Silicone Hydrogel vs Hydrogel: Why Less Water Is Better
Silicone hydrogel lenses hold less water than conventional hydrogels and deliver several times more oxygen. That sounds backwards, and it is the single most useful thing to understand about contact lens materials — because it is also why “high water content” on a box is not the selling point it appears to be. Two different…
Dr. Teresita Bollar, OD