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Axiometer
William Gowlland Ltd
Early 20th c.
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Cone (Prism) Test Lens
Mid 20th c.
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Half-Frosted Disc
Ellis Optical Company
Mid 20th c.
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Priestley Smith Keratometer Trial Lens
Ellis Optical Company
Mid 20th c.
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Stenopaeic slit disc with handle
Mid 20th c.
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