Which value denotes the permeability of a contact lens?

The permeability of a contact lens is denoted by DK, which represents the lens' ability to transmit oxygen. This is quantified by the value known as Dk, where "D" stands for diffusion and "k" stands for permeability. A higher Dk value indicates that the lens allows more oxygen to pass through, which is essential for maintaining corneal health and comfort for the wearer. Lenses with appropriate Dk values are crucial for ensuring that sufficient oxygen reaches the cornea, thereby reducing the risk of complications such as hypoxia.

The other terms presented refer to different concepts. PVA typically stands for Polyvinyl Alcohol, which is a material used in the manufacturing of certain products, including some contact lenses but does not directly measure permeability. IOP is an acronym for Intraocular Pressure, a critical factor in eye health but not related to the permeability of contact lenses. LPF stands for Linear Polymeric Film, which again does not pertain to the permeability measurement of contact lenses. Thus, DK is the right value when discussing the oxygen transmissibility of a contact lens.