The Use of the Planimeter to Measure Fields of Binocular Fixation

Shayne Brown, DipAppSc(Cumb), DOBA
Alison Pitt, DBO(T), DOBA
Geraldine McConaghy, DipAppSc(Linc), DOBA

The fields of binocular fixation of 20 normal subjects were plotted on an arc perimeter and the area of the fields was then measured with a planimeter. A planimeter is a cartographic device used to measure areas of two dimensional closed, irregular areas. The results showed that the planimeter gave an accurate quantifiable measure of fields of binocular fixation in normal subjects.