Trade In Your Old Unit Working Or Not!
IOP is the only modifiable risk factor for glaucoma and, as such, accurate
tonometry is of critical importance in the diagnosis and management of this
disease. It is widely recognized that the current gold standard for measuring
pressure, the Goldmann Applanation Tonometer (GAT), has considerable
flaws. Goldmann, and other current tonometers, are significantly influenced
by corneal properties such as rigidity and thickness. Though it has been
shown that GAT provides clinically reliable measurements in eyes with
“average” corneas, we now know that many corneas vary more significantly
from average than previously thought.
Numerous Studies have shown that thicker corneas overstate IOP values
and thinner corneas understate IOP. However, thickness does not
adequately describe corneal biomechanical properties, making the use
of CCT-based correction algorithms questionable at best. In fact, researchers
have concluded that correcting IOP based on CCT can lead not only to errors
in the magnitude, but also in the direction of the adjustment