The cognitive impairments caused by supranuclear palsy lead to behavioral problems, and people gradually lose planning and problem-solving skills. Abnormal eye movements worsen over time, until voluntary motions become impossible. People can no longer read because they cannot focus or follow lines of text. They also have difficulty opening and closing their eyes, leading to infrequent blinking, and the eyelids start to pull away from the eyes. Eyesight deteriorates to blurry vision, sensitivity to light, and eventual blindness.

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