Diseases

Astigmatism - Astigmatism

Astigmatism is a disorder of vision, a very common optical problem.

Astigmatism can appear at any time in life. It is due to anomalies specific to the eye that are called the lenses of the eye: the cornea, the lens. These lenses create a sharp image focused on the retina. If one of the lenses is of poor quality, the image will be blurred.

The astigmatism does not see well, near or far. Astigmatism is an abnormality of vision characterized by a bad curvature of the cornea (transparent membrane that covers the eye at the level of the iris); it is oval instead of round. The deformation can be vertical, horizontal or oblique. The same problem can affect the lens of the eye that is the lens.

Astigmatism can be congenital or acquired (that is, it appears after birth, often in adolescence or adulthood).

Astigmatism causes a blurred vision from near and far, the anomaly is more or less important depending on the deformation. An astigmatic person may also be nearsighted or hyperopic. In this case, the correction requires to take care of all these disorders. This is easily done today with the ophthalmologist, then with the optician when getting his glasses or his lenses.

Astigmatism is measured, measured in diopter, as myopia or hyperopia.

Popular Posts

Category Diseases, Next Article

Suicide: Sources and notes - Diseases
Diseases

Suicide: Sources and notes

Website of the International Association for Suicide Prevention: www.iasp.info (consultation: April 2015) Suicide. Factsheet of the World Health Organization (WHO): www.who.int (Update: September 2014)
Read More
Vaginal mycosis: the causes - Diseases
Diseases

Vaginal mycosis: the causes

Several causes can cause vaginal yeast infections. There are some that we can act on, and others we can not do much about. Here is a list of the various factors that may upset the vaginal balance, its pH ... and ultimately cause a vaginal mycosis: 1 - In everyday life Certain situations of everyday life may be involved in the occurrence of vaginal mycosis and sometimes its repetition
Read More
Cold sore: sources and notes - Diseases
Diseases

Cold sore: sources and notes

Author : Dr. Nicolas Evrard and Dr. Ada Picard. Sources : - Management of cutaneous and mucous herpes in immunocompetent patients. French Society of Dermatology, November 2001. - Item 84: Herpesvirus Infections of Child and Adult Immunocompetent, Pilly - ECN Preparation - Item 84 - © CMIT.
Read More
Aphasia: sources and notes - Diseases
Diseases

Aphasia: sources and notes

- Semiology of cognitive functions, College of Neurology Teachers. - Greener J, Enderby P, Whurr R. Pharmacological treatment for aphasia following stroke. Cochrane Database of Systematic Reviews 2001, Issue 4. Art. No .: CD000424. Author: Dr. F. Duncuing-Butlen and Dr. Ada Picard.
Read More