Difference between revisions of Axis
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Dlskidmore (talk | contribs) m (nuking "prescription" where that is not what is meant) |
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Axis is the orientation of the [[cylinder]] portion of your lens, used to compensate for [[astigmatism]]. You don't have an axis value if you don't have [[astigmatism]]. From the lens wearer's perspective, 0 degrees of axis is horizontal, and increasing values move clockwise around the eye. The axis of cylinder is symmetrical, so it only goes from 0 to 180 degrees. | '''Axis''' is the orientation of the [[cylinder]] portion of your lens, used to compensate for [[astigmatism]]. You don't have an axis value if you don't have [[astigmatism]]. From the lens wearer's perspective, 0 degrees of axis is horizontal, and increasing values move clockwise around the eye. The axis of cylinder is symmetrical, so it only goes from 0 to 180 degrees. | ||
Axis of astigmatism can be measured with a [[stenopaeic slit]] or [[JCC lens]] but the use of these tools is complex and easily misunderstood, it's usually best to get your axis off of your most recent [[prescription]]. | Axis of astigmatism can be measured with a [[stenopaeic slit]] or [[JCC lens]] but the use of these tools is complex and easily misunderstood, it's usually best to get your axis off of your most recent [[prescription]]. | ||