Another name of corneal swelling is “edema”, which happens when inadequate supply of oxygen reaches to the cornea, due the wearing of contact lens. Most of the contact lens users sleep while wearing contact lenses in their eyes. They probably suffer from corneal swelling. Risk of corneal swelling can also be increased if one continues the over-wearing of contact lenses in the eyes. With extended wearing, oxygen cannot reach properly, and normal blinking of the eye is also not present there, which help tears and oxygen to circulate in the eye over contact lens. Foggy vision, irritation, pain and redness are symptoms of corneal swelling.

Sometimes it happens that you wear contact lenses in both of your eyes, but corneal swelling suffers only in one eye. Years of research and experiments have proved that corneal swelling happens in those user’s eyes who wear contact lenses regularly, improperly and whole day/night. Sometimes it happens that you wear a contact lens only in one eye, but the corneal swelling occurs in the second eye.

Two types of soft contact lenses are used by the users in their eyes, whole day and night. One of these is a highly oxygen permeable silicone hydrogel and the second one is basically a conventional hydrogel with relatively low oxygen permeability. The corneal swelling occurs in one eye by using both types of contact lenses. Another discovery emerged is that, no matter which contact lens is being worn in the eye, the other eye always remains empty to serve as a control.