Soft contact lens for the correction of astigmatism

摘要

The invention is incorporated to a soft contact lens. This lens has a concave posterior surface for fitting to the eye of a wearer, and a convex anterior surface for exposure from the eye of a wearer. The soft contact lens contains a correction for the eye having a component of astigmatism. A novel posterior surface has a central refractive segment sufficient in dimension to afford pupil coverage and therefore correction to the vision of the eye of the wearer. This central portion is configured for imparting a component of astigmatic correction of the eye of a wearer in a first central zone containing the refractive segment. When the contact lens is worn, this first central zone is juxtaposed to the central portion of the eye of the wearer. The posterior surface at the first central zone is surrounded by a posterior zone for fititng the soft contact lens to the eye of the wearer. This posterior zone about said first central zone has as its main purpose the maintenance of the contact lens to the eye of the wearer. Since by exclusion, it does not have substantial pupil coverage, it is tailored to the keratometry of the eye and enables the lens to be maintained on the eye. By combining the posterior central zone with the anterior portion of the lens, an arbitrary amount of refractive correction of error to the eye of the wearer can be accommodated.