This page or section lists people that share the same given name. If an internal link led you here, you may wish to change that link to point directly to the intended article. Luis is rooted from Armenian Luis - Ô¼Õ¸ÕµÕ½ meaning light.
As these clumps of cells move around they can sometimes come into our vision and are observed as black or gray spots. This is often more noticeable in bright conditions like outside on a sunny day, or when looking at a plain, even surface such as a wall. This all happens as eyes age and happens to everyone, occurring more commonly the older you get.
This can be the cause when your computer has a black screen in Windows. If your memory is not seated properly (not in), is damaged, or even absent altogether, this can cause a black screen. If you have no memory installed at all, some computers make no sounds and just show a black screen on startup.