IMPORTANCE OF ROTATIONAL STABILITY AND TEAR FILM STABILITY IN TORIC CONTACT LENS WEARERS.
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IMPORTANCE OF ROTATIONAL STABILITY AND TEAR FILM STABILITY IN TORIC CONTACT LENS WEARERS.
Astigmatism occurs when light entering the eye does not converge at a single focal point in the back of the eye, but instead focuses at two different locations.1 Visually, this causes images to appear smeared / elongated, due to the distance between these points, and degrades vision at both distance and near. The most common cause is due to a non-uniform corneal surface, where the curvature is greater in one meridian (plane) than the other but can also be caused by the crystalline lens of the eye.1 Visual correction for patients with astigmatism requires different optical powers in two different meridians (aspherical and a cylindrical component) in order to refocus the two focal points back into one single point.
