- Lenses and Options
The lenses you choose for your eyeglasses are even more important than the frames of the eyeglasses, as these are the deciding factor in determining your satisfaction with your eyewear. Plus, with so many different choices of lenses available these days, choosing lenses can be confusing, tiresome and even daunting.
What do the Numbers on Lenses say?
The numbers on the lens of your eyeglasses denote its refractive index, which is basically a relative measure of how efficiently the lens material bends light passing through the lens. For a given eyeglass lens power, a lens made of a material with a high refractive index will be thinner than a lens made of a material with a lower refractive index. Refractive indexes of contemporary eyeglass lens materials range from 1.498 to 1.74, with 1.498 being the refractive index for a lens made from CR-39 plastic, and 1.74 being the refractive index for a lens made from a specific variety of high-index plastic high-index plastic lens. Also, CR-39 plastic lenses will be the thickest, and 1.74 high-index plastic lenses will be the thinnest lenses available.
Focusing on Multifocal Lenses
Normally, people with either nearsightedness or farsightedness opt for single focus lenses to overcome their disability. However, those with both near and farsightedness often require eyeglasses with multifocal lenses.
- Single Focus Lenses
Single Focus Lenses are prescribed if you need correction for only one field of vision, either distance, intermediate or near.
- Bifocal Lenses
Bifocal Lenses contain two different prescriptions with the top area of the lens for distant viewing, and the lower segment area of the lens for close viewing.
- Trifocal Lenses
Trifocal Lenses contain three focal points, usually for distance, intermediate and near vision, with an added segment above the bifocal for intermediate viewing.
- Progressive Lenses
Progressive Lenses have no visible lines as well as multiple focal areas, unlike bifocals or trifocals. They provide seamless transition from distance vision on the top, to intermediate vision, to near vision at the bottom.
Different Lenses from Different Materials
When choosing the material for the lens of your eyeglasses, it is suggested to have a clear idea of how, where and why you need to use the eyeglasses. The ideal material for your lens will depend not just on your prescription but also on your prospective usage of the eyewear.
Plastic lenses are one of the most common and economical lenses available. These lenses are reasonably comfortable, with plastic providing excellent optics and vision correction. However, they are also prone to scratches and marks, and hence scratch-resistant coats are suggested to be applied on these lenses. Plastic lenses are suggested for light prescriptions, ranging from no correction to +/-1.75.
Polycarbonate lenses are thinner, lighter and up to 10 times more durable than regular plastic lenses, and they also offer total protection from ultraviolet radiation. These lenses are recommended for people with prescriptions ranging from +/- 2.00 to +/-4.00, and for children under 18 years of age or pretty much anyone who has an active lifestyle, due to their impact-resistive attribute.
With the material having been originally developed for the military, lenses made from Trivex bring together lightweight comfort, strength and protection, and most importantly crisp and clear vision, for you. Moreover, lenses made of Trivex will provide optimal optical performance for nearly every prescription and can be used by anyone and everyone to get the most out of their eyewear.
High-index lens materials have revolutionized the world of eyeglasses. Thin and eye-catching, light and comfortable, durable and UV resistant, these lenses are very popular nowadays. Hi-Index lenses are considerably thinner than plastic lenses and help overcome the ‘bug-eye’ effect of traditional eyewear. They are recommended for people with prescriptions of +/- 2.00 and greater.
Coating Your Lenses Perfect
We offer a wide range of eyeglass lens coatings with our high quality eyewear and lenses, including:
Anti-reflective (AR) coating eliminates reflections in lenses, helps protect your lenses from scratches and smears, and repels dust and water. Itreduces eyestrain, makes your vision sharper and your eyes appear clearer behind your lenses. With AR-coated lenses, you are also much less likely to have glare spots in photographs.
- Photochromic / Transitions®
Photochromic or Transitions® lenses darken automatically in response to sunlight, and return to their clear tone while indoors, thus removing the need for separate sunglasses. Due to this ability, photochromic lenses have become a popular choice for people of all ages.
Scratch-resistant coating help prevent scratches from damaging your lenses and messing up your vision. The coating reduces everyday wear and tear and so increases the life of your lenses.
- UV Protection
Exposure to the ultraviolet rays of the sun can cause serious eye problems, and hence it is pertinent to protect your eyes from such rays. The UV protection that is applied as a coating blocks these harmful ultraviolet rays from reaching your eyes.
Adding Tints of Expression
Sometimes a light or dark hint of color on the eyeglass lens can be beneficial to aid in vision and also help you look your Sunday best. In case you feel like transforming your eyewear into dark shades, choose a standard 80% tint, or a Polarized 85% or 90% tint. For light sunglasses, you can confidently go with a 50% tint. If you just want a light touch of color to make a fashion statement or for eyestrain, you can choose a 10% tint.
The lens you choose for your Eyeglasses from Eyeweb have a great deal of impact on what kind of vision you are looking for and what kind it will be. There are plenty to choose from depending on the Prescription your eye doctor has written out for you. You are able to choose Prescription Eyeglasses with single, bifocal, trifocal and progressive lenses. You are also able to choose from different types of materials for your Eyeglasses like plastic, polycarbonate, trivex and Hi Index. Then there are additional options you can choose from which can provide extra protection like Anti-reflective, Transitions, Anti scratch and UV Protection.