CR-39 lenses: CR-39 lenses have refractive index of 1.5 and are recommended for low-to-moderate as +/- 0.00 to +/- 2.50. If your prescription is higher than this you can prefer thinner lenses, these are called Hi-Index lenses(1.6/1.67/1.74).
Polycarbonate Lenses: Polycarbonate lenses with refractive index of 1.59 are high impact-resistant lenses. They are 30% thinner than CR-39 lenses, are recommended for rimless frames, children's and sporting activities. These lenses are recommended for prescriptions ranging from 0.00 to +/-4.00. If your prescription is higher than this you can prefer Hi-Index lenses (1.6/1.67/1.74).
Hi-Index lenses: These are 30-50% thinner than standard CR-39 lenses and are available in 1.6, 1.67 and 1.74 these lenses are of choice for those with high prescriptions above +/- 2.50
Scratch resistance Coating : This can be applied to your lenses in order to resist scratches. The coating is not 100% scratch proof, it does help to prevent minor scratches that can damage the surface of the lens.
UV Coating: It provides superior protection to the eyes.
Overexposure to UV light may cause cataracts, retinal damage, and many other eye problems.
Polycarbonate lenses have an inherent UV protection material property
- Increases Light transmission.
- Improves contrast and clarity of vision.
- Minimizes visible reflections of light on the lens.
- Reduces eye strain.
- Better cosmetic look.
- Ideal for computer users and night driving.
Photochromic lenses: These are also known as Day and Night glasses, clear indoors, becomes dark when exposed to sunlight (UV rays). Photochromatic lenses will darken depending on the direct exposure to light.
Polarized Sunglass Lenses: Sunlight is reflected or absorbed in horizontal, diagonal, or vertical directions. Polarized sunglass lenses have a laminated surface that contains only vertical stripes, and only vertically-polarized light will be allowed to enter the person?s eyes. The glare will then be eliminated because any horizontally-polarized waves of light will not be able to bypass the polarized filter.
Lens Focal types:
Single vision lenses: These are the lenses with single power through out the lens for distance or near
Bifocal lenses: These lenses contains two powers, divided by a line, upper portion is for distance vision, lower portion is for near vision
Progressive lenses: It looks like single lens, but has multiple powers in that, power gradually increases from top to bottom.
How Do I Look for Frames that are Eligible for Multifocal Lenses? The easiest way to look for frames that are eligible for multifocal lenses is to use our filters in "frame focal type"
Once you've found your desired frame, ordering your glasses is easy! Click on the "Select Lens" button Then select "progressive" or "bifocal" depending on your preference.
Adding the Prescription Your prescription may come in a few different formats - but your bifocal or progressive prescription will always contain a set of numbers in the additional value (ADD) or near vision (N.V.)
Adding your prescription online is easy! It's just like inserting your single vision prescription but you will be adding your additional value as well! Remember to add your PD in the appropriate fields.
Need Help?If you're having problems reading or inserting your prescription, contact us at +91 924 766 6000! Our optical experts are happy to help you. You can also read more information on our prescription guide.