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BC of lens

This is a discussion on BC of lens within the General Contact Lens Care and Questions forums; So currently, I am prescribed biomedics 38 contact lens . The BC for my current ...


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Old 07-26-2010, 09:46 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2010
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Default BC of lens

So currently, I am prescribed biomedics 38 contact lens. The BC for my current lens is 8.6. I was looking online and wanted to try Acuvue 2 since they seemed better/cheaper online. The only issue is that the BC for Acuvue 2 is 8.7. How would this affect my eyes?
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Old 07-27-2010, 06:45 AM
Contact Lenses Forum - Ph.D.
 
Join Date: Nov 2009
Location: near Hamburg, Germany
Posts: 2,144
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Originally Posted by Shanker View Post
So currently, I am prescribed Biomedics 38 contact lens. The BC for my current lens is 8.6. I was looking online and wanted to try acuvue 2 since they seemed better/cheaper online. The only issue is that the BC for Acuvue 2 is 8.7. How would this affect my eyes?
Hello Shanker and welcome to the forum

A difference of 0.1mm in the base curve is unlikely to make much difference for a soft lens, unless you are already at the border line end of the base curve fit for your own eyes.

But, you really need to have your contact lenses fit checked by a qualified eye care specialist to ensure that the lenses float properly on the eye and ensure that the tear film pumping is adequate to provide oxygen to the eye (in addition to the oxygen that permeates through the actual lens itself). If not a proper fit, you could damage your eyes.

A question. Why do you want to change to Acuvue 2 lenses? They are made of Etafilcon A and although better in oxygen permeability (Dk) than Biomedics, they are hardly the state of the art lens materials made from silicone hydrogel. I would suggest that you consider one of the monthly silicone hydrogel lenses (air optix, Biofinity, etc. etc.) Your eye care specialist should be able to recommend a suitable lens to you.

You don't have to buy your lenses from your eye care specialist. They have to give yo your prescription on demand and you can use this to buy your lenses on-line, etc. You will have to pay an eye care examination fee as usual of course. If you live in N America you will need a written prescription (for your new lens type) from your eye care specialist in order to buy on-line anyway.

knotlob
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Old 07-27-2010, 11:59 AM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 279
Default Do What's Best For You

Quote:
Originally Posted by Shanker View Post
So currently, I am prescribed biomedics 38 contact lens. The BC for my current lens is 8.6. I was looking online and wanted to try acuvue 2 since they seemed better/cheaper online. The only issue is that the BC for Acuvue 2 is 8.7. How would this affect my eyes?
The difference between 8.6 and an 8.7 base curve is probably not significant, but if you want to switch brands you will still need a prescription. If you buy from reputable supplier like lens.com, they will contact your eye doctor and conform your prescription and ask if it's okay for you to wear lenses with an 8.7 base curve. Just because the lenses are cheaper doesn't mean they're good for you. You don't want to cut corners when it comes to contact lenses. It would be best if you got contacts from Lens.com that fit your eyes properly.
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