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Visual acuity is a subjective test meaning that if the patient is unwilling or unable to cooperate, the test cannot be done. A patient who is sleepy, intoxicated, or has any disease that can alter their consciousness or mental status, may not achieve their maximum possible acuity.
High quality camera – In May 2020, the 12.3-megapixel Sony IMX477 Exmor sensor camera module was released with support for C- and CS-mount lenses. [262] The unit initially retailed for US$50, with interchangeable lenses starting at US$25.