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Nowadays, prescription glasses are considered as one of the most widely used instruments to help people to correct various kinds of eye vision problems, such as myopia, presbyopia or astigmatism and so on. When choosing prescription glasses , the frame and lenses might be the most important aspects you should take into consideration.
Generally speaking, frames for prescription glasses can mainly classified into three basic styles, including full frames, half-rim and rimless ones. Full-rim frames are the most traditional ones which have two round circles to wrap around the respective prescription lenses. And the lenses for half-rim prescription glasses are half covered by the eyeglass frame which has only two half circles. With the assurance of safety, more and more people would appreciate the benefits of rimless eyeglasses. Prescription eyeglasses users can benefit lightness from rimless eyewear since they are only comprised of the lenses themselves, the nosepiece and very thin support arms.
When it comes to the frame materials for the prescription glasses, there are many options available in the modern market. In detail, prescription glasses frames which are made of metal or alloys are usually heavier than those comprised of plastics. In the scope of metal category, monel, titanium and aluminum are all optional materials. And each of them has its own features. For example, prescription glasses frames made of monel are corrosion-resistant and malleable. And the most prominent feature for titanium frames are lightweight, durability, strength and bendable. Compared with metal prescription glasses, plastic frames are strong, impact resistant, and completely hypo-allergenic.
As to the lenses for the prescription glasses, the earliest and traditional material is glasses. But it is gradually replaced by the plastic lenses due to its weight. Plastic lens is a very lightweight and durable material and CR-39 as a special plastic has been the standard material for eyeglass lenses for many years. Polycarbonate lenses which are the lightest and most shatter-resistant than any other lenses are now has been widely used among the prescription wearers. And if the power of your prescription glasses is very high, high index lenses which will make the glasses thinner and lighter may be the best choice for you.
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