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CATS™ Tonometer Prism

$185.00 USD

The New Shape of IOP. Your Goldmann, Better Pressure.

CATS™ Tonometer Prism features a unique, patented, dual-curved surface design that improves IOP accuracy by successfully nullifying measurement errors caused by corneal biomechanics, corneal thickness, and tear film, which affect a large percentage of patients.1-4 Establish a new standard in Goldmann IOP accuracy by simply replacing your traditional Goldmann prism with a new CATS Tonometer Prism to instantly realize improved IOP measurement accuracy.2-4

Why is CATS Tonometer Prism essential for your practice? It is widely accepted that for eyes with average corneas, Goldmann tonometry provides reliable IOP measurements. However, we now know that corneal properties such as Central Corneal Thickness (CCT), Corneal Hysteresis (CH), and tear film vary significantly from average in a large percentage of patients. These variations in corneal properties result in a clinically relevant negative impact on Goldmann Tonometer accuracy. The use of CCT-based IOP correction formulas, to determine individual IOP values, is neither valid nor useful, and as such not helpful in improving Goldmann accuracy or glaucoma decision making.5-6

Experience improved IOP measurement accuracy today with CATS Tonometer Prism.2-4

CATS Tonometer Prism is made in the USA.

CATS Tonometer Prism is only available in the USA and can also be purchased from your Authorized Reichert Technologies Distributor. For US government sales, please call 1-888-849-8955 to place your order. 

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The Benefits of CATS Tonometer Prism with Nathan Radcliffe, MD.

Respected glaucoma specialist, Nathan Radcliffe, MD, discusses the new and innovative CATS Tonometer Prism, and how it can improve the care of glaucoma suspects and patients by providing IOP measurements less affected by corneal properties including corneal thickness, corneal hysteresis, and tear film.2-4,7,8 





The New Shape of IOP.

CATS Tonometer Prism features a unique, patented, dual-curved surface design that improves IOP accuracy by successfully nullifying measurement errors caused by corneal biomechanics, corneal thickness, and tear film, which affect a large percentage of patients.1 Traditional Goldmann tonometer prisms "flatten" the cornea, which amplifies intracorneal stress during the measurement process. The curvature-matching design of CATS Tonometer Prism "cups" the cornea, reducing the impact of corneal thickness and corneal biomechanics on IOP measurements.2-4 In addition, CATS Tonometer Prism has a rolled outer edge which minimizes the tear film adhesion that plagues traditional Goldmann prisms.2-4 Simply replace your traditional Goldmann prism with a new CATS Tonometer Prism and instantly realize improved IOP measurement accuracy.


Significantly Improve Your Goldmann IOP Measurements. 

In patients with average corneas, CATS Tonometer Prism will match traditional Goldmann prism IOP results closely because CATS Tonometer Prism was intentionally designed to measure the same as GAT in patients with average biomechanics and central corneal thickness. As patients' corneal properties deviate from average, the CATS prism will measure IOP more accurately.2-4,7,8 The clinician may note substantial differences between CATS Tonometer Prism and traditional Goldmann IOP results for patients with atypical corneal properties. These differences are due to the ability of the CATS Tonometer Prism to "ignore" corneal factors that affect the traditional Goldmann measurement. CATS Tonometer Prism and traditional Goldmann prism produce similar measurements for normal corneas which ensures long standing IOP benchmarks of normal ad high pressures are maintained, allowing clinicians to seamlessly integrate CATS IOP readings in comparison to their historic GAT IOP readings.2-4,7,8


Easily Integrate Into Any Practice.

CATS Tonometer Prism can be easily mounted on any Goldmann or Perkins tonometer. Simply replace your traditional Goldmann prism with the new CATS Tonometer Prism to immediately realize improved IOP measurements using the same technique you are already familiar with.2-4,7,8




Positioning that Self-Centers. 

