McHardy type perimeter, London, England, 1885-1930

1885-1930 in London
Curry & Paxton

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Perimeter, McHardy's type with spare candles and chart, by Curry and Paxton, London, 1885-1930. Full view, graduated
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Perimeter, McHardy's type by Curry and Paxton, London, 1885-1930

Perimeters were introduced in the 1850s to locate the visual field defects. These are sometimes referred to as ‘blind spots’. This type was designed in 1882 by leading ophthalmic surgeon Malcolm MacDonald McHardy (1852-1913). It was made by Curry and Paxton of London.

The patient punched a circular chart when the target, a square of coloured paper, moved out of view. The mechanism mapped their field of view.


Object Number:
A606421 Pt1
metal, plastic and string

Cite this page


We encourage the use and reuse of our collection data.

Data in the title, made, maker and details fields are released under Creative Commons Zero

Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data


Download catalogue entry as json

View manifest in IIIF viewer

Add to Animal Crossing Art Generator

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.