University Health Network - Academy of Medicine Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Optometry
Vision
Vision Tests
Accession Number
1987.1.2 a-c
Description
Optometer (a) with a wooden handle, metal eyepiece, sliding visual test chart mounted on a calibrated wooden rod; accompanied by a pink card (b), printed and calibrated, two pieces that interlock at the temple; a blank form (c) for ordering corrective lenses based on tests and measurements made usiā¦
Optometer (a) with a wooden handle, metal eyepiece, sliding visual test chart mounted on a calibrated wooden rod; accompanied by a pink card (b), printed and calibrated, two pieces that interlock at the temple; a blank form (c) for ordering corrective lenses based on tests and measurements made using (a) and (b).
Number Of Parts
3
Part Names
a - optometer - Size: Length 33.5 cm
b - eye measure - Size: Length 15.0 cm
c - order form - Size: Length 28.0 cm x Width 21.6 cm
Provenance
Acquired from the Academy of Medicine; source: Dr. T. Porter; used by his grandfather, James Mason, in Listowel.
A device for measuring ocular refraction. Instrument for measuring the refractive state of the eye. There are two main types of optometers: subjective and objective. Subjective optometers rely upon the subject's judgment of sharpness or blurredness of a test object while objective ones contain an optical system which determines the vergence of light reflected from the subject's retina.
It was illegal for optometrists to use optometers after 1919, but they were frequently given away by mail order companies with the spectacle order forms.