Can't believe no one had said this but your vision won't 'degrade' by looking at screens. That's a myth, you can look this up, you can't permanently damage your vision looking at a screen like this.

Worst that will happen is eye strain, because focusing up close requires the muscles that pull on your lens to exert themselves for extended periods of time. Worst thing this will do is just give you a headache. Your eyes might also be dryer since you will blink less often. Best thing to do is just take breaks every once in a while.

Someone has mentioned that bright light also stimulates a hormone the prevents nearsightedness, from what I remember this is only valid during your growing years. Idk, look this up if you're interested, you should be able to find some studies.