Cost Of Gas Permeable Contact Lenses

contact lenses
A thin plastic lens placed directly on the surface of the eye to correct visual defects
(contact lens) A thin lens, made of flexible or rigid plastic, that is placed directly on to the eye to correct vision, used as an alternative to spectacles, or, if coloured, to change one's eye color cosmetically
(contact lens) contact: a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
(Contact lens) A small plastic disc containing an optical correction that is worn directly on the cornea as a substitute for eyeglasses.

gas permeable
(Gas Permeability) the ability of a gas or other volatile substance to penetrate a material. Materials that will allow significant passage of gases are said to be permeable, while materials that resist or stop the passage of gases are said to offer gas barrier properties.
(of a contact lens) Allowing the diffusion of gases into and out of the cornea
(Gas permeability) is the permeability of an insulating layer for gaseous substances. The gas flow requires a difference of pressure and is characterized by the permeability coefficient (DIN 53380, DIN 535536, ISO 1399).
(Gas Permeability) Amount of air that can go through a lens.

cost
Involve (someone) in (an effort or unpleasant action)
monetary value: the property of having material worth (often indicated by the amount of money something would bring if sold); "the fluctuating monetary value of gold and silver"; "he puts a high price on his services"; "he couldn't calculate the cost of the collection"
(of an object or an action) Require the payment of (a specified sum of money) before it can be acquired or done
be priced at; "These shoes cost $100"
Cause the loss of
the total spent for goods or services including money and time and labor