What Does “Refractive” Mean?

Even if you know all about myopia (nearsightedness), hyperopia (farsightedness), and astigmatism, you may not know what “refractive” means. These vision problems are called refractive errors, meaning that an irregularity in the shape of the eye or the curvature of the cornea is preventing light entering the eye from focusing on a single point on […]

What Is “Astigmatism”?

The cornea is the curved, clear covering of the colored part of the eye that light passes through.  The term astigmatism usually describes a common problem that results when the cornea is not evenly curved. Normally, the cornea’s surface has a spherical curve (like the shape of a basketball) and the light rays passing through […]