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lenses from vision-testing trial case

https://mhc.andornot.com/en/permalink/artifact9465
Dates
1930
1940
circa 1930-1940
Collection
Dr. Charles H. Bird / Dr. Godfrey Bird Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Ophthalmology
Optometry
Vision
Vision Tests
Accession Number
997037506 a-c
Description
(a) Glass lens in metal wire frame; (b) glass lens with convex surface; (c) glass lens with convex surface, thicker than (b); Note: item is missing.
  1 image  
Accession Number
997037506 a-c
Collection
Dr. Charles H. Bird / Dr. Godfrey Bird Collection
Category
Diagnostic & Treatment Artifacts
Vision
Classification
Ophthalmology
Optometry
Vision
Vision Tests
MeSH Heading
Vision Tests -- instrumentation
Optometry
Vision
Vision Tests
Description
(a) Glass lens in metal wire frame; (b) glass lens with convex surface; (c) glass lens with convex surface, thicker than (b); Note: item is missing.
Number Of Parts
3
Part Names
a - metal-rimmed lens - Size: Length 5.0 cm x Width 3.6 cm x Depth 0.3 cm
b - lens - Size: Depth 0.4 cm x Diam. 3.3 cm
c - lens - Size: Depth 0.7 cm x Diam. 3.3 cm
Provenance
Owned and used by Dr. H. G. Bird of Gananoque, Ontario
Dates
1930
1940
circa 1930-1940
Material
glass: clear
metal: yellow; grey
Permanent Location
Storage Room 0010
0010-E4-8
Temporary Location
Item is missing.
Condition Remarks
(a) few scratches on lens; minor wear on wire rim; (b,c) few scratches on lens
Copy Type
Original
Research Facts
Spare lenses for ophthalmology testing kit
Images
Less detail