Catalogue Number: 1984
Spectacles for measuring interpupillary distance and eye height from datum
Sub-Category: PD ruler, pupillometer
Year Of Publication/Manufacture: Early 20thC
Time Period: 1900 to 1939
Description Of Item: Steel round eye spectacles with saddle bridge, no nose pads, curl sides and glazed with plano flat lenses both engraved with a datum line (marked 2) and marks for measuring centre of pupil height above or below datum and for measuring interpupillary distance from 56 mm to 62 mm.
Location: Archive office. East wall shelves unit 3. Drawer 5