How can people who are blind or visually impaired perceive visual images?
Different visual impairments lead to different levels of sight, and but even people who are congenitally blind can perceive visual images. Given proper training blind people can understand and recreate in two-dimensional drawings using either a pen or raised line drawing boards. They can create two-dimensional renderings of shapes they have felt in three dimensions, and can create a mental image of an object they have experienced through tactile graphics or verbal description.
