11. Eye strain , light-headedness and a Costas-intolerance are all common symptoms.12. But he gave up engraving because of eye strain . 13. The MKH method claims to reduce eye strain -related symptoms. 14. Glare and brightness ratios provide guidelines for lighting schemes within libraries to minimise eye strain . 15. Pure black and pure white background are known to cause eye strain for normal users. 16. The results might suggest that early eye strain promotes nearsightedness, which would reinforce Kennebeck's belief. 17. Failure to heed this advice may cause eye strain . 18. :You can get eye strain reading a book for too many hours in a row too. 19. The program is free software, and is intended to reduce eye strain as well as insomnia. 20. Remember eye strain , command lines, tape recorders and cassettes for data storage and archaic machine symbols?
