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Figure-Ground Perception. Figure-ground perception is the ability to focus on one specific piece of information in a busy background. Visual figure-ground is the ability to see an object in a busy background; while auditory figure-ground helps a child pick out a voice or sound from a noisy environment. This article deals with the visual perceptual skill and offers some activity ideas to inspire parents and teachers!
What is the Purpose of Prism in Eyeglasses? The simple definition of a prism is a solid object that has the same cross-section along the entire length of its shape. When you cut straight across an object, the cut portion is called a cross-section. Draw any shape using straight lines. Now use your imagination to see it extend upward and that is a prism. In eyeglasses, prisms are used primarily for double vision, positional correction, or convergence correction. Double vision (diplopia) is when a viewer sees two individual images using both eyes, instead of the one most people see, merged together by the brain.