4. Corneal Edema (swelling)is due to contacts preventing air from getting to your cornea that lies underneath the lens.

• Improperly used extended wear lenses are most likely cause.


• Often, there are no symptoms. Other times, wearer may experience hazy vision, haloes around lights and pain upon removal of the lenses.


• Allowing the condition to continue can cause breaks on the corneal surface and lead to corneal infection and permanent scarring of the cornea.


• Best treatment – remove your lenses ASAP if you notice these symptoms.


• Regular follow-up examinations can detect oxygen deprivation and microscopic cornea changes before they become problematic.