For the sake of perspective, brief consideration will be given to methods of measuring light and color sensitivity. Three methods have been used: (1) the light and color minima and light and color differences ; (2) the limits of sensitivity (the perimetric method) and (3) the light minimum for the discrimination of detail.
METHODS OF MEASURING LIGHT AND COLOR SENSITIVITY
The Light and Color Minima and Light and Color Differences.
—These methods are customarily used to measure light and color sensitivity in central vision. They have not been used for practical work in peripheral vision because of the lack of a suitable and feasible means of presenting at all points in the field of vision a stimulus the intensity of which can be varied. The results obtained may be expressed in various ways. With the use of spectrum light in scientific work we have been accustomed to make the specification
FERREE E, RAND G. ATTACHMENT TO THE FERREE-RAND PERIMETER FOR DETERMINING LIGHT AND COLOR MINIMA. Arch Ophthalmol. 1939;22(4):636–652. doi:10.1001/archopht.1939.00860100120010
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