MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Eye examination. Optician using a keratometer to measure the curvature of the cornea of a patient's eye. Measuring the degree of irregular curvature allows an assessment of the severity of the condition, known as astigmatism, and hence what treatment is appropriate. For mild cases, corrective lenses can be prescribed. For severe cases, surgery may be needed.
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