From Longman Dictionary of Contemporary Englisheye strainˈeye strain noun [uncountable] MIa pain you feel in your eyes, for example because you are tired or have been reading a lot
Examples from the Corpus
eye strain• Unfortunately, though comprehensive on training, it said nothing about eye strain!• But many find they help to maintain alertness and reduce headaches and eye strain from close work.• VDUs are suspected by some of causing eye strain, postural problems and even of spreading harmful radiation across the room.• If you develop eye strain it might be because you are reading too close to the printed page.• Headache from the inability to focus the eyes rapidly enough, from eye strain.• As she describes the irritating eye strain, Estrada laughs self consciously.• The colour graphics are reasonable and quite large so you will have no problems with eye strain. 