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GDX Glaucoma Test

What is glaucoma?

Over two million Americans have glaucoma making it one of the biggest causes of legal blindness in the United States. Glaucoma can rob people of their vision even though they don’t have any visual symptoms or pain. In fact, half of those with glaucoma don’t even know it. The disease is not easily diagnosed. For example, the standard test, which measures eye pressure, fails to uncover glaucoma in one third of patients with the disease. No wonder glaucoma is called the “sneak thief of sight.”

Don’t let glaucoma sneak up on you.

Now there is a revolutionary new technology that can help doctors find glaucoma earlier, while there’s still time: the Zeiss GDx glaucoma exam, from a trusted leader in innovative diagnostic instruments for eyecare.

GDx Nerve Fiber Analyzer is a scanning laser system that detects early glaucoma by measuring thw thickness of the retinal nerve fiber layer.

Also has a database containing bilateral retinal-verve fiber measurements on hundreds of normal subjects.
The database automatically compares patients' scans with normals matched for age, race and gender, then
generates a color printout of the results.

The GDx is capable of identifying damage in patients in whom we have no other way of detecting it.
We can identify patients before they ever have visual field loss.

The laser acquires data through an undilated pupil in 0.7 seconds. Then the Windows-based software
compares 65,000 measurement points to the normative database, based on the patient's age, race and gender.
Three images of each eye are taken, and the software averages the results. New images can be acquired while the computer processes the information in the background. The patient is aware of a flickering red-light field in
the examined eye, but there is no discomfort.

A better glaucoma detection technology

During our vision examination, we routinely perform the preliminary ZEISS gdx2.jpgGDx™ Screening Test. If this test shows borderline or abnormal results, then we will perform the full GDx™ Exam. Most health insurance companies will allow this extended test for early detection of glaucoma.

This significant diagnostic breakthrough has been found to provide precise, accurate information to help diagnose glaucoma earlier, and possibly start treatment before vision loss occurs.

The ZEISS GDx exam is safe and comfortable and takes 3 minutes or less. The ZEISS GDx scans the retinal nerve fiber layer in the back of the eye using polarized light and measures its thickness at 36,000 points.

These measurements are then mapped by computer and compared to those of healthy, glaucoma-free patients. An abnormally thin nerve fiber layer indicates that glaucoma may be present.

What makes the Zeiss GDx exam so revolutionary?


Unlike the puff test, the Zeiss GDx exam actually lets your doctor see the pattern and thickness of the nerve fibers in the back of your eyes, then

compares the results to normal values. If your nerve fibers are thinner than normal, this could indicate glaucoma long before any vision has

been lost. As a result, your doctor will have more time to treat the disease.

How does the Zeiss GDx exam work?

The test is a quick and comfortable part of a complete eye exam. Plus, you don’t have to have your pupils dilated. You simply look into the Zeiss GDx system while it safely scans the back of your eye. Total exam time usually takes less than a minute, and the system creates easy-to-read images that your doctor can quickly analyze.

Enhanced patient services

Including the ZEISS GDx screening and exam in our practice is another example of our commitment to provide the most advanced and comprehensive eyecare services. If you have any questions about your vision or the health of your eyes, please contact our office. We are more than happy to help with any of your eye care needs.

What makes me at risk?

Do you have:
  • A Family History of Glaucoma?
  • African-American or Latino Ancestry?
  • High Eye Pressure?
  • Immediate Family History of Glaucoma?

If you answered no to all four of the above questions, a complete eye exam is still strongly recommended if:

  • You are 20–29 years old and have never had a complete eye exam
  • You are 30–39 years old and it has been over 5 years since your last complete eye exam
  • You are 40–64 years old and it has been over 2 years since your last complete eye exam
  • You are 65 or older and it has been over a year since your last complete eye exam