PASCAL
PASCAL Dynamic Contour Tonometer DCT True IOP from Ziemer.
PASCAL is a slitlamp mounted tonometer for measuring intraocular pressure IOP independent of corneal properties.
  • TRUE IOP - independent of CCT and rigidity
    confirmed with intracameral measurements
  • Highest repeatability
    for a refined IOP & glaucoma progression analysis
  • Ocular Pulse Amplitude OPA
    a measure for the short term pressure fluctuations
  • Elimination of late or missed diagnosis
    as seen with false negatives from GAT measurement
Every millimeter of IOP reduction lowers the risk of glaucoma progression by 10%. But current tonometers are not precise enough to measure with such accuracy and tonometry correction nomograms for CCT do not work.

In-vivo calculation studies have shown that PASCAL measures closest to true IOP and is independent of corneal properties like CCT or rigidity. PASCAL therefore is the solution to the problem that correction nomograms based only on CCT are neither valid nor useful in an individual patient.

Proven to be the most accurate and reproducible tonometer today, PASCAL helps you to detect more true glaucoma suspects and manage IOP more precisely.


Pascal isn't an applanation tonometer. Opposite to a Goldman tonometer, the head of Pascal is not flat but concave, for a better and more comfortable fit onto the cornea.
Because it doesn't flatten the cornea the measurement is not affected by the biomechanical features of the cornea such as astigmatism or edema.
The Pascal is almost unaffected by any kind of surgery or therapy:
LASIK more
Crosslinking more
Keratoconus more
Trabeculectomy more
Latanoprost more
Penetrating Keratoplasty more
The Ocular Pulse Amplitude (OPA) is the difference between the systolic and the intraocular pressure. Studies have shown that patients with OPA below average are more likely to develop glaucoma.
Pascal measures the diastolic and systolic intraocular pressure dynamically. Data are transfer through wireless to the PC, where the curve of intraocular pressure is being calculated and stored.
Pascal has a single button and has the ease as common tonometers for its use. It is easily fitted to each slit lamp. It automatically self regulates itself before each measurement, therefore it needs no calibration.
PASCAL Findings from clinical studies Links:  

History on Tonometers and Tonometry
World consensus on IOP measurement
IOVIS Intracameral Tonometer confirmation