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Many traditional OMR devices work with a dedicated scanner device that shines a beam of light onto the form paper. The contrasting reflectivity at predetermined positions on a page is then used to detect these marked areas because they reflect less light than the blank areas of the paper.
Some OMR devices use forms that are preprinted onto "transoptic" paper and measure the amount of light which passes through the paper; thus a mark on either side of the paper will reduce the amount of light passing through the paper.
OMR is generally distinguished from optical character recognition (OCR) by the fact that a complicated pattern recognition engine is not required.