Astigmatism causes different amounts of blur in different directions.
This causes images to appear distorted, or sometimes doubled due to curvature of the cornea and the lens.
Certain letters may be more difficult to read than others, depending on the orientation of the lines within them.
Astigmatism will effect how light enters the eyes and is focused. Whilst it is extremely common it ideally should be corrected depending upon the magnitude so as not to cause blurred,distorted vision or uncomfortable vision which can impact your visual acuity.
To focus light glasses or contacts have to correct in all directions.
Astigmatism is common together with short-sightedness (myopia) or long-sightedness (hyperopia) in an eye exam.
Vision correction often utilises contact lenses to reshape the cornea. Astigmatism can also be corrected by glasses, or laser eye surgery techniques (assuming healthy corneal profile and eye care) LASIK, ASLA and SMILE to rectify the curvature of the front of the eye.
Sometimes optical errors can be overcome when the eye’s natural lens is removed and replaced with an artificial lens including people with astigmatism. Residual errors can be overcome by glasses or a contact lens.