You glance up at a blue sky and notice something dark drifting across your view. Or maybe there’s a fixed, shadowy patch that doesn't move at all. Or perhaps a dark curtain seems to be creeping in ...

Dark spots or squiggles drifting across your field of vision are called floaters. Floaters are more common as you age, when a substance called vitreous gel begins degenerating. These dots in your ...

Noticing dark spots or threads in your field of vision becomes more common with age. Seeing a line, spot, or thread drift across your field of vision can be distracting, to say the least. Known as ...