Non-Contact Tonometry
The non-contact tonometer applanates the cornea by a jet of air, so there is no direct contact between the device and the surface of the eye.
What is NCT tonometry?
A noncontact tonometer (NCT) is a commonly used method in IOP measurement and works following similar principles with GAT without the need for topical anesthetics. NCT is well correlated with GAT. But NCT is affected by central corneal thickness (CCT) more than GAT.
How does non contact tonometry work?
In non-contact tonometry , air pressure is applied to your eye using an instrument that slightly flattens the cornea. The instrument blows a brief puff of air at your cornea, measuring the pressure in your eye. If it shows abnormal results, your doctor will usually perform other tests to confirm your diagnosis.