I made this copy because I had something to offer, so I left the original one in the 'Ask Robert' section.
You are not going crazy.
The human eyes have a blind spot in peripheral vision (there is an exercise to test this that eye doctors use). We don't notice gaps in our sight because our brains are wired to maintain stability in our vision, so the blind spots are usually 'filled in' by the 'imaging department' in the brain. This is normal for everyone.
But sometimes, when people start studying consciousness practices, such as 'being present', meditation, and other varieties of this type of thing, there may be a side effect, that affects people differently- they start 'seeing' the glitches in the senses. And then stuff like moving objects (caused by retinal fatigue, and other types of things) and shadows in peripheral vision, because, let's face it, there are shadows in our peripheral vision. And when we become 'hyper aware', we momentarily 'see' the gaps and the brain's efforts to cover them up, and then this effect becomes weirder.
So don't worry Fidel, you're normal- just more aware than you used to be.