With the growing use of prescription glasses, people’s expectation on the prescription lenses have become higher and higher. A few years ago, there are only glasses and a hard resin called CR-39 can be used for prescription lenses. Recently, high index prescription lenses have become available. Although high index prescription lenses are more expensive than standard lenses, you should choose the high index prescription lenses due to their below advantages, especially when you have a strong prescription: 1. Bend light more efficiently. High index prescription lenses are made from the materials with higher index of light refraction, they are able to bend light to a much larger degree than the standard lenses. 2. Thinner. The high index prescription lenses have thinner edges than the standard lenses with the same prescription due to their … Read entire article »