Corvis ST Tonometry and Pachymetry
IOP and corneal thickness measurement
Biomechanical corrected IOP (bIOP)
It is important to correctly assess the intraocular pressure of the eye. Conventional applanation tonometry readings can be affected by the thickness of the cornea: a thicker than average cornea can give artificially high readings and thinner corneas, lower pressure readings. The Corvis® ST mitigates this problem by simultaneously measuring the thickness of the cornea (pachymetry) and calculating the correct pressure. To do this, it records the reaction of the cornea to a defined air pulse using a high-speed Scheimpflug camera. This camera captures over 4300 images per second, permitting highly precise measurement of IOP and corneal thickness. Based on a video of 140 images, taken within 31 ms after onset of the air pulse, the Corvis® ST provides a detailed assessment of corneal biomechanical properties.
The patient places their chin on a chin-rest and fixes their eye on a light or "fixation point" ahead of them. The device releases a short burst of air at the eye and the result is displayed on the operator console.
How Long Does This Take?
A single pressure measurement takes about 5 minutes. AM phasing will take all of the morning and All Day phasing will take from 9:30 until 16:00