WHAT IS ASTIGMATISM
Most all of the seven billion people of the world have some degree of astigmatism in their eyes.
Astigmatism is a component of your eyes refractive error or glasses prescription that simply means your eye is not a perfect spherical surface.
High amounts of astigmatism, just like a high prescription, can cause distorted vision with increased glare. People with a large amount of astigmatism prescription benefit greatly from BestSight HD lenses.
Types Of Astigmatism
The most common type of astigmatism. When prescribing for astigmatism glasses there are typically two principle meridians that are accounted for. In regular astigmatism, these meridians are 90 degrees apart from each other
With The Rule (WTR) Astigmatism
A regular astigmatism which the correcting axis in your glasses is 180 +/- 30 degrees.
Against The Rule (ATR) Astigmatism
The correcting axis in your glasses is 90 +/- 30 degrees.
This regular astigmatism is neither WTR or ATR. The glasses prescription correction cylinder has another value.
This form of astigmatism occurs when the principle meridians in one's eyeglass prescription are not 90 degrees apart. This is common in astigmatism caused by an eye condition such as Keratoconus, Pellucid Marginal Degeneration, or a large Corneal Scar from over-wearing contact lenses.