one field of vision, either for distance, intermediate (computer), or near vision (reading). They contain the same amount of vision correction throughout the entire lens. There is no ADD in the prescription in the single vision prescription and there are no lens height requirements for single vision prescription.
Bifocals (sometimes called “lined bifocals”) contain two prescriptions within the same lens and can correct both nearsightedness and farsightedness. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision. The zones are separated by a noticeable line.
Progressives are multifocal lenses that contain at least three prescriptions. They have three main fields of vision, including near, intermediate, and distance. However, progressives do not have a visible line between prescriptions. This gives the wearer a seamless and uninterrupted transition when looking from up-close objects to far-away distance.Advanced Progressive lens Advanced Progressive lenses are the most popular type of high definition lenses and are made by free form technology that can allow you to achieve better optics. The progressives are added on the backside of the lens to enlarge visual fields and minimize the uncomfortable effects. Comparing with the standard progressive lens, Advanced Progressive lenses are easier to be adapted to.
4. Computer lens
The lenses of computer glasses are designed to deal with eye strain caused by computer screens. Computer glasses help with an intermediate distance of around 20 to 26 inches, which is the distance most people sit from their monitors. Many computer glasses have light yellow/brown tinted lenses to block out blue light radiating from your electronic devices.
5. Reading glasses
Reading glasses are made primarily for presbyopia which is an age-related eye disease most people experience around 35 to 45 years of age. Presbyopia is caused by a decreased elasticity in the eye's lens, making it more difficult to focus on objects in a close range.
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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