OCULUS Corvis® STL

The revolutionary OCULUS Corvis^® STL records the reaction of the cornea to a defined air pulse with a newly developed high-speed Scheimpflug-camera that takes over 4,300 images per second. IOP and corneal thickness can be measured with great precision on the basis of the Scheimpflug images.

Corneal Visualization
Scheimpflug Technology

The revolutionary OCULUS Corvis® STL records the reaction of the cornea to a defined air pulse with a newly developed high-speed Scheimpflug-camera that takes over 4,300 images per second. IOP and corneal thickness can be measured with great precision on the basis of the Scheimpflug images.

Measurement and Display Options

IOP measurement
Measurement of the corneal thickness
Scheimpflug images of the 1st and 2nd applanation of the cornea
Slow-motion video of the corneal deformation as a result of the air pulse
Non-contact tonometer in combination with an ultra-high-speed camera for visualization of the deformation of the cornea in reaction to an air pulse (4,330 frames / sec.)

Corvis STL - iop-and-corneal-thickness-measurements

The new measuring technique uses an ultra-high-speed Scheimpflug camera in combination with an air pulse to determine IOP values with great precision. Initial studies have confirmed the high degree of reproducibility in comparison to that obtained by Goldmann applanation tonometry and non-contact tonometry¹⁾.

The measurement principle employed here ensures results uninfluenced by such factors as insufficient tear film or patient positioning. Automatic release and specified measurement quality guarantee user-independent data. Up to 6 measurements can be taken, and the average IOP is printed out or displayed. IOP measurements can be corrected with the aid of pachymetry-based correction tables including the Dresden correction table and the new Spoerl correction table, which takes patient age into account.

An integrated Scheimpflug camera enables the OCULUS Corvis^® STL to take precise measurements of corneal thickness. Integrated correction tables (Dresden, Ehlers …) also allow for correction of IOP measurements according to central corneal thickness. The OCULUS Corvis^® STL determines corneal thickness along the entire horizontal sectional plane as well as apical and minimal corneal thickness.

Technical Data

Tonometer
Measurement range	6-60 mmHg
Measurement distance	11 mm (0.4 in)
Inner Fixation Light	Red LED

Scheimpflug camera
Frame rate	4,330 images per sec
Measurement range	8.5 mm (0.3 in) horizontal coverage
Pachymeter measurement range	200-1,200 μm
Measuring points	576 per image (80,640 per examination)
Source of light	Blue LED (470 nm UV free)