Glaucoma is a leading cause of blindness, but early detection is critical for effective treatment. David Shanahan uses laser imaging equipment for assessing the health of the eye.
Primary or chronic open angle glaucoma is the most common kind, with two thirds of cases presenting with this type. It occurs when the ‘drainage angle’ (the area where the fluid leaves the eye) appears to be open, but does not function properly and pressure within the eye increases.
Occasionally the drainage angle of the eye may become narrow and close gradually, this is called chronic angle closure. If the drainage angle closes suddenly it is called acute angle closure.
Acute angle closure glaucoma causes severe sudden pressure rise and is typically painful with the development of redness. Vision may become blurred, and halos may be seen around bright lights. Other symptoms can include headaches, nausea and vomiting. Chronic angle closure leads to gradual pressure, however, does not respond well to standard medicine such as eye drops.
Raised eye pressure cannot be felt unless it quickly becomes noticeably elevated, as in acute angle closure glaucoma, most patients are therefore unaware they have glaucoma.
Regular eye examinations are the best way to detect glaucoma. An examination will measure the fluid pressure, examine the drainage angle, test the visual fields, and examine the optic nerve.