Since the beggining of last week, my left eye does this thing about twice a day, where it just pulsates, and my friends say they cant see anything, and they cant see any eye movement, but i can seriously feel my left eye beating like a heart! :S
Strange, huh?

Is it beating or twitching?
Like a spasming. Cuz mine has been doing the same thing, started about 2 days ago.
The weird thing is, it would do it only when I shut my eyes tight then open it, and it would be just my left one.
It's very odd.
Hope it doesn't become permanent.

ineedtoknow,
I also found this on another sight:

You have described new-onset orbital pulsations. Doctors tend to organize the causes for these based on the patient’s age. Newborns and young children tend to have orbital pulsations due to different reasons than young adults and senior citizens.

You should make an appointment to see an ophthalmologist who can document these findings, identify a cause and, if necessary, coordinate any necessary treatment.

It will be important to confirm whether the pulsations originate in the orbit (the bony cavity which holds the eyeball), inside the skull, or from a more distant site. Don’t be surprised if your doctor places her stethoscope over your eyeball in an effort to listen to the bloodflow.