PRAZ – state-of-the-art ophthalmic ultrasonic device for  ocular cornea biometrics  (CCT Pachymeter, P-scan).

A new ultrasonic pachymeter  used to measure the thickness of the eye’s cornea (glaucoma screening and refractive surgery).  Corneal pachymetry is an important test in the early detection of glaucoma (Central Corneal Thickness – CCT), and it help also surgeons by providing graphical surgical plans to eliminate corneal astigmatism.

PRAZ user’s interface based on touch screen technology makes operation easy and user-friendly. The touch screen can be also operated not only with fingers, but also using the enclosed stylus to keep it clean.



  • 20 MHz probe operating frequency
  • 400 MHz sampling rate
  • Measuring accuracy:  ≤ 2 μm
  • Resolution: 1 μm
  • Range from 220 µm to 1100 µm
  • Default speed – 1640 m/s (range from 1400 to 2000 m/s)


  • Quick  thickness measurements for all corneal  types
    – the measurement of central corneal thickness (CCT)
    – thickness measurement  at arbitrarily selected points
    – automatic and manual measurements
    – calculation of mean from measurements
    – standard deviation of the measured thickness
    – ability for rejecting uncorrected measurements
  • Very high level of accuracy and repeatability of all measurements:
    – sophisticated algorithms  for accuracy improvement
    – very high frequency for measuring purpose- 400 MHz
    – high averaging ratio – 512 automatic measurements cycles
  • Digital receiver 12 bit
  • Two measurement ranges – Short: 220 ÷ 650 µm, Long: 400 ÷ 1100 µm
  • Automatic TGC adjustment
  • Intra-ocular pressure (IOP) calculations with  measuring  and/or manual correction
  • 7 IOP correction formulas: Kohlhas/Shah, Argus at al, Whitarce et al, Doughty, Ehlers, Dresden, Stodmeister and 3 customs-own
  • BIAS percentage deviation of the measured thickness from 60% to 130%
  • TEST function for automatic checking of operation correctness  (without using external phantoms or patterns)
  • Nine corneal thickness maps with the number of points:
    1, 5, 9, 13, 21, 25, 1 MULTI, 5 MULTI, 9 MULTI
  • Setting the corneal velocity of ultrasounds


  • Ergonomically and lightweight design
  •  Touch Screen
    – easy, ergonomic and user-friendly operation via displayed menu
    – virtual keyboard for entering patient data, etc.
  • Colour LCD  7″ panoramic screen, 800 x 480 pixels
  • Quick start
  • Run/Freeze: Foot Switch or touch screen activated
  • Adjusting the monitor brightness
  • Built-in internal calendar & clock (date and time)
  • Entering a patient and operator data using the touch screen keyboard
  • Internal patient’s database
  • Ten (10) user profiles
  • Support for  barcode reader
  • Integrated internal memory for archive
  • Storing measurement results in internal and  USB-Pendrive memory
  • The possibility of printing the measurement report on the external USB printer
  • Support of multiple languages
  • Easy firmware upgrade via a USB memory


  • Weight: 0,47 kg
  • Dimensions: 195 x 115 x 50 mm


Power supply from external  AC/DC power adapter:
–  input:  100-230V AC 50/60Hz /  max 0.7A
–  output:   +12V  DC / 2 A

Electrical safety standards
Medical device Class IIa complies with MDD 93/42 EEC
– Scanner complies with requirements for Class II devices of EN/IEC 60601-1

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Folder PRAZ

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