[citation][nom]jacobdrj[/nom]Eyestrain is a myth. Not a 1000 textbook.You try holding a 1000 page textbook with 1 hand so that 1) the light is right and 2) you finger is on the page...Unless you are a professional weight lifter, I doubt you can do it for more than 10 minutes...[/citation]
dont know about you, but i usually am sitting comfortably when i read, usually elbows are rested. a 1000 page book, i believe that It is close enough to 1000 pages, i know at least 900 and at most 1300. i didn't come into much problem holding that and reading it, because im not reading it in the most uncomfortable possession possible.
eye strain is real, but is mitigated by an lcd, and further by a higher hrz, and a bit more by less back lighting, and reading in a lit room, but its always there. it doesn't alway present as tired eyes, here this is a direct copy paste from wiki
************Asthenopia (aesthenopia) or eye strain is an ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache and occasional double vision. Symptoms often occur after reading, computer work, or other close activities that involve tedious visual tasks.
When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscle tightens. This can cause the eyes to get irritated and uncomfortable. Giving the eyes a chance to focus on a distant object at least once an hour usually alleviates the problem.
A CRT computer monitor with a low refresh rate (