The use of the Friedmann central field analyser in general optometric practice

The importance of obtaining correct filter settings for the instrument with each patient is investigated in a study of 450 patients, covering the age range encountered in practice. The need for a correct procedure and proper training of any ancillary personnel is emphasized. Ten case histories are presented to illustrate the usefulness and limitations of the instrument. Current views of the relevance of field plotting in glaucoma are discussed. Comparisons between the Friedmann and other instruments are reviewed and a list is given of conditions in which the visual field should be plotted.