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What if My Base Curve is Off?

This is a discussion on What if My Base Curve is Off? within the General Eye Health forums; If my contact lenses have the wrong base curve, are there specific signs I should ...


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Old 12-10-2007, 03:44 PM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 374
Default What if My Base Curve is Off?

If my contact lenses have the wrong base curve, are there specific signs I should look for? Is it different for a tight fit verses a loose fit?
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Old 10-17-2008, 03:17 PM
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Join Date: Oct 2008
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Default how to determine your base curve

You've probably been told that before you can get contact lenses, you must see your doctor and acquire your keratometry measurements (base curve). What many don't know, is that this is actually quite arbitrary, as it only represents the very smallest, apical part of the central cornea's curve, and doesn't represent how the lenses will fit over the rest of your eyes. It is at the perimeter of your cornea that dictates how healthy, and how comfortable, and hence how successful of a fit you will receive. The old trick, fit your contacts like Texas. Large, and flat. The larger the overall diameter, and flatter the base curve however, the less comfortable. So the give and take is, try to fit as large and flat as you can before you have contact lens sensation. So, a 14.2 diameter, with an 8.8 basecurve, if tolerated, will always be healthier than a 13.8, 8.4 basecure (if given the choice.)
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Old 10-17-2008, 04:08 PM
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Join Date: Dec 2007
Posts: 374
Default how to determine your base curve

Quote:
Originally Posted by imageoptometry View Post
You've probably been told that before you can get contact lenses, you must see your doctor and acquire your keratometry measurements (base curve). What many don't know, is that this is actually quite arbitrary, as it only represents the very smallest, apical part of the central cornea's curve, and doesn't represent how the lenses will fit over the rest of your eyes. It is at the perimeter of your cornea that dictates how healthy, and how comfortable, and hence how successful of a fit you will receive. The old trick, fit your contacts like Texas. Large, and flat.
You don't say. That's very interesting, imageoptometry. Thanks for your informative post.

You know what they say about Texas: "Texas is great. For miles and miles they've got nothing but . . . miles and miles."
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Old 12-27-2008, 03:56 PM
Contact Lenses Forum - Freshman
 
Join Date: Oct 2008
Posts: 2
Default What if My Base Curve is Off?

For my patients that wish to do their business on the net, I recommend they follow my old trick aforementioned in my last posting: "fit your contacts like Texas. Large, and flat. The larger the overall diameter, and flatter the base curve however, the less comfortable. So the give and take is, try to fit as large and flat as you can before you have contact lens sensation. So, a 14.2 diameter, with an 8.8 basecurve, if tolerated, will always be healthier than a 13.8, 8.4 basecure (if given the choice.)" The problem is if you get your lenses then find they are uncomfortable, you're stuck with 'em. So any $$ you could have saved is now gone, I suppose you could consider it a fitting fee?? There are a few sites out their that will exchange, for eg.:

Last edited by LENS101; 12-29-2008 at 02:44 AM.. Reason: removed promotional link
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Old 01-27-2009, 11:16 PM
Contact Lenses Forum - Bachelors Degree
 
Join Date: Dec 2008
Posts: 624
Lightbulb

Make sure that they fit I before going ahead and getting them. It is better to be safe than sorry.
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