Posts Tagged ‘glasses lenses’

High-Index Lenses: Thinner and Lighter

July 29th, 2011

People suffering nearsightedness with strong prescriptions often find themselves caught up in a dilemma where they have to compromise style just so they can have the lenses of rx eyeglasses that meet their corrective need. They can only choose from a limited number of frame types to see clearly and lenses that are extremely thick at the edge are required and these lenses aren’t compatible with today’s fashionable frames that are becoming more and more thin and light as a trend. Fortunately, the invention of high-index lenses may solve this problem for them.

High-Index Lenses

As we know, rx eyeglass lenses correct refractive errors by bending light as it passes through the lens. The amount of light-bending ability (lens power) that’s needed to provide good vision is indicated on the eyeglass prescription given by your eye doctor. The bigger the prescription, the larger of a curve is needed to achieve the light-bending effect required, hence the more material it takes to make the lens and the thicker the edges of the lenses will be. Regular lenses for high amounts of nearsightedness or farsightedness can be very thick and heavy, making them not only a pain in the neck to wear but also incompatible with various types of frame styles. New “high-index” plastic lens materials however can bend light more efficiently, which means by using less material than their conventional counterparts, lenses made of this material can achieve just as much light bending effect. Thanks to this new technology, people with strong prescriptions don’t need to limit their choice of frames any more.
High-Index Lenses

To achieve the best vision and appearance, you’d better have your high-index lenses coated up with an anti-reflective lens coating, AKA AR coating. Lenses with this type of coating allows up to 99.5 percent of light reach your eyes so that you can have the optimum vision. Besides that, AR coating can eliminate reflections of light from the lens itself both internally and externally, making the lenses appear nearly invisible, so next time when others are looking at your eyes, the eyes won’t be flashed by the reflection from your lenses. You will see the rest of the world with a more clear and accurate vision and since the light goes both ways, the rest of the world will see a more fresh and confidant you.

Glasses lens coatings

March 14th, 2010

The technique of coating is used in the vast majority of glasses lens. Coating is a covering that is applied to the glasses lenses. The surface properties of glasses lens may be improved thanks to coating. Other advantages of glasses lenses also come from coatings, such as good appearance, adhesion, wear resistance and scratch resistance. In general, there are four types of coatings used in glasses lens.

Scratch-resistant coating treats the front and back of glasses lenses with hard coating and makes lenses more resistant to scratching. Currently, build-in scratch-resistant coatings are found in many types of plastic lenses, such as high-tech and polycarbonate. Glasses lens with this coating is relatively safer when dropped on the floor and cleaned with a paper towel. This kind of coating is suitable for kids glasses lens.

Over exposure to UV light may cause cataracts, retinal damage and other eye problems. So making your sunglasses protective from UV is critical. UV treatment on glasses lenses is the solution. You can simply apply UV treatment to most plastic glasses lenses. The UV treatment is invisible to the eyes.

Anti-reflective (AR) coating is capable of improving both the vision and appearance of glasses lens. AR coating can block both internal and external reflected light thus reduces the glare. This is a significant benefit of glasses lenses that provides a clear and complete view. Your eyes will look more natural with AR coating glasses lens.

The fourth type is mirror coating. Glasses lens with mirror coating are highly reflective. Many colors of mirror coating are available including blue, silver and gold. But these colors don’t interfere the vision that the wearer receives. Glasses lenses with mirror coating are usually for dressing.