To know the central corneal thickness is very important to be able to calculate the true Intra Ocular Pressure : the compensated IOP . The TX-20P will automatically calculate the compensated IOP based on the CCT value
The TX-20P has a sophisticated measurement system and provides reliable result extremely fast
ADVANCED INTELLIGENT 3D ALIGNMENT
Just align roughly align on the pupil and the automatic operation system takes over and completes a complete examination
Powered for extremely comfortable operation, All main functions are centralized in the joystick, allowing for the instrument to be operated by one hand.
Central corneal thickness measurement based on cross-sectional image of the slit image of the cornea.
Input patient info by keyboard/barcode reader. LAN and RS-232C interfaces for easy connection to networks.
Placed around the screen with a simple and logical function indication.
FAST BUILT-IN PRINTER
Printer with easy drop-in paper loading and auto cutter. Comprehensive print-out with all relevant data
When there is a measurement error, a snapshot of the examinee’s eye taken just before the measurement is displayed to indicate the possible cause of the error: obstruction by an eyelid or eyelashes.
A safety feature that prevents that the optical head makes physical contact with the patient’s eye.
With USB, RS-232C and LAN connections for easy network integration with existing practice management systems.
Use USB Host Interface to connect a numeric keyboard, Barcode Reader or Magnetic Card reader and input ID directly.
LAN / RS-232C
For easy network integration with existing practice management systems. Additionally , the RK-F2 has extensive connectivity possibilities with several phoropter
XML file output by LAN connection.
Examples output TX-20P
Applanation tonometry is actually a lot less accurate than previously recognized! The measurement results obtained with an applanation tonometer (contact or non contact) are also influenced by corneal properties such as rigidity and thickness. When Goldmann designed applanation tonometry, he assumed that most eyes had a corneal thickness of around 500 micron. Actually there is significant variation in corneal thickness and, as a result, big differences with the IOP value measured with Goldmann tonometry.
Information about the actual corneal thickness is important because without it can mask accurate readings of IOP and delay diagnosis of glaucoma. Unless taken into account, thicker corneas contribute to overestimation of IOP values and thinner corneas to underestimation.
GROWING IMPORTANCE FOR COMPENSATED IOP
All persons that have undergone the popular refractive surgery (LASIK) will have a thinner central corneal thickness and hence whenne measurement with just a tononmeter is done, the result will be an under-estimated.
CENTRAL CORNEAL THICKNESS
The TX-20P will measure the central corneal thickness , based on a cross-sectional quantised image of the slit image of the central cornea.
Based on the central corneal thickness , the true Intra ocular pressure can be calculated : the compensated IOP.
PARAMETER SETTING FOR COMPENSATED IOP
The TX-20P offers a choice 3 different compensation formulas, with adjustable parameters, to automatically calculate the compensated IOP based on the CCT value.
１） corrected IOP = measured IOP – (CCT – 554) * 0.045
Burvenich H, et al. Bull Soc Belge Ophthalmol, 276, 15-18, 2000
２） corrected IOP = measured IOP – (CCT – 550) * 0.05 Shah S et al. Ophthalmology, 106, 2154-2160, 1999
３） corrected IOP = measured IOP – (CCT – 575) * 0.0725
Stodtmeister R, et al. Acta Ophthalmol Scand, 76, 319-324, 1998