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The Benefits of CATS Tonometer Prism with Nathan Radcliffe, MD - Video
Respected glaucoma specialist, Nathan Radcliffe, MD, of the New York Eye Surgery Center, discusses the new and innovative CATS® Tonometer Prism, its benefits, and ease of use.
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.(1-2)
CATS Tonometer Prism features a unique, patented, dual-curved surface design that effectively reduces measurement errors caused by corneal biomechanics, corneal thickness, and tear film, which affect a large percentage of patients. Easily mount a CATS Tonometer Prism on any Goldmann or Perkins tonometer. Simply replace your traditional Goldmann prism to immediately realize improved IOP measurements using the same technique you are already familiar with.(3-7)
Learn More: http://www.reichert.com/cats
1 - 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
2 - 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.
3 - 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.
4 - McCafferty S, Lim G, Duncan W, et al. Goldmann tonometer error correcting prism: clinical evaluation. Clin Ophthalmol 2017;11:835–40.
5 - 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.
6 - 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
7 - McCafferty S, Levine J, Schwiegerling J, et al. Goldmann and error correcting tonometry prisms compared to intracameral pressure. BMC Ophthalmol 2018;18.
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.(1-2)
CATS Tonometer Prism features a unique, patented, dual-curved surface design that effectively reduces measurement errors caused by corneal biomechanics, corneal thickness, and tear film, which affect a large percentage of patients. Easily mount a CATS Tonometer Prism on any Goldmann or Perkins tonometer. Simply replace your traditional Goldmann prism to immediately realize improved IOP measurements using the same technique you are already familiar with.(3-7)
Learn More: http://www.reichert.com/cats
1 - 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
2 - 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.
3 - 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.
4 - McCafferty S, Lim G, Duncan W, et al. Goldmann tonometer error correcting prism: clinical evaluation. Clin Ophthalmol 2017;11:835–40.
5 - 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.
6 - 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
7 - McCafferty S, Levine J, Schwiegerling J, et al. Goldmann and error correcting tonometry prisms compared to intracameral pressure. BMC Ophthalmol 2018;18.
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