A Guide to purchasing Prescription Eyewear

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Is you prescription Plus or Minus ?

This can make a real difference to the way your lenses will look in your chosen frame.

Plus lenses are thick in the middle and thin on the edge, if you choose a larger frame the edge thickness should remain the same but the centre thickness will be thicker than a smaller frame and the lens will be heavier as it contains more mass.

Minus lenses are thin in the middle and thick on the edge, if you choose a larger frame the centre thickness should remain the same but the edge thickness will increase and the lens will be heavier as it contains more mass. 

As prescriptions become higher both these issues (Both plus and Minus) are exaggerated and are more noticable.

in short the smaller eyesize frame that you choose the better your lenses will look cosmetically.

There are other options available that help with these issues. Lenses can be made of different types of materials that have higher indexes. We call them high Index lenses they are thinner than basic lenses and the basis rule is that the higher the index the thinner the prescription will be. The basic lens material has an Index of 1.498 .

Other Indices available are as follows.

1.566
1.61
1,74

Remember the higher the index the thinner the lens ! Also the higher the index the more expensive the lens, you are paying for greater technology !
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