Ключевые слова: adult, background, blind, blindness, cane, care, caucasian, cross, crossing, disability, disabled, eye, eyesight, guide, handicapped, health, illness, impaired, legs, lifestyle, male, man, mature, middleaged, moving, navigation, ophthalmology, orientation, outdoors, pedestrian, people, person, road, sight, sightless, street, vision, visual, walk, walking, white,