Top 20 Key Players companies in Keratometer by Most Patent Citation in the world in 2019 – Discovery

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The Keratometer top 20 is Discovery PatSnap’ annual ranking of the top 20 Most Patent Citation Keratometer Key Players in the world. Discovery has identified the top key players, startups & unicorns, fast-growings, news entrants in 2019, ranking from differnt perspectives, including patent filing intensity, academic research capability, news media heat. The company list is generated from various data types.

A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Everard Home. A keratometer uses the relationship between object size (O), image size (I), the distance between the reflective surface and the object (d), and the radius of the reflective surface (R).

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1	Humphrey Instruments, Inc.	CA, US	Dashboard,Health care	patent citation: 138
2	EyeSys Technologies, Inc.	TX, US	Medicine,Laser,Corneal topography, ...[+1]	patent citation: 104
3	Canon, Inc.	Tokyo, Japan	Computer hardware,Software,Computer vision, ...[+2]	patent citation: 64
4	LENSAR, Inc.	United States	Medical equipment,Laser,Hospitality industry, ...[+2]	patent citation: 53
5	Tomey Co. Ltd.	Aichi, Japan	Medical equipment,Medicine	patent citation: 53
6	Alcon Laboratories, Inc.	Genève, Switzerland	Medical equipment,Health care,Ophthalmic drugs, ...[+2]	patent citation: 39
7	Carl Zeiss Meditec, Inc.	California, United States	Glaucoma,Medicine,Ophthalmology, ...[+2]	patent citation: 36
8	EssilorLuxottica SA	Île-de-France, France	Eyewear,Product design,Health care, ...[+2]	patent citation: 22
9	AIT Industries, Inc.	Illinois, United States	Health care,Eyewear	patent citation: 22
10	Tomy Co., Ltd.	Tokyo, Japan	Video game	patent citation: 20
11	LaserSight Technologies, Inc.	FL, US	Semiconductor,Electronics,Eye surgery, ...[+2]	patent citation: 17
12	Topcon Corp.	Tokyo, Japan	Electronics,Survey instrument,Food shortage, ...[+2]	patent citation: 15
13	Carl Zeiss Microscopy GmbH	Germany	Microscopy,Scanning probe microscopy,Medicine, ...[+1]	patent citation: 15
14	Ovitz Corp.	New York, United States	Vision problem,Medicine,Sight	patent citation: 12
15	Frigitronics, Inc.	Connecticut, United States	Surgical instrument,Medical instruments,Health care, ...[+1]	patent citation: 11
16	Clement Clarke International Ltd.	Essex, United Kingdom	Medical instruments,Medical equipment,Medicine, ...[+2]	patent citation: 11
17	Surgidev Corp.	CA, US		patent citation: 9
18	Sun Contact Lens Co. Ltd.	JP		patent citation: 8
19	Globechek Enterprises LLC	United States	Information technology consulting	patent citation: 5
20	Nikon Corp.	Tokyo, Japan	Microscope,Photography,Motion capture, ...[+2]	patent citation: 4