Abstract
Numerous rigid extended wear lens materials have been introduced in recent years. Selecting the specific lens material for a given patient depends on numerous factors including stability, wettability, and oxygen permeability—not on Dk alone. The lens design is typically larger in diameter, flatter in base curve radius and greater in center thickness than daily wear lenses. The importance of careful verification, notably base curve radius, center thickness, and edge design are paramount. One of the major complications is poor surface wettability, and both the diagnosis and management of nonwetting lens materials are discussed. Material-induced stability problems including flexure and warpage are also emphasized. Corneal problems, including edema, adhesion, abrasion, desiccation, and vascularized limbal keratitis are described. A case format is used to describe representative examples of these complications and reinforce effective management plans.
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