what is a double astigmatism
Astigmatism is an eye condition with blurred vision as its main symptom. The front surface of the eye (cornea) of a person with astigmatism is not curved properly-the curve is irregular-usually one half is flatter than the other-sometimes one area is steeper than it should be.When light rays enter the eye they do not focus correctly on the retina, resulting in a blurred image.auses of astigmatism. Corneal astigmatism. The cornea is a clear (transparent) layer of tissue that covers the front of the eye. As well as transmitting and focusing light into the eye, it protects the eye from infection and damage.