What term refers to the amount of oxygen that passes through a lens material of specific thickness?

The term that refers to the amount of oxygen that passes through a lens material of a specific thickness is DK/t. This measurement is crucial in contact lens design because it directly influences the health of the cornea. DK represents the oxygen permeability of the lens material, while 't' denotes the thickness of the lens. Thus, DK/t indicates the effective oxygen transmission capability of the lens when considering its thickness. Adequate oxygen transmission is vital for maintaining corneal health and preventing complications such as hypoxia, which can arise when the cornea does not receive enough oxygen.

In contrast, flare relates to light scattering and visual acuity impacts and does not pertain to oxygen transmission. Eccentricity is a term often used in optics to describe the shape of a lens or curvature but is not directly linked to oxygen permeability. Permeability, while related to oxygen transmission, does not specifically account for the thickness of the lens, which is why DK/t is the most relevant term in this context.