2011.11.1: Lens Measurer, 1950-1998

Additional Images

2011.11.1: Lens Measurer.
Image No. 3087 ; Photographer: Helen Kingsley

Object Description

Lens measurer comprising of a white round enamel dioptric dial face marked 0-10 with + and - scales and '"CONSOL" LENS MEASURE' printed in black lettering. Blued steel finger pointer. Glazed dial face cover. Metal casing. At the top of the casing are three prongs, two fixed on the outside and a spring-loaded movable pin in the center, with a protective cover. Beneath the prongs 'REG. No. 573041' is stamped into the surface.

Object Classification

Accession Number: 2011.11.1
Collection: Ophthalmology
Date: 1950-1998

Object Dimensions

  • Length: 6.5 cm
  • Width: 4.8 cm

Object Parts

  • a) Lens measurer
  • b) Cover

Object Materials

  • blued steel,
  • chrome plate,
  • copper alloy,
  • enamel,
  • glass,
  • metal,
  • steel

Acquisition Detail

  • Owner: Dr. Edwin Stockdale
  • History of Use: A lens measure, also called a spherometer or lens clock, is a mechanical dial indicator that is used to measure dioptric power of a lens. It measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.