1.   Glare and flicker from the screen can strain eyes and poor layout of workstations can cause discomfort.

2.   He strained his eyes peering into the gloom.

3.   I strained my eyes to see their faces, my ears to catch their whispered voices.

4.   Straining her eyes, Chesarynth squinted up into the sky outside the neat polished world of the dome.

5.   They strained their eyes, but saw nothing.

6.   Too much computer work strains the eyes.

7.   But, although Robert strained his eyes against the glass, he could see nothing but impenetrable blackness beyond the hectic yellows and reds cast by the candles.

8.   The Doctor strained his eyes, but there was nothing to see.

9.   For days, as I strained my eyes, everything looked like a whale to me.

10.   He spins around and strains his eyes.