Astigmatism: sharp vision at any distance
Astigmatism causes blurred or distorted vision near and far, due to an irregular curve of the cornea or lens.
Symptoms
Blurry vision, eye strain, headaches and trouble seeing at night.
Diagnosis
Refraction and corneal assessment; if it changes quickly, keratoconus is ruled out.
Correction
Glasses or contact lenses, with regular checks to keep the prescription current.
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