Ophthalmoscope

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Ingenium, 2008.1607.001
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OBJECT TYPE
Ophthalmology/Loring/miniature
DATE
1920–1940
ARTIFACT NUMBER
2008.1607.001
MANUFACTURER
Down Bros.
MODEL
Unknown
LOCATION
London, England

More Information


General Information

Serial #
N/A
Part Number
1
Total Parts
3
AKA
N/A
Patents
N/A
General Description
Instrument is all metal, with exception of clear glass lenses; folding handle has silver metal finish; metal disks housing silvered mirror and rotating lenses have darkened finish.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
9.4 cm
Width
3.1 cm
Height
N/A
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Medical Technology
Category
Instruments
Sub-Category
N/A

Manufacturer

AKA
DOWN
Country
England
State/Province
Unknown
City
London

Context

Country
Unknown
State/Province
Unknown
Period
Unknown
Canada
Part of a collection of medical instruments used by J.R Jackson and W.A.L. Jackson, father and grandfather of donor. [Ref. 1]
Function
Unknown
Technical
One of the early problems when using the direct ophthalmoscope with the light placed to the side was the need to tilt the mirror at an angle to the line of observation for the light to enter the patient's eye. This meant that the observer was viewing the fundus obliquely through the correcting lenses. For low lens powers this was not a problem but in the higher ranges it produced a reduction in vision and a shifting of the image due to the prismatic effect. In 1875 John Couper of the Royal London Ophthalmic Hospital overcame this problem by dissociating the round disc of lenses from the mirror. By this means the observer was able to look through the centre of the lenses perpendicularly. Couper's design, made by Pickard and Curry of London, went through several models and effectively made redundant the fixed-mirror design. Edward Loring of the USA improved on Couper's model in 1877 with his vertically tilting mirror. This consisted of a round mirror with the sides cut off, rotatable on its vertical axis. [Ref. 2]
Area Notes
Unknown

Details

Markings
Rotating lenses are labelled. "LONDON/ DOWN" stamped into back of mirror housing.
Missing
Appears complete.
Finish
Instrument is all metal, with exception of clear glass lenses; folding handle has silver metal finish; metal disks housing silvered mirror and rotating lenses have darkened finish.
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Down Bros., Ophthalmoscope, circa 1920–1940, Artifact no. 2008.1607, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2008.1607.001/

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