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We examined the process of learning to see in three congenitally or early blind patients who acquired varying degrees of sight after surgery. When we first asked them to recognize geometric solids such as cube, cylinder, cone and tetrahedron using vision, it was found that this task was too difficult for them. They were unable to discriminate between pairs of these objects or identify them, even though they had the visual ability to identify two-dimensional forms. We therefore started to help them learn to discriminate several types of geometric solids and then to identify each of them. The learning processes involved in attaining successful discrimination and identification are described here. This study reveals the difficulty in transitioning from a two-dimensional to a three-dimensional knowledge base. |
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