Flexure Of The Boston 7 RGP Lens; A Low Silicone Content Lens.

It has been well documented in several research studies that PMMA and rigid gas
permeable (RGP) contact lenses flex on toric corneas. Many variables can affect this flexure such as base curve, center thickness, and optic zone diameter of the contact lens. Also, the material of the lens can affect flexure. Lenses with high silicone content tend to exhibit a high amount of flexure. The new Boston 7 lens has a low silicone content and this should exhibit a low amount of flexure. This study was designed to measure the amount of flexure present on toric corneas that were fit on-K, Flatter-Than-K (FTK), and Steeper-Than-K (STK) with the Boston 7 RGP lens.