Ключевые слова: adult, angle, background, blind, blindness, cane, care, careful, caucasian, copy, disability, disabled, escalator, eye, eyesight, full, glasses, handicapped, health, help, illness, impaired, indoors, length, lifestyle, long, low, male, man, navigation, ophthalmology, orientation, person, portrait, professional, safety, sight, sightless, space, special, stick, text, unsighted, view, vision, visual, walk, white, young,