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 papillary conjunctivitis. Signs may range from mild hyperemia of the upper tarsal conjunctiva with a few, small papillae to severe hyperemia with large, raised papillae, which have a cobblestone appearance. CLPC may present as a localized or … 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.
Fluorescein, lissamine green or rose bengal staining of the bulbar conjunctiva. A normal finding at low grades in most contact lens wearers, but may also be observed as a result of dry-eye conditions and/or due to microtrauma from the lens … Continue reading
See CLARE
Wearing a contact lens constantly, safely and effectively for up to 30 days and nights. Also see Extended wear.
Often referred to as the clear front part of the eye, this tissue serves to bend light and helps focus light rays onto the retina. The cornea accounts for approximately 60% of the refractive power of the eye (the lens … Continue reading
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
See Corneal oedema.
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
Occurs when fluorescein penetrates damaged cell membranes or when it fills gaps in the epithelial cell surface. Gaps are created when cells are damaged or displaced. There are a large number of reasons for corneal staining caused by lens wear … Continue reading
See Corneal oedema
The contour of the cornea can be visualized using corneal topography. This is accomplished in a few ways. One method is to determine the radius of curvature for all regions on the surface of the cornea. Another method projects an … 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.
see Corneal distortion.
see Continuous wear.
