Ключевые слова: adult, assist, background, blind, blindness, cane, care, careful, city, closeup, danger, difficulty, disability, disabled, eyesight, handicap, handicapped, health, help, impaired, legs, lifestyle, male, man, navigation, ophthalmology, orientation, outdoors, paved, pavement, pedestrian, person, red, shoe, shoes, sidewalk, sight, sightless, space, step, stick, street, vision, visual, walk, walking,