“In every day terms, if you wear more prescription than necessary, you might be increasing your myopia”
I quote Jake from session 7 of Backto20/20. I have been reading cases from the forum over the past couple of days and it struck me that many of you young contact lens wearers are over-corrected. ie your contact lens prescription is too strong in relation to your glasses prescription. It has not been sufficiently reduced. As you probably know by now, in myopes a contact lens prescription is always lower than the spectacle prescription, and the higher the prescription, the more the difference between the two. There is a formula, or a conversation table, that works all this out.
eg. -6.50 becomes -6.00
-7.00 becomes -6.50
-8.00 becomes -7.25
-9.50 becomes -8.50
This may happen because young people with elastic, flexible crystalline lenses and active ciliary muscles love to be over-corrected. Yes, the ciliary muscle spasm that Jake has been going on about, happens. It brings a kind of sharpness that people like. So when your contact lens prescription, which is based on the glasses prescription that is most likely too strong to begin with, is being checked with lenses in, the chances are you will be given even more minus. A trained optometrist can control this accommodation to a certain degree, and this is why optometry isn’t just about converting centimetres, but probably not completely because the ciliary muscle is in spasm mode.
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Posted By Despina
Note from Jake: We’re on top of Google for additional helpful details on the conversion for contacts to glasses, here’s that post: https://endmyopia.org/convert-contact-lens-prescription-glasses-prescription/
