Glaucoma Evaluation
What the GDx Examination Shows
The exam from the GDx prints a color coded "thickness map" of the nerve fibre layer at the back of the eye. The deviation map identifies areas where retinal nerve fibre layer thickness is outside normal limits This information can assist the ophthalmologist to obtain objective values on the early changes which may help to determine if you have glaucoma. It also helps to follow and monitor progression in changes of patients who have already been diagnosed with glaucoma.
In summary, the GDX can:
- Quantify damage over time in patients with glaucoma.
- Identify early damage in patients at risk for glaucoma i.e. ocular hypertension
- Differentiate normal optic nerve changes from glaucomatous damage
- Detect progression (or stability) of glaucoma.
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How the GDx examination is used
The GDx can be used to track the progression of glaucoma and can help determine if you have glaucoma, or other eye diseases. The GDx can be used at periodic times during the year to see if there are any changes which have not been seen on the visual field or through the dilated examination when evaluating the optic nerve head.
Patients who are at risk for glaucoma should have a GDx done as a baseline in conjunction with a thorough eye examination by one of our ophthalmologists. Patients who are at risk include:
- Anyone over the age of 40
- Afro-Caribbeans over 35
- Individuals with a family history of glaucoma
- Diabetics and cardiovascular patients
- Individuals with raised eye pressure but no apparent visual field defect.
- Individuals with hypertension
- Long-term users of steroids
- People who are myopic or short-sighted
- Anyone who has suffered a traumatic eye injury
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