A. GENERAL CONSIDERATIONS
TO CREATE a perimeter in which precise visual fields may be obtained, all extraneous apparatus should be excluded from the patient. Only the point of fixation and the isopter should be within the range of vision. These points of fixation should be easily checked by the examiner while taking the field of vision, without his disturbing the patient.In order to detect the early pathological changes induced by glaucoma, retinal disease, and abnormal factors affecting the intracranial portion of the visual pathway, even lighting upon the test object or target is necessary. Illumination of the perimeter must be equal in all meridians and should be controlled by the examiner so that any desired volume, in foot-candles, can be attained. The moving of the test object or target should be silent and have no distracting mechanisms. The examiner should be able to change the meridional position of the
RAIFORD MB. PERIMETER WITH CONTROLLED ILLUMINATION AND RECORDING MECHANISM. AMA Arch Ophthalmol. 1954;52(4):550–556. doi:10.1001/archopht.1954.00920050552006
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