Daughter, student, viewing screens constantly, complained of headache, tired eyes and restless sleep. Asked for 'blue light blocking' glasses, so after some research find Ocushield, a highly thought of manufacturer of glasses for the relief of the effects of over-looking of computers, laptops, phones and other electronic displays. Easily ordered, some variety of styles, quick delivery. Result? After some weeks of use daughter still as bound as ever to laptop screen for study, but owing to use of Ocushield glasses have heard no further complaints of physical discomfort. So, success (and recommended)!