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  • Photo slide projectors designed for projection on a screen one slide from a set of positive images mounted on transparent film (i.e., eye charts) that are intended for visual function assessment. These projectors usually consist of electric powered equipment that includes a power supply, lights (e.g., halogen), lenses, electronic circuitry, controls (e.g., focus, brightness), screens, and sealed slide holders (e.g., discs) and/or carrousels carrying a set of multiple eye charts; the projector may include other attachments that permit the projection of the eye chart\'s images with the appropriate size, definition, and brightness adequate for visual assessment. Some projectors may include as a component the screen intended for projection of the images. Eye chart projectors are used for screening and evaluation of a patient\'s visual function in doctors\' offices and other areas of healthcare facilities.
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