Merits of vision in presence of light scattering using Tiffen ProMist filters

Light scattering caused by Tiffen ProMist photographic filters of various grades at different laser radiation 640 nm, 532 nm and 405 nm was objectively studied and compared. The lack of removal of speckles from the scene of laser radiation scattering did not allow an accurate assessment of the effect of scattering on the decrease in image contrast. Subjective deterioration in visual acuity using various contrast optotypes and contrast sensitivity was assessed by scattering induction using filters up to grade #5. Vision contrast sensitivity diminishes within all studied spatial frequency range 0.5-18 cpd. The degradation of the impact factor to visual acuity without scattering filters when the contrast of the optotype was reduced from 100% to 12.5% for optotypes with black-white letters was up to 30%, which was similar to the level of degradation (25% for a #5 degree filter) from scattering caused by filters modeling cataracts.