Hard gas-permeable contact lens. Close-up of an adult inserting a hard gas-permeable contact lens. Contact lenses are worn against the eye separated by a film of fluid. The lens is a thin,shell- like,transparent disc which fits over the cornea. It is used to correct defective vision such as short sight. There are 2 other types of contact lenses: hard & soft. Hard gas-permeable lenses (such as this one) have the same visual qualities as hard lenses,but are more comfortable as oxygen is allowed through the lens to the eye | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Shemilt, Jane |
Bildgröße: | 4691 px × 3015 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |