<span>The blindness is considered sudden if the loss of vision develops within a few minutes to a couple of days. It may affect one or both eyes and all or part of a field of vision. </span>Sudden loss of vision can occur for a number of reasons. The most common causes of sudden loss of vision are physical: damaged retina, Blockage of a major artery of the retina,<span>Eye injury... </span>But, <span>tests have shown no physical basis for his symptoms. So, the diagnosis can</span> some serious medical conditions such as a stroke or brain tumour.
