It can vary, but a typical size is 60 feet wide by 30 feet high.
Frontal Eye Field
If the stadium is strictly a baseball stadium, there won't be any seats in center field, and if it's a multipurpose stadium they will be covered, and unused. This is done for the batters... That area is what is known as the "batters eye" which means it's the direct view of what the batter sees from home plate. It's generally a dark color (so the ball can be easily picked up from the pitchers hand), and if there is a video board, it is on a fixed picture during an at bat.
I assume "batter board" is another term for "Batters Eye" in center field. If not then this answer will not apply to your question. The Batters Eye is for the batter to have a "backdrop" that will allow him to see the baseball come from the pitchers hand. Generally these are green or black because they allow the white ball to be seen easily. If you are in the outfield on a line drive hit to you, then you might appreciate having this as when you are at bat. A white ball being thrown at you 80-90mph that you cant see because someone in the center field bleachers is wearing a white shirt right where the release point is for the pitcher would not be a good thing.
conjunctivitis
When you look through one eye or both eyes, it doesn't matter because the world that we know always has three dimensions; length, width, and height.The difference is that when you look through one eye your brain doesn't get as much information to be able to determine width or depth, which is considered the third dimension. It only gets information to see length and height. And, to see the fourth dimension, time, all you have to do is look at something with three dimensions ans wait for it to move. Movement involves time, so if you close one eye and look at things moving, you are actually seeing infour dimensions with only one eye!
A person with one eye sees in two dimensions rather than three. That all important third dimension, depth of field, is missing.
I Don,t Know, But Sandy Duncan Apparently Has A Glass Eye.
it doesnt
Except goal-keepers no other players wear face or eye protection.
Yes, one eye only produces a two dimensional image.
It is a technique based on geometry that tricks the eye into seeing depth
No, but it can give you better hand and eye coordination