The flat surface of a traditional Goldmann prism tip permits IOP error resulting from sub-optimal positioning, because it is subjectively placed on the cornea. Due to the curvature-matching surface, CATS Tonometer Prism self-centers on the cornea, providing clearer and sharper mires when positioned on the apex of the cornea. Improper placement of CATS Tonometer Prism on the cornea results in obviously skewed mires which will not intersect for measurement. This immediately prompts the clinician to reposition the tip to obtain perfectly centered mires on the corneal apex, which further contributes to the improved accuracy and repeatability of IOP measurements by  CATS Tonometer Prism. 



CATS Tonometer Prism Centration Video

See how easy the intuitive CATS Tonometer Prism is to use, by seeing the mires up close in this brief and descriptive video. CATS Tonometer Prism is specially designed to eliminate subjective alignment errors.







 

Goldmann Tonometry Tear-Film Error and Partial Correction with a Shaped Applanation Surface.

By McCafferty S, Enikov E, Schwiegerling J, Ashley S.

"The prism was designed to decrease the sensitivity of applanation tonometry to corneal biomechanical variability as well as tear film adhesion error." 

Read the full PDF article here.

The Goldmann Tonometer Error Correcting Prism: Clinical Evaluation.

By McCafferty S, Lim G, Duncan W, Enikov E, Schwiegerling J.

"The clinical study shows a significant reduction in CATS prism sensitivity to recognized corneal biomechanical errors in GAT IOP measurement."

 
Read the full PDF article here.

Goldmann and Error Correcting Tonometry Prisms Compared to Intracameral Pressure.

By McCafferty S, Levine J, Schwiegerling J, Enikov E,

"GAT errors are well known to most clinicians, and current clinical practice does not correct for most corneal biomechanical errors. However, the CATS tonometer demonstrates the capacity to correct for these inaccuracies and can provide a single error-correlated IOP without additional measurement, calculations, or interpretation error."

Read the Full PDF article here.

 


 

1 - McCafferty S, Lim G, Duncan W, et al. Goldmann tonometer prism with an optimized error correcting applanation surface. Transl Vis Sci Technol 2016; 5:4–5.

2 - McCafferty S, Tetrault K, McColgin A, Chue W, Levine J, Muller M. Modified Goldmann prism intraocular pressure measurement accuracy and correlation to corneal biomechanical metrics: multicentre randomised clinical trial. Br J Ophthalmol. 2019 Dec;103(12):1840-1844. doi: 10.1136/bjophthalmol-2018-313470.

3 - McCafferty S, Lim G, Duncan W, et al. Goldmann tonometer error correcting prism: clinical evaluation. Clin Ophthalmol 2017;11:835–40.

4 - McCafferty S, Enikov E, Schwiegerling J, et al. Goldmann tonometry tear-film error and partial correction with a shaped applanation surface. Clin Ophthal 2018;12:71–8.

5 - Pg 18. Robert N. Weinreb, James D. Brandt, David Garway-Heath and Felipe Medeiros,  World Glaucoma Association on Intraocular Pressure; Consensus Series 4; May 5, 2007

6 - Brant JD, Gordon MO, Gao F, Beiser, JA, Miller JP, Kass MA. Ocular Hypertension Treatment Study Group, Adjusting intraocular pressure for central corneal thickness does not improve prediction models for primary open-angle glaucoma. Ophthalmology. 2012 Mar; 119(3): 437-42. doi: 10.1016/j.ophtha.2011.03.018.

7 - McCafferty S, Levine J, Schwiegerling J, et al. Goldmann applanation tonometry error relative to true intracameral intraocular pressure in vitro and in vivo. BMC Ophthalmol 2017;17

8 - McCafferty S, Levine J, Schwiegerling J, et al. Goldmann and error correcting tonometry prisms compared to intracameral pressure. BMC Ophthalmol 2018;18.

 

CATS™ Tonometer Prism is distributed by Reichert Technologies · CATS is a trademark of CATS Tonometer, LLC · CATS Logo is a registered trademark of CATS Tonometer, LLC

 

CATS Tonometer Prism Specifications: 

  • Catalog Number: 12540 
  • Dimensions: 12.3 mm (W) x 29.9 mm (L)
  • Weight: 1.63 g

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