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The tendency of one eye to turn upwards is called

  1. ciliary body

  2. hyperphoria

  3. iris

  4. canthi

The correct answer is: hyperphoria

Hyperphoria refers to the tendency of one eye to turn upwards. This can occur due to a muscle imbalance in the eyes, leading to one eye being higher than the other when looking straight ahead. The other options are incorrect because: A. The ciliary body is responsible for changing the shape of the lens within the eye to help with focusing on near objects. C. The iris is the colored part of the eye that controls the size of the pupil to regulate the amount of light entering the eye. D. The canthi are the corners of the eye where the upper and lower eyelids meet.