Left eye. It's my dominant eye, meaning it's the primary eye that I use for vision. This may come as a surprise to most readers, but nearly all of us have dominant eyes. Normally, the dominant eye is on the same side of you as your dominant hand. So, most right handed people are right eye dominant and vice versa. I'm part of the 20% of the population that is cross-dominant, meaning that I'm right handed but my dominant eye is my left eye. Curiously, my vision is weaker in my left eye than my right eye, although with glasses it corrects to 20/20.
Here's a simple test to determine which of your eyes is the dominant one. Extend your dominant arm completely and raise the first finger. Look at it with both eyes. Close one eye while watching the finger. Then, open that eye and close the other eye. Does the finger appear to move when one of your eyes is closed and remain still when that eye is open and the other is closed? When the finger doesn't appear to move you're looking at it with your dominant eye.