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Eye doctors use a variety of tests and procedures to examine your eyes. These tests range from simple tests, such as reading an ophthalmic plate, to complex tests, such as using a high-powered lens to make a visual image of the tiny structures inside your eyes. A comprehensive eye exam can take an hour or more, depending on the doctor and the number and complexity of examinations required to fully assess your vision and eye health. Here are the eye and vision tests you're likely to undergo during a comprehensive eye exam: