Eye strain= burning, red/bloodshop, itching eyes after working hours

I've been working on my macbook everyday for hours and have been experiencing significant eye strain. After a nights sleep, eyes are better. Yet, after working on the computer after a few hours....it comes back. This has never happened before and am wondering if it's the type of display/lighting.
I read some other posts and decided to try and calibrate. I changed the lighting to yellowish for graphic work.
Has anyone else noticed this problem. I thought it might be from the smaller 13" screen, which I've never used before. Always used a much bigger screen.
Any words of wisdom out there?

A small number of people do report having issues with the LED backlighting used in modern LCD displays. This is "believed" to be due to the way the LEDs are dimmed. LED dimming is actually simulated by blinking the LEDs on and off very quickly (as they can't actually dim in the truest sense). The frequency changes based on the dimmed level. With the display at full brightness, the LEDs are generally constantly "on". Some people believe the rapid flashing, even though not detectable, is causing the problem for them. You may want to try your display at full brightness to see if that helps. I haven't seen any significant research on the topic so pretty much everything is hearsay.

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    privacy.popups.showBrowserMessage
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    privacy.sanitize.migrateFx3Prefs
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    privacy.sanitize.timeSpan
    0
    security.warn_viewing_mixed
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    security.warn_viewing_mixed.show_once
    false
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    3.6.4
    == Operating system
    ==
    Windows 7
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    ==
    Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.4) Gecko/20100611 Firefox/3.6.4
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