Optical Tonometer
name: label: maker
content: E. B. Meyrowitz, Inc.
notes: label: Description
content: An optical tonometer determines intraocular pressure by measuring the resistance of a cornea to indentation. A German professor introduced the basic form in 1862. William McLean (1876-1966), a homeopathic surgeon affiliated with the New York Ophthalmic Hospital, argued that his patented design offered several improvements over the Schiotz: it was more easily read, and there was no need to change weights. Inscriptions on the box of this example read “McLean Tonometer” and “E. B. Meyrowitz, INC. / LONDON-NEW YORK-PARIS”.
label: Description
content: Ref: William McLean, “Method of and Means for Measuring the Hardness or Softness of Eyes,” U.S. Patent 1,291,050 (Jan. 14, 1919).
label: Description
content: William McLean, “Some Experimental Investigations Concerning Intra-Ocular Pressure,” <i>Journal of Ophthalmology, Otology and Laryngology</i> (1914).
label: Description
content: V. Mueller & Co., <i>Surgeon’s Instruments, Office and Hospital Equipment</i> (1916), p. 3.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Medicine
creditLine: label: Credit Line
content: R. N. Taylor, M.D.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1977.1223.026
label: catalog number
content: 1977.1223.026
label: accession number
content: 1977.1223
objectType: label: Object Name
content: Tonometer
label: Other Terms
content: Tonometer; Medicine
physicalDescription: label: Measurements
content: case: 1 1/8 in x 6 in x 3 3/4 in; 2.8575 cm x 15.24 cm x 9.525 cm
label: Measurements
content: tonometer: 5 1/4 in x 2 3/4 in x 1/2 in; 13.335 cm x 6.985 cm x 1.27 cm