We are not designed to sit in front of computers all day. In fact, we are not designed to sit for as long as we do. The human body is constructed to move all the time but in today's environment we tend to sit for most of the day and hold our focus on the computer screen. Employers do not pay employees to look out the window.
If muscles are locked into one position for extended periods of time they tend to lock or cramp. If positions are held for a long time, the body ( the structure) adapt to what we are doing and this is expressed in this formula.
Function, what you do will influence structure, your body.
This is a fundamental fact of physiology. So the visual system is stressed, we need to remove the stress as a basic first step.