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BLOG: What's that red line for, anyway?

May 27, 2015

Today in optometry, much emphasis is put on correctly measuring a patient’s IOP to the exact mm Hg. With attention being placed on corneal pachymetry and hysteresis, there is another simple – yet important – step you can do to ensure proper IOP reading. It has to do with that red line on your Goldmann tonometer.

When Dr. Goldmann developed his tonometer, he calibrated it to produce a specific area of flattened cornea: 7.354 mm2. This is derived from the equation to find the area of a circle: area = 3.14 x radius2. In our situation, the radius of the Goldmann probe is 1.53 mm. When measuring spherical corneas, measurements can be made on any meridian. We use 0 and 180 for convenience.

In the Journals

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Meeting News Coverage Video
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Blog

BLOG: What's that red line for, anyway?

May 27, 2015
Today in optometry, much emphasis is put on correctly measuring a patient’s IOP to the exact mm Hg. With attention being placed on corneal…
In the Journals

Amino acid peptide improves signs, symptoms in severe dry eye

May 22, 2015
Patients with chronic graft-vs.-host disease who were treated with thymosin β4 eye drops (RGN-259, 0.1%) experienced statistically significant…
VIDEO: Surgeon uses nomogram to correct astigmatism during cataract surgery Meeting News CoverageVideo

VIDEO: Surgeon uses nomogram to correct astigmatism during cataract surgery

May 21, 2015
MILAN, Italy — At the OSN Italy meeting, Rolando Toyos, MD, talks about his presentations on a newly developed nomogram for the correction of…
VIDEO: Surgeon discusses severe cases of keratoconjuncivitis Meeting News CoverageVideo

VIDEO: Surgeon discusses severe cases of keratoconjuncivitis

May 19, 2015
PARIS — At the meeting of the French Society of Ophthalmology, Sihem Lazreg, MD, briefly summarizes the content of her contribution to the annual…
Breaking News

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Epidemiological data on keratoconus highlight roles of ethnicity, environmental factors Meeting News Coverage

Epidemiological data on keratoconus highlight roles of ethnicity, environmental factors

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From The Editor

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