Give me a simple definition of astigmatism?

Answer:
A refractive defect of a lens or other optical system that prevents light rays from converging at a single point, resulting in a blurred or imperfect image.
A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.

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Astigmatism is a vision condition that occurs when the front surface of your eye, the cornea, is slightly irregular in shape. This irregular shape prevents light from focusing properly on the back of your eye, the retina. As a result, your vision may be blurred at all distances.

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a distortion of the image on the retina caused by irregularities in the cornea or lens:))

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Astigmatism is the result of an inability of the cornea to properly focus an image onto the retina. The result is a blurred image.

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a defect of an optical system (as of the eye) that prevents light from focusing accurately and results in a blurred image or unclear vision

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Get the right definition, go to WEBMD!

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As a sufferer of this eyesite problem,it's been explained to
me that this is condition caused by irregularities in the
thickness of the lens of the eye.Much like looking through
a glass of water.
Prior to the days of laser surgery,I've been told that this
problem was not curable,only correctable.
With the advent of this type of surgery that situation has been pretty much eliminated.

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1. A condition of unequal curvatures along the different meridians in one or more of the refractive surfaces (cornea, anterior or posterior surface of the lens) of the eye, in consequence of which the rays from a luminous point are not focused at a single point on the retina.
2. A lens or optical system having different refractivity in different meridians.

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Abnormal curvature of the cornea or the front or back of the lens of the eye. This results in the eye's inability to focus sharply.

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