CANON TX-20P

FULLY AUTOMATIC NON CONTACT TONOMETER & PACHYMETER

Two in one, tonometer and pachymeter in a single instrument.
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.
With a simple push of the button, an examination will be conducted fully automatically on both eyes – from alignment to printing.
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Description

OVERVIEW

COMPENSATED IOP

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

 

RELIABLE RESULTS

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

 

MULTIFUNCTIONAL JOYSTICK

Powered for extremely comfortable operation, All main functions are centralized in the joystick, allowing for the instrument to be operated by one hand.

PACHYMETER

Central corneal thickness measurement based on cross-sectional image of the slit image of the cornea.

 

EXTENDED CONNECTIVITY

Input patient info by keyboard/barcode reader. LAN and RS-232C interfaces for easy connection to networks.

 

MULTIFUNCTIONAL SWITCHES

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

 

WARNING IMAGES

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.

 

LIMITER FUNCTION

A safety feature that prevents that the optical head makes physical contact with the patient’s eye.

 

EXTENDED CONNECTIVITY

With USB, RS-232C and LAN connections for easy network integration with existing practice management systems.

USB HOST

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

OUTPUT

r models.

XML file output by LAN connection.

Examples output TX-20P

 

PACHYMETRY

 

IMPORTANCE PACHYMETRY

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.

COMPENSATED IOP

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

 

CANON TX-20P BROCHURE

 

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