Contact lens induced acute red eye. Sudden onset, corneal infiltrative event observed during EW of hydrogel lenses which is always found associated with sleep. Patient reports generally include waking from sleep with symptoms of irritation or pain, redness and watery … Continue reading
Contact lens induced peripheral ulcer. A circular, well circumscribed, dense, yellowish-white, focal corneal infiltrate (0.2-2.0mm in diameter) located in the peripheral to mid-peripheral cornea. It is always located in the anterior stroma and has a complete loss of overlying epithelium. … Continue reading
The willingness to comply with instructions regarding lens wear schedule, removals and care regimen. Compliance with instructions is essential to maximize success with EW.
Wearing a contact lens constantly, safely and effectively for up to 30 days and nights. Also see Extended wear.
Alteration of the corneal shape due to chronic hypoxia or poor lens fit. Often seen in patients with significant corneal astigmatism fitted with spherical, low permeability rigid lenses and long-term PMMA wearers. Also referred to as corneal warpage syndrome. Observed … Continue reading
Vessel penetration at the limbus into the cornea beyond the translucent zone. The vessels may empty (ghost vessels) but the condition is irreversible and they will refill with the return of stress, usually of hypoxic nature. Localized neovascularization may appear … Continue reading
Also called corneal swelling. Fluid diffuses into the stroma and interrupts the regularity of the stromal fiber structure, causing an increase in thickness (swelling) and loss of transparency. Usually occurs as a consequence to hypoxia or anoxia. Clinical signs include … Continue reading
The normal existence of vascular capillaries at the limbus encroaching no more than 0.2 mm into the cornea from the limbus. Also see Corneal neovascularization.