Spectacle Lens Guide and Eyewear Coatings from Frames Foundry
Once you are done with your eye test and you are holding a copy of prescription given by your optometrist, you may have wondered what those numbers actually mean. Learn all types of prescription lenses and eyewear coatings from Frames Foundry right here. From information about single vision lenses and varifocal lenses to lens coating and tints, we have got all your eyeglass needs covered.
There are 4 main lens indexes based on lens thickness. This easy guide will facilitate you to opt for the precise lens thickness. The thickness of a lens is represented as an index number.
Standard Lens 1.5
These are the standard plastic lenses used for low prescriptions (up to +/-2.00) in a fully rimmed frame. These lenses are lightweight, strong, durable, and are 100% UVB, 90% UVA protected. These are not suitable for rimless or semi rimless frames.
Thin Lens 1.6
These lenses are 20% to 30% thinner than standard 1.5 index lenses and good for medium prescriptions up to +/-4.00D. These are 100% UV protected and tough enough for all frame types; full rim, semi, and rimless.
Super Thin Lens 1.67
These lenses are up to 40% thinner than standard 1.5 index lenses and good for medium to high prescriptions up to +/-6.00D. These are 100% UV protected and work best in rimless and semi rimless frames.
Ultra thin 1.74
These lenses are up to 50% thinner than standard 1.5 index lenses and good for very high prescriptions of +/-5.00D and over. These are 100% UV protected, the thinnest plastic lens material available, and first choice for high prescriptions.
Varifocal lenses, also known as progressive lenses, contain two prescriptions, one for distance and one for reading. A gradual change in strength from the top of the lens to the bottom with multiple focal points in varifocal lenses allows seeing all distances and focus points through just one lens. There are 2 types of varifocal lenses which are explained below:
Standard Progressive Lenses
A progressive lens has optical aberrations towards the lower edge to the right and to the left. This is technically impossible to remove. These aberrations can vary greatly from person to person. Important is that a progressive lens is adapted exactly to the anatomy and the viewing behavior of its user, so that it can be optimally used.
Enhanced Progressive Lenses
Enhanced View progressive lens is 45% thinner than standard progressive lenses, for a better look and greater comfort. Vision clarity is increased by 30% to sharpen your vision and reduce your visual fatigue.
Polycarbonate is one of the strongest and safest materials on the market. They have excellent power and resilience. Glasses with polycarbonate lenses offer the highest degree of protection to keep your child's eyes out of harm's way while providing clear, comfortable vision. The polycarbonate material is a natural UV filter, blocking over 99 percent of the sun's damaging UV rays without the need for special lens coatings.
If you are looking for an exceptionally clear, lightweight lens material, Trivex lenses, which rival polycarbonate lenses as the safest lenses on the market, are your solution. Because of their superior tensile strength, Trivex lenses are less likely to crack at this connecting point than lenses made of polycarbonate or other lens materials.
Vista-Mesh lenses are the solution for those people who struggle with glare from bright lights at the work place or out shopping, computer screens at the office, and driving at night time. VISTA-MESH Lens have a micromesh filter built into the lens to cut glare and hence reduce visual stress. The fantastic lens technology of today enables the VISTA-MESH Lens to reduce eye strain, sharpen and enhance contrast, dampen flicker, align scattered light reflections and deflect EMI radiations.
Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic lenses include "light-adaptive lenses" and "variable tint lenses."
Bifocal lenses contain two optical corrections with a distinct dividing line between the two parts. The most common use of bifocals is for people who have become presbyopic and need a different prescription for close work. The upper part of the lens corrects distance vision and the lower half is for near vision. Trifocals are also available that have three sections and incorporate a correction for intermediate vision.
Scratch Resistant, Anti-Reflection
Lens coatings can enhance the performance and appearance of your eyeglass lenses. If you are thinking about purchasing new eyeglasses, here are lens coatings and treatments you should consider.
Lenses that are treated front and back with a clear, scratch-resistant coating have a much harder surface that is more resistant to scratching, whether from dropping your glasses on the floor or occasionally cleaning them with a paper towel.
Anti-Reflection coating is a microscopically thin multilayer coating that eliminates reflections from the front and back surface of eyeglass lenses. By doing so, AR coating makes your lenses nearly invisible so people can focus on your eyes, not distracting reflections from your eyeglasses.
When it comes to different lenses for your reading glasses, who knew there were so many options? If you are thinking about purchasing new eyeglasses, here are lens tints you should consider.
Make any of your favorite frames into sunglasses with dark tints, available in brown, green and grey. Dark tints provide approximately 85% light absorption, include 100% protection from the sun’s damaging UV Rays, and are ideal for everyday use.
These bright colorful tints are great fun and stylish but are cosmetic only and provide no protection against UV in sunlight. Light tints provide approximately 45% light absorption.
Polarised lenses offer both a stylish look and protection from harmful rays by filtering out reflected glare. These lenses Block out 99.7% of glare from reflected light, ideal for driving include 100% protection from the sun's damaging UV rays, and ideal around water and snow, perfect for coastal holidays and water activities.