Renseignements généraux

Nº de série

888

Nº de partie

1

Nombre total de parties

1

Ou

keratometer

Brevets

S/O

Description générale

Predominantly black metal instrument [includes brass and cast metals]; red rubber [?] fittings atop illuminated boxes mounted on disk; off-white fabric covering on electrical cord; brass telescope fitted with clear glass optics; white synthetic panels fitted in front of light boxes; glass bulbs; off-white markings on adjustment scales; bakelite [?] power switch and housing

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

54,0 cm

Largeur

40,0 cm

Hauteur

59,2 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Technologie médicale

Catégorie

Matériel médical

Sous-catégorie

S/O

Fabricant

Ou

Meyrowitz

Pays

United States of America

État/province

New York

Ville

New York

Contexte

Pays

Inconnu

État/province

Inconnu

Période

Presumably used c. 1900 +

Canada

Part of a large collection of medical artifacts, archival material & trade literature transferred to CSTM in 2002 from the former History of Medicine Museum, Toronto, ON.

Fonction

Used to measure the curvature of the anterior surface of the cornea.

Technique

The ophthalmometer was invented c. 1855 by Helmholtz [who had invented the ophthalmoscope 4 years earlier]. Although it was accurate, the need for 15-20 readings per patient plus calculations prevented its adoption until the late 1880s, when it was simplified. In 1894 the American Medical Association [AMA] advocated that the ophthalmometer, ophthalmoscope, etc. be used for objective eye examinations. (Reiser, p. 49) Ophthalmometers measure the radius of the curvature of the anterior (front) surface of the eye. They facilitate the measurement of the diameter of the cornea, allowing the user to judge the volume of the eyeball. They were used when prescribing and fitting spectacles, as the lens vertex and corneal vertex must be considered. In modern times, they have been used mainly for fitting contact lenses. The Javal and Schiotz design (1881) of the instrument was one of the first successful and widely adopted models.

Notes sur la région

Inconnu

Détails

Marques

"JAVAL-SCHIOTZ/ OPHTHALMOMETER/ [logo]/ 888/ PATENTED APR. 24, 1900./ E.B. Meyrowitz/ NEW YORK PARIS" cast in raised print on plate at base of telescope mounting. Scales 0-165 [double]divided at intervals of 5 and labelled in increments of 15, and 5-45 over 5-13 divided in single increments. UHN catalogue no. "986.18.4" printed by hand in white ink on instrument. [NB: arc on which illuminated boxes can be positioned is divided: markings are present but worn/illegible at time of cataloguing.]

Manque

Unknown- appears complete. Chin and forehead rest may originally have been leather-covered.

Fini

Predominantly black metal instrument [includes brass and cast metals]; red rubber [?] fittings atop illuminated boxes mounted on disk; off-white fabric covering on electrical cord; brass telescope fitted with clear glass optics; white synthetic panels fitted in front of light boxes; glass bulbs; off-white markings on adjustment scales; bakelite [?] power switch and housing

Décoration

S/O