astigmatism [ah-stig´mah-tizm] an error of refraction in which a ray of light is not sharply focused on the retina, but is spread over a more or less diffuse area; it is due to differences in curvature in the refractive surfaces (cornea and lens) of the eye. adj., adj astigmat´ic. Its exact cause is not known; some common types of astigmatism seem to run in families and may be inherited. Probably everyone has some astigmatism, since it is rare to find perfectly shaped curves in the cornea .

Irregular astigmatism is a type of eye disorder in which the surface of the cornea is marred by peaks, ridges, valleys, and other abnormal shapes.

Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina.

Regular Astigmatism is a normal and very frequent visual problem that is easily and accurately corrected with eye glasses or conventional contact lenses. Irregular Astigmatism is not normal and is

Since the advent of keratorefractive surgery and its rising popularity, irregular astigmatism has become an increasingly important issue for ophthalmologists and optometrists.

A Rational Approach to Irregular Astigmatism Irregular astigmatism can be a source of frustration with toric IOLs. Here's how to identify and treat the cause.

Irregular astigmatism information including symptoms, causes, diseases, symptoms, treatments, and other medical and health issues.

Astigmatism is very common. It sometimes occurs after certain types of eye surgery, such as cataract surgery. Symptoms. Astigmatism makes it difficult to see fine details, either close up or from a distance. Exams and Tests. Astigmatism is easily diagnosed by a standard eye exam with refraction test. Special tests are not usually required.

Irregular astigmatism: definition, classification, topographic and clinical presentation Ming X. Wang, MD, PhD Clinical Associate Professor of Ophthalmology of University of