Contact lenses, different numbers

[oilandwater]

Hi, Does anyone know what the difference would be in the following sizes please.

After my latest check-up my lens size now is;- 8.6 14.0 +1.50

I used to have an astigmatism but this has been corrected an is now marginal.

Pre astigmatism my lens were 8.6 14.6 +1.50

I don't know what part of my eye this measurement relates to, so is it OK to still use these as I don't want to damage my eyes? (I think I may have answered my own question there).

Thank you.

[davepoth]

The 14/14.6 is the diameter of the lens in millimetres, I believe. Functionally it shouldn't make a great deal of difference. The only reason I can think of for having a larger lens would be to ensure that it was stable on the eye in the correct orientation, since toric lenses (the ones for astigmatism) are lop-sided. So that shouldn't make too much of a difference. It may be that you've switched brands and the new, non-toric brand comes in a smaller size as standard.

-edit-

Although thinking about it, the guy with the chart with letters on who gave you the prescription would probably be the best guy to ask about this, rather than a bored bloke on the internet.

[oilandwater]

davepoth said:

The 14/14.6 is the diameter of the lens in millimetres, I believe. Functionally it shouldn't make a great deal of difference. The only reason I can think of for having a larger lens would be to ensure that it was stable on the eye in the correct orientation, since toric lenses (the ones for astigmatism) are lop-sided. So that shouldn't make too much of a difference. It may be that you've switched brands and the new, non-toric brand comes in a smaller size as standard.

Thank you, that makes great sense.

[DKL]

I can't think of a lens with a 14.6 diameter. More likely that (if you are taking these from a prescription not a lens box) that someone has misread the 0 for a 6.

[davepoth]

DKL said:

I can't think of a lens with a 14.6 diameter. More likely that (if you are taking these from a prescription not a lens box) that someone has misread the 0 for a 6.

I have only a little knowledge of these, but 14.6mm diameter did come up when I googled it.

https://www.google.com/#hl=en&output=search&am...

[oilandwater]

DKL said:

I can't think of a lens with a 14.6 diameter. More likely that (if you are taking these from a prescription not a lens box) that someone has misread the 0 for a 6.

These new lens work well don't they ......I miss read it, it should read 14.2 sorry.