Further, African Americans did not have the freedom to choose where and how to live due to the effects of state-sponsored restrictive covenantsâlegally binding contracts making it illegal to rent, sell, or lease housing to black people (in some regions it included other nonwhites).
Nonarteritic anterior ischemic optic neuropathy (NAION) is the most common clinical presentation of acute ischemic damage to the optic nerve.Most treatments proposed for NAION are empirical and include a wide range of agents presumed to act on thrombosis, on the blood vessels, or on the disk edema itself.onarteritic anterior ischemic optic neuropathy (NAION) is the most common clinical presentation of acute ischemic damage to the optic nerve.
Questions and Answers forThose Affected by NAION From the leaflet by Claud Regnard and Margaret DayanNewcastle upon Tyne, UK What is NAION?What we see of the world is focused onto the back of our eyes onto the lining at the back of our eye (the retina).The retina converts the image into electrical impulses which travel through the optic nerve (the nerve of sight) to the brain.The optic nerve is supplied by very small blood vessels, and it is the blood flow in these blood vessels that is affected in NAION.he blood supply to part of optic nerve is reduced, resulting in damage to the nerve fibres and this causes the loss of some of the sight in the eye.What causes NAION?Despite many theories and suggestions, the exact cause of NAION is not known.