Are You Looking to Get Fitted With Silicone Hydrogel Contact Lenses?
All types of contact lenses reduce the amount of oxygen that gets through to the cornea. If this decrease is excessive it can lead to redness, swelling of the cornea, blurred vision and eye pain. This was especially a problem in the past when people slept in contacts that let relatively little and insufficient oxygen through to the eye. Even worse, this can be associated with sight threatening infections of the cornea.
Increasing the oxygen permeability has advantages for all contact lens wearers but is especially beneficial when wearing them extended wear. Silicone hydrogel contact lenses were produced to reduce problems associated with insufficient oxygen getting to the cornea.
Sleeping in contacts should only be done under the close supervision of an eye doctor and only as instructed.