Time to Change How We Measure Eye Pressure

There is new language when discussing glaucoma- Corneal Hysteresis. So, what is it, and how does it affect me?

Corneal Hysteresis (CH) is measured by an Ocular Response Analyzer, and measures the shock absorption of the eye.  You want a CH above 10.  A higher number indicates you are less likely to develop glaucoma progression as the eye can protect the optic nerve.

For quite some time, doctors have relied on the Goldmann Applanation Tonometry (GAT).  Many patients are familiar with this “blue light test” as the optometrist uses yellow, sticky, numbing drops.  As with all of medicine, technology advances may be replacing this test in favor of CH, corneal compensated IOP (IOPcc) and the Ocular Response Analyzer.

Whatever tests eye care professionals deem as the best to use to help them screen for and manage glaucoma, one thing is for certain: in order for them to do that test, they first have to get patients in to see them. It is imperative for patients not to skip their annual eye exam.

According to the CDC, “about 3 million Americans have glaucoma. It is the second leading cause of blindness worldwide. Open-angle glaucoma, the most common form, results in increased eye pressure. There are often no early symptoms, which is why 50% of people with glaucoma don’t know they have the disease.” Early detection and treatment is crucial if one wants to fight to keep one’s precious sight.

Glaucoma and marijuana.  While there is evidence that marijuana can lower the pressure in the eye, it must be noted that the condition is very temporary and is not effective in treating glaucoma.


Southshore Optometric
202 Broadway
Amityville, NY 11701

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