If prescription is 8.4 BC, can a 8.7 ...

If prescription is 8.4 BC, can a 8.7 BC be worn without problem?

Posted in the Optometry Forum

Kev

Brownsburg, IN

#1 Sep 11, 2010
If my prescription has me wearing the Acuvue Oasys lens with a 8.4 base curve (comes in 8.4 or 8.8), would I wear the 8.3 BC (8.3 or 8.7) if changing to the Acuvue Advance lens?
If I wore Acuvue Advance with a 8.7 BC, could that cause any problem?
(Please don't suggest I ask my doctor, for there's a valid reason I cannot).
Thanks!
CT Optom guy

Glastonbury, CT

#2 Sep 13, 2010
Kev wrote:
If my prescription has me wearing the Acuvue Oasys lens with a 8.4 base curve (comes in 8.4 or 8.8), would I wear the 8.3 BC (8.3 or 8.7) if changing to the Acuvue Advance lens?
If I wore Acuvue Advance with a 8.7 BC, could that cause any problem?
(Please don't suggest I ask my doctor, for there's a valid reason I cannot).
Thanks!
1. It's hard to tell, as the answer depends on your corneal curvature measurements. Advance lenses fit a little differently than Oasys, so the only accurate way to see which BC fits better is for the doctor to see the lens on the eye and evaluate its centration and movement.

2. The 8.7 is a looser fitting lens. It might not cause a problem, or it might move excessively, causing discomfort. See answer #1

Bottom line is, you can't just arbitrarily change a contact lens Rx; the results can be unpredictable.
jas256

Omaha, NE

#3 Oct 13, 2010
As has already been stated, there's really no accurate way to tell unless you were able to provide either the curvature measurements or corneal mapping information.

Once again, this is why doctors have fitting fees. It's to make sure the lenses fit properly so that problems do not arise later.

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