The new Shape of IOP

We are proud to introduce the CATS® Prism for use with Goldmann type tonometers for the measurement of intraocular pressure (IOP).

We developed the FDA cleared, patented CATS Tonometer Prism™ to instantly deliver accurate IOP measurement. Designed to seamlessly integrate into a clinician’s practice with no additional cost, no new training …while helping you notably streamline patient care.


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On a world-wide basis, the CATS Prism provides the eye care clinician the sight-saving IOP data required to properly diagnose and treat glaucoma and other ocular related diseases for their patients.

About Our technology

Since intraocular eye pressure (IOP) is the second most critical metric next to visual acuity for assessing the ocular health of a patient, our CATS Tonometer Prism™ has the potential to greatly enhance clinical care through accurate IOP measurements. The reusable version of the CATS Tonometer Prism™ has been cleared by the FDA for sale in the United States. Measurement of IOP is not only critical to the accurate diagnosis of ocular disease but also a necessary guide to effective treatment strategies. The CATS Tonometer Prism™ is designed for IOP measurement through an easily adopted modification to the surface of the GAT prism. Additionally, the CATS Tonometer Prism™ is designed to be easily implemented by the worldwide eye care community without altering existing practitioner protocols and with minimal costs related to only changing the GAT’s tip.

Multiple scientific studies demonstrated the performance of the CATS™ prism. The peer-reviewed publications included a direct comparison to the existing GAT prism; human cadaver eye intracameral pressure transducer comparison of the CATS and GAT; an actual intracamerally placed pressure transducer comparison of the CATS and GAT in live human eyes, and tear-film hydrostatic study. All studies confirmed our original mathematical modeling design predictions developed in a National Institute of Health, SBIR Phase I grant. Our presentations on this topic have won “Best Paper of Session” two times at the American Society of Cataract and Refractive Surgery (ASCRS) Conference. Additionally, presentations have also made at Association for Research in Vision and Ophthalmology (ARVO) Annual Conference, American Academy of Ophthalmology (AAO), European Society of Cataract and Refractive Surgery (ESCRS), American Academy of Optometry (AAOpt) and the American Glaucoma Society Annual (AGS) meetings. Our research scientists have published in many scientific journals and presented at scientific conferences as described in the Events tab of our website.

The CATS Tonometer Prism™ is FDA cleared for marketing and sale in the United States and we are in the process of securing the CE Mark.

Our team

Sean McCafferty, MD, FACS

Dr. McCafferty founded CATS Tonometer, LLC and serves as the Chief Executive Officer. He possesses solid expertise in mechanical engineering, optical engineering, and optical engineering, and ophthalmology coupled with demonstrated entrepreneurial skills. This depth of understanding in all three fields is critical to producing products with a wide variety of optical and ophthalmic applications. After completing his undergraduate degree in mechanical engineering, he worked as a product development engineer developing ideas, patents, and profitable products. He then attended the Ohio State University’s Medical School and subsequently completed a residency in ophthalmology at the University of Arizona.

Following residency, Dr. McCafferty became a serial entrepreneur and business manager founding very successful enterprises such as Arizona Eye Consultants, Camp Lowell Surgery Center, Carondelet Foothills Surgery Center, and Intuor Technologies, LLC. Simultaneously, he completed a Master of Science (MS) degree in optical engineering at the University of Arizona expressly to allow his ideas to become reality in the form of products for the ophthalmic industry. During his optical engineering education, Dr. McCafferty’s ophthalmic opto-mechanics research was self-directed under the mentorship of Jim Schwiegerling, Ph.D. He authored several peer-reviewed articles and papers on the subject. In 2017 the University of Arizona Alumni Association selected Dr. McCafferty as the 2017 Alumnus of the Year for the College of Optical Sciences. Click here to see a listing of his publications. Additionally, Dr. McCafferty has produced 10 patents or published patent applications on ophthalmic opto-mechanics.

Nannon Roosa, PMP, CPA, CMPE

Nannon Roosa leads the operational and financial functions for CATS Tonometer. She achieves organizational goals through successful execution of business strategies. Leveraging project management skills, she directs short-term and long-range strategic planning, intellectual property, and budgeting processes. Ms. Roosa guides and participates in growth activities and investor relations to support overall business objectives and plans. Good Clinical Practice (GCP) trained, she also participates in monitoring activities related to scientific studies.

Ms. Roosa is a Project Management Professional (PMP), Certified Public Accountant (CPA), Certified Financial Planner (CFP©), and a Certified Medical Practice Executive (CMPE) designation from the MGMA, or Medical Group Management Association. She earned a B.S. in Business Administration (Major – Accounting) from the University of Tennessee and a Masters in Tax from the University of Texas at San Antonio.

William Lomicka

William Lomicka has more than four decades of healthcare financial management and venture capital experience. Over the years, he has served as a director or senior leader for several U.S. healthcare companies, including health insurance, hospital management, medical device companies, acute care hospitals, nursing and assisted living facilities, and healthcare technology firms. As Senior Vice President of Finance for Humana, Inc., Mr. Lomicka planned, developed, and implemented financial strategies and controls, which generated revenue growth from $145 million to $3 billion. Following Humana, he worked for a healthcare venture capital firm in New York City, where he developed and managed healthcare investments. Mr. Lomicka also served as Secretary of Economic Development for the Commonwealth of Kentucky, later forming a private investment firm in Louisville specializing in venture capital.

Mr. Lomicka currently serves as Chairman of Coulter Ridge Capital and presently serves on the boards of numerous companies, both public and private. He also serves on numerous service boards including the Board of Heuser Hearing Institute in Louisville and Chairs the Board of the Arizona Sonora Desert Museum in Tucson, Arizona.

He earned his MBA from the Wharton School at the University of Pennsylvania after completing his undergraduate degree from Wooster College.

Scott Heck

Mr. Heck has over 25 years of diverse experience in the eye care field serving in several executive positions. His career management responsibilities included sales, marketing, finance, product management, business development and medical device manufacturing. Mr. Heck most recently managed Wilson Ophthalmic Corporation, a distributor of eye care specific pharmaceuticals and medical devices as the Director of Operations, and he currently consults for several medical device companies.


Events & News

CATS Tonometer, LLC routinely shares the results of our scientific studies with the clinician community at conferences and other venues. We also share our knowledge and experiences with a variety of groups in support of science, technology, engineering, and math (STEM) disciplines.

Events News