VISUAL ACUITY AND ILLUMINATION IN DIFFERENT SPECTRAL REGIONS

摘要: The relation between visual acuity and illumination was measured in red blue light, using a broken circle or C grating as test objects. light data fall on single continuous curves representing pure cone vision. two distinct with transition at about 0.03 photons. Values below this intensity represent rod Those immediately above the cooperative activity of rods cones, yield higher acuities than either. Pure vision region is given by central fixation (C object). All rest values In lie 1.5 log units lower axis (cone scale) they do white while 1.0 unit light. Both object are precisely described one form stationary state equation. With non-limiting pupil, another same equation which curve half steep. introduction small limits maximum acuity, makes appear steeper. Determinations under variety conditions show that for pupil has to be larger, longer wavelength order not limiting factor. Similar measurements when discrimination retina experimentally made factor resolution, improved designed increase image contrast. However, cannot ordinary resolution because improve contrast those reduce produce proportional reductions acuity.