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#4527716 - 09/27/17 04:19 PM BASE CURVE?
Eddie Offline


Registered: 12/07/03
Posts: 9569
Loc: Florida, Cape Coral
What is meant by a "BASE CURVE" when buying sunglasses? Some models are base curve 6 and others are base curve 8. Might this be the radius of the classes if laid on a piece of paper and a circle drawn where the lenses are part of that circle? Ed
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#4527720 - 09/27/17 04:26 PM Re: BASE CURVE? [Re: Eddie]
skyactiv Offline


Registered: 03/02/13
Posts: 4397
Loc: The Midwest
Might be the lens spacing. My wife eyes are spaced further apart than the average woman and she can't buy any old sunglasses.
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#4527728 - 09/27/17 04:43 PM Re: BASE CURVE? [Re: Eddie]
chemman Offline


Registered: 02/19/07
Posts: 70
Loc: Maryland
Base curve is the actual curvature of the lens as measured from the inside of the lens using an instrument called a lens clock. The flatter the lens, the lower the base curve number. Hence a lens base curve of 6 is "flatter" than a lens base curve of 8.

Some people who wear glasses are extremely sensitive to the base curve of a lens. Having the wrong base curve and throw off an otherwise correct and accurate lens prescription (it has happened to me a couple of times).
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#4527889 - 09/27/17 07:50 PM Re: BASE CURVE? [Re: Eddie]
Eddie Offline


Registered: 12/07/03
Posts: 9569
Loc: Florida, Cape Coral
Thanks chemman. These are not prescription so base curve is not so important? Ed
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#4536496 - 10/07/17 08:19 PM Re: BASE CURVE? [Re: Eddie]
chemman Offline


Registered: 02/19/07
Posts: 70
Loc: Maryland
Maybe, maybe not. You need to try them to make sure. In my wife's case, it's extremely important.
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