How do plastic high index lenses work?

lenses with high index made of special plastic allow thinner, lighter lenses than traditional glass or plastic. These lenses are focused on those who have very strong recipes, both short -sighted and far -sighted. Goggles correct vision by bending the light that passes through them. A stronger regulation requires more bending than weaker, resulting in a stronger lens. The high index lens is made of thicker material than conventional, bends more light with a smaller thickness, resulting in ultra -thin, light glasses. The lenses are stronger at the edges than in the middle. The stronger the prescription, the stronger the edges become.

Most stylish images are too thin to hide the strong edges of short -sighted lenses. Strong lenses also distort their eyes, so they look unnaturally small. Lenses with high index eliminate both problems have lenses that are stronger in the middle, with thin edges. The strong center has the opposite effect of a short -sighted lens, so the eyes look unnaturally large. These thicker čThe eyes again offer a solution. This index compares light lights through air and lightspeed through the lens material. The glass bends the light at an index ratio of 1.52, while the conventional plastic has an index of 1.50. Lenses with a larger index are considered a high index.

There are now several plastic materials with an index ratio between 1.53 and 1.71. The higher the index, thinner, lighter and more expensive lenses. There are also lenses with a high index , with a ratio of 1.90. However, glass lenses are not as light or durable as plastic lenses. In fact, glass with a high index is actually more severe than standard glass, the abolition of most benefits from a thinner lens.

high index lenses can correct astigmatism and are available as bifocal or trifocals. They look nice in thin, wire and "frameless" frames. The index that will best suit you is your preiiHere, but do not assume that the seller will make the best choice for you. Some suppliers do not sell all types and you could end up with a lower index lens than ideal. Ask your optometrist who the index is the best.

This type of lens is available from many optical centers. They can make glasses more pleasant, improve self -confidence and restore trust. They are resistant and resistant to broken, ideal for children and active adults. After wearing a few high index lenses, it is likely that you will never return to standard glasses.