What’s Corneal Astigmatism
Abnormal curvature related to the cornea with two axes of steeper and flatter curvature, which will result in abnormal focusing of light and impaired vision. This will typically result in curvature abnormalities of the front surface of your cornea.
Different Classifications of Astigmatism
-With the Rule: steep axis of the cylinder is within 15 degrees of the 90 degree vertical meridian (75-105 degrees)
-Against-the-rule: steep axis of the cylinder is within 15 degrees of the horizontal meridian (165-015 degrees)
-Oblique: steep axis of the cylinder is not within 15 degrees of the horizontal or vertical meridians (16-74 degrees and 106-164 degrees)
-The two main areas of the astigmatism are not symmetric that do not lie 90 degrees apart (orthogonal) which is considered irregular.
With most of us we will have decreased visual acuity. You may notice that straight lines are not exactly straight lines.