McHardy type perimeter, London, England, 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.
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The branch of medicine dealing with the diseases and surgery of the visual pathways (usually the eyes or the brain).