High Index Lenses

thin glasses set of attractive appearance and light bring comfort. Thinner and lighter high-index lenses are the ideal choice for carriers who perform these functions. A common feeling is that myopia correcting lenses are thicker at the edge and thinner in the center. Stronger regulations require thick lens edges. With the prevalence of breakthroughs and semi-rimless styles of eyeglass frames, those of conventional plastic or glass lenses edge thickness, are even more obvious, which may affect the appearance of eyeglasses.

The prescription of a lens is determined by the amount of refraction of light that your eye need myopic. A greater limitation requires the lens to bend more light to give a clear vision. For example, a person with a prescription of -5.00 diopters of refractive needs more light than an individual with a prescription -2.00. And less need stronger lenses thick lens edges. In fact, the myopia of most people is progressing with age, which means that the lens edge will also grow in the thickness.

high-index materials can bend light more efficiently, making lenses myopic slimmer margins than conventional plastic lenses with the same order. This efficiency can reduce material that is used for high-index lens, while ensuring correct nearsightedness enough. Thinner lenses in turn reduce the overall weight of the lens, so that the plastic lenses High index are lighter than conventional plastic lenses with the same vision correction effect. High-index lenses can also benefit from an aspheric lens design, making it flatter and enhance their appearance.

high-index materials have "refractive index." lens materials with higher refractive indices can make the lens thin, which explains why the high-index lenses are thinner. conventional plastic has a refractive index of 1.50 and that of glass is 1.52. high-index plastic and glass are now available with refractive indices between 1.53 and 1.74. Lenses of high-index materials are thinner than those made from materials with low index. It is estimated that a lens with an index of 1.70 can be at least 50% thinner than conventional plastic glass.

In fact, only the requirements of high need for high index lenses, materials and the highest index are generally higher for prescriptions. You must evaluate your prescription needs by deciding good high-index materials, because the lenses index higher cost of higher fees.

glasses of high index lens coatings Anti-reflective coating can transmit 99.5% of the light, which reduces light reflection from the surface of the lens. Consequently, the visual clarity can be achieved, which is advantageous for night driving. reduction of reflection makes even the high-index lenses appear thinner.

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