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