(Greek meaning darkening
, or obscure
) is vision loss
or weakness that occurs without an apparent lesion affecting the eye
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
Leber's congenital amaurosis
is an inherited disease resulting in optic atrophy and secondary severe vision loss or blindness. It 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 (thiamine) deficiency due to Thiamine-Related Cerebrocortical Necrosis (CCN).
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.