Help & Information > FAQs > Lenses
    Articles in this section
    What is the material of your lens?
    Difference between Spherical Lens and Aspherical Lens
    Lens Functions
    What're the difference between Tint lens, Photochromic lens and Polarized lens?
    What is the difference between single-vision and progressive lenses?
    Can you replace lenses if I send you my frame?
    What lens tint is right for me?
    What are Polarized lenses?
    What do the Lens Index numbers mean?
    How to replace lenses?
    What is the difference between photochromic and Polarized lenses?
    How to choose the lenses thickness? What is the relationship between lenses thickness and the refractive index?

Lens Functions

1. Single vision lens

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.

2. Bifocals

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.

3. Progressives

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.



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