Astigmatism is a type of refractive in which the eye does not focus light evenly on the retina. This results in distorted or blurred vision at any distance. Other symptoms can include eyestrain, headaches, and trouble driving at night.
The cause of astigmatism is unclear, however it is believed to be partly related to genetic factors.The underlying mechanism involves an irregular curvature of the cornea or abnormalities in the lense of the eye.
This means that the eye or eyes affected, which I have Astigmatism in both eyes, will cause blurred unfocused vision.
Diagnosis is by an eye examination.
One Vision Blog 