Just now,I just noticed something very strange. It seems when my heart beats, everything looks ever so slightly redder for a bit. I have never noticed this before. Maybe it doesn't happen all the time. It was very subtle, and seems to have stopped. I think.
. . .That's pretty hard to quantify.
Because your heart never stops beating. Ever. :/
Death and some heart attacks can.
The other heart attacks make your heart beat TOO quickly, so not enough blood is pumped around the body.
Since I suddenly felt my heartbeat, maybe my blood pressure went up for a few seconds? Perhaps the increased blood flow to the capillaries in my eyes caused the reddish tint?
This is an unusual thing, and could possibly be a symptom of a problem with your retinas or your heart. You do have blood vessels in your eyes and some of them are placed in some people so that bloodflow can be observed in ideal lighting conditions, or sometimes by pressuring the eye by squinting and such.
I can see my pulse under ideal lighting, but only during and right after a heartbeat. It is colorless (these are very small blood vessels) and looks like a shadow of movement in specific spots. I've been able to see it, rarely, from childhood.
That you don't normally observe this, or feel your heartbeat (and some people can and do feel their heartbeat most of the time or periodically), be aware of these changes, and consider getting yourself checked. If you are starting to have a lot of blood vessel growth in your eyes or something, this can be extremely bad for your vision and its easier to correct early rather than late.
Feeling your heartbeat is often called palpitations. That's a rather more common symptom than suddenly seeing your heartbeat, but their being linked isn't common. It's worth mentioning to both the eye doctor and the regular doctor, because the combination could be significant.