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What is the difference between thin lenses and extra thin lenses?

April 26, 2017answer difference extra Health lenses optical

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What is the difference between thin lenses and extra thin lenses?

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The thin lenses are measured by their index of refraction… Regular lenses are 1.49 Next step up is the 1.56 , which is 28% thinner than the 1.49 Polycarbonate at 1.58 is pretty well the same as the 1.56 Then the 1.6 which is 40% thinner than the 1.49 Then 1.67 which is 13% thinner than the 1.6 Then the 1.74 which is about 10% thinner than the 1.67 But, there are limitations as to which one will work best for certain prescriptions. With a + 3.00 that you have, you should be no higher than the 1.6 The 1.67 is not recommended under +/- 6.00 The 1.74 is not recommended under +/- 8.00 If the index is too high it causes all kinds of problems with distortion. Being a + power, you will always have some of that magnifying effect, but the 1.6 with a good anti reflection coating and a small frame should be pleasing to you.