AskDefine | Define amaurosis

Dictionary Definition

amaurosis n : partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain

User Contributed Dictionary

English

Noun

  1. Any form of blindness that is accompanied to no obvious change to the eye; often the result of disease of the optic nerve

Related terms

Extensive Definition

Amaurosis (Greek meaning darkening, dark, or obscure) is vision loss or weakness that occurs without an apparent lesion affecting the eye http://www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_a_27zPzhtm. It may result from either a medical condition or from excess acceleration, as in flight. The term is the same as the Latin gutta serena.

Types

Leber's congenital amaurosis is an inherited disease resulting in severe vision loss or blindness that was first described by Theodore Leber in the 19th century.
Amaurosis fugax (Latin: fugax meaning fugitive) is a temporary loss of vision in one eye caused by decreased blood flow (ischemia) to the retina. Another cause is the presence of emboli located in the ipsilateral(same side) internal carotid artery. It is a type of transient ischaemic attack (TIA). Those experiencing Amaurosis usually experience complete symptom abeyance within a few minutes. In a small minority of those who experience Amaurosis, stroke or vision loss has resulted. Diabetes, hypertension and smoking are factors known to increase the risks of suffering this condition. It also can be the result of surgical repair to the mitral valve, when very small emboli may break away from the site of the repair., while the patient's tissue grows to cover the plastic Annuloplasty band.
This condition can also occur in ruminants suffering from a vitamin B1 (Thiamin) deficiency due to Thiamine-Related Cerebrocortical Necrosis (CCN).

Management

Those experiencing amaurosis are usually advised to consult a physician immediately as any form of vision loss, even if temporary, is a symptom that may indicate the presence of a serious ocular or systemic problem.
amaurosis in German: Amaurose
amaurosis in Norwegian: Amaurose
amaurosis in Chinese: 黑蒙
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