We don't understand squat about how the eye works.
You are trying to ascribe the same sort of knowledge we have of the physical structure of H2O to something as complex as the eye. We are only now starting to understand many of the issues which are involved: but it's clear from the studies done that ambient lighting and colour balance compared to the reading medium are important.
Saying "poor reading habits" rather than looking at the fact that you might be looking at an overly bright, poorly colour-balanced CCFL-lit LCD screen as the whole cause of eyestrain...
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