Q: What’s differences in optical frames thickness?
A: Plastic Lenses
Your glasses help you see better by bending, or refracting, light mainly because it passes through your lenses and into the eyes. Your eyeglass prescription determines the sunshine-bending ability of one's lenses. The potency of the prescription continues to be the same in each material but the thickness changes. Plastic lenses possess a refraction index of just one.498, meaning light travels 1.498 times faster in a very vacuum than it does through plastic lenses. Plastic lenses are lighter but slightly thicker than glass lenses.
Polycarbonate lenses have a very refraction index of just one.586, so this means the information is thinner than plastic or glass lenses. Polycarbonate is definitely a shatter-resistant material which is suitable for children because of the safety feature from the lenses; however a lot of people choose polycarbonate lenses with the lightweight properties and thinner lens.Besides this you should also know about the disadvantages of high index optical lens.
Hi-index lenses, as they are known, are about 50 percent thinner than plastic lenses. Hi-index lens material bends light more proficiently and it is available in different refraction indexes which range from 1.54 to 1.74 in america. The favourite hi-index material comes with an refractive index of just one.67 and is about half as thick as plastic lenses.
Glass lenses are slightly thinner than plastic lenses but about twice as heavy. The refractive index for crown glass, what kind accustomed to make eyeglass lenses, is 1.523.