Is Astigmatism Causing Your Blurry Vision? (Ezine Ready)
Instead it has an oval shape or an irregularity of shape caused by a scar on the cornea or some defect in the lens. An oval shape has two curvatures: A steeper curvature on its short side; and A flatter curvature on its long side A scar or other irregularity also has several curvatures.
Each curvature bends incoming light differently, giving multiple images on the retina or in front of it. Blurry vision is the result. Astigmatism Testing Your comprehensive visual examination with a qualified ophthalmologist measures how the eyes focus light. This helps your eye doctor to determine the prescription that will help to correct your blurry vision. Some of the sophisticated diagnostics used at Bellevue Lasik and Cornea in Seattle, Washington include: Visual acuity -- This is done through a phoropter, where the chin and forehead rest against the designated surfaces and you look through an aperture at the Snellen chart. The eye doctor or his assistant flips between different lenses, asking you to read the smallest line of letters you can see. This test measures your eyes’ refractive error and yields a corrective prescription for glasses or contacts. Keratometry -- A keratometer measures corneal curvature.
A circle of light is focused on the cornea and its reflection is measured.
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