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Lenses
Step 2
Now you have chosen a lens type let’s look at how thick the lenses are going to be. Click a link below to go to a calculator to work out the thickest part of your lenses.
Distance, Intermediate
and Reading
Varifocal
Bi focal
Office
A general rule to working out how much thinning your lens will require :
0.00 – 3.00: Standard thickness
3.00 – 6.00: 1.6 lens
6.00 – 8.00: 1.67 lens
8.00 – 10.00: 1.74 lens
10.00 and above – glass lenses
Here is an example of the effect of thinning on a plus and minus 4.00 lens:
Other Factors:
Size of Frame – The further your eye sits from the centre of the frame, the thicker the lens edge of the lens will be.
This process will be applied vertically if you go for a deep lens.
A big frame will require a bigger lens blank – this makes the lens thicker.
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