For a hydrogel soft contact lens, Dk does what as water content increases?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

For a hydrogel soft contact lens, Dk does what as water content increases?

Explanation:
Oxygen permeability in a hydrogel soft contact lens increases as water content rises. Oxygen mainly diffuses through the water-filled portions of the lens, so more water means more pathways and higher solubility of oxygen in the material. This makes the Dk value larger with higher water content. In other words, as water content increases, Dk goes up.

Oxygen permeability in a hydrogel soft contact lens increases as water content rises. Oxygen mainly diffuses through the water-filled portions of the lens, so more water means more pathways and higher solubility of oxygen in the material. This makes the Dk value larger with higher water content. In other words, as water content increases, Dk goes up.

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