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    • 16 MAY 16
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    What is astigmatism?

    Astigmatism is an optical condition that creates different points of focus. As a consequence someone with uncorrected astigmatism will experience blurred vision.

    This uncorrected visual blur results when the front optical surfaces of the eye are not spherical. A spherical optical surface bends images evenly resulting in equally focused images within the eye.

    no astigmatism

    Spherical surfaces focus images equally

    The non-spherical astigmatic eye is curved unevenly so images are bent unequally and are observed out of focus.

    astigmatism

    Non-spherical (astigmatic) surfaces focus images unequally

    For the most part astigmatism can easily be corrected with glasses, contact lenses and laser vision correction. Patients with cataracts can have their astigmatism corrected with femtosecond laser technology concurrent to cataract surgery.

    There is a variety of high astigmatism that is associated with corneal disorders such as with keratoconus. With keratoconus the eye develops a pathological stretching and take the shape of a teardrop.

    keratoconus

    Tear drop cornea of keratoconus

    Tear drop cornea of keratoconus

    Astigmatism in these cases may need specialty corrections.

     

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