(905) 689-7234
Fax: (905) 689-4285
301 Dundas Street East
Waterdown, ON
L0R 2H0
info@waterdownoptometric.ca


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HRT / GDX - OPTIC NERVE FIBER LAYER TOMOGRAPHY

Most people equate the eye disease called glaucoma with high eye pressure. It is important to understand that glaucoma is not simply a disease of high intra-ocular pressure, but rather, a more complex disease of the optic nerve. Early-stage glaucoma does not elicit symptoms and understandably any condition that lacks symptoms has great potential risk. In glaucoma the vision conductive rim of the optic nerve, called the nerve-fiber layer, is gradually damaged resulting in a lessening of visual information leaving the eye to the brain. We now understand that measurement of eye pressure is only one small part of the data collected for doctors to evaluate the total picture in regard to glaucoma. Up until now, the tests utilized to diagnose glaucoma and establish the need for treatment were based on eye pressure and documented vision loss and a diagnosis was only possible after vision loss had already taken place.

Recent developments in computer imaging technology now allow us to image the sensitive nerve-fiber layer of the optic nerve utilizing a three-dimensional cross-section view. For the first time this revolutionary technology allows us to understand the progression of optic nerve involvement in regard to glaucoma and other eye conditions long before irreversible vision loss takes place. Tomography utilizes real-time information of the living eye for immediate study and analysis. In addition, each captured image is compared utilizing a normal outcomes database of a patient's age.

The tomograph works something like an ultrasound, but rather than sound, the process utilizes reflected light and converts the layered image into an enhanced color image. This technology allows us to more accurately follow disease progression and to better tailor treatment options. It has now become the standard of care for patients with documented glaucoma, suspicion of glaucoma, and/or, a strong family history of glaucoma.



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