The perception of little dots, strands, “spidery-like” images
that are noticeable under certain lighting conditions. As we age, the
normally transparent vitreous gel liquifies and forms little particles
and fibrous strands. This debris accumulates in the gel and becomes suspended.
When light enters the eye, those strands and debris cast shadows onto
the retina. They are usually harmless. However, showers of spots or abrupt
increase in the numbers of spots can be a sign of a retinal tear, particularly
if associated with photopsia
(please see this section). This demands immediate evaluation by an ophthalmologist.