Hi Jolie,

You currently do not have enough information to be able to calculate the eye level height. In the following diagram H is the height of the screen, E is the eye level height, D is the distance from the viewer to the screen, h is the visual angle and e is the angle of depression (angle from the line of sight to the bottom of the screen).

The formula for visual angle

can be rearranged to solve for the height of the screen

We can use the following relation between the height of screen H and the eye level height E

then rearrange it to solve for E

As you can see, we are missing the angle of depression e so eye level height cannot be solved.

Hope this helps,

Janice