How Are Contact Lenses for Astigmatism Different Than Regular Contact Lenses?
March 25th, 2010 | See the Top Answers to this Question Below
The reason I ask is because I was prescribed Acuvue Oasys lenses with a Base Curve of 8.6, but when I look for them they only come in 8.4 and 8.8. However, there are Acuvue Oasys for Astigmatism with a base curve of 8.6. Can I get those? Does that mean I have astigmatism?
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Lenses for astigmatism are non-spherical, so they are designed to sit in your eye at a specific orientation and not rotate (unlike standard lenses, which are free to rotate). Correction for astigmatism is noted in "axis" (anything greater than 0). Base curve is the curvature of the lens itself, which is adjusted to best fit the shape of your eye, so that alone doesn’t say anything about astigmatism. You should check with your optometrist/ophthalmologist to confirm the size – if it really doesn’t exist, then he/she will probably choose the next closest one, but you won’t be able to make that change yourself since it was not what was prescribed to you.
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The contacts have an "anchor" that keeps the lens in a certain position.