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five trial lenses / stenopaeic slits
TRIAL CASES, FRAMES AND REFRACTOR HEADS
trial lens set
20th c.
metal; plastic
1999.5291
TRIAL CASES, FRAMES AND REFRACTOR HEADS
trial lens set
20th c.
metal; plastic
Set of five trial lens set accessories mounted in white metal frames with short projecting handles. Three Stenopaeic slits of varying width. Two partial occluders with round apertures.
1999.5291