measurements of deltai as a function of retinal area illuminated have been obtained at various levels of standard intensity i ( 1 ) , using `` '' white '' '' light and light of three modal wave-lengths ( lambda465 , 525 , 680 ) , for monocular stimulation and for simultaneous excitation of the two eyes ( `` '' binocular '' '' ) , using several methods of varying ( rectangular ) area and retinal location , with control of exposure time .
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