Thanks for the response...and please realize, my point was NOT to poke fun at your eyes, your sight, or any health issues you may/may not have.
I did not take your post personally, so No Worries in that regard...
What did bother me is the way that you easily dismissed my experience, which I attribute to your misinterpretation of the point that I was trying to make. This isn't about Apple's "glassy" displays ("glossy" just doesn't do the job when describing the reflective nature of most Apple displays). As you know, the MBA displays are "semi-glassy" and something of an improvement over other non-matte portable Mac displays.
My discomfort is apparently caused by the LED backlighting used in Apple's portable displays; the high resolution may also be a contributing factor. If you take the time to peruse the posts at the link that I provided you will see that many people are having similar experiences. There are a number of theories offered in the thread and elsewhere on the Internet about what may be the root cause of the problem.
It appears that eyestrain associated with Apple LED displays became a problem after the introduction of the unibody MacBook Pro in late 2008. The Apple forum thread begins in August 2008 and continues to be a lively discussion today. That's over 3.5 years of posts.
I owned an early 2008 15" MBP with a matte LED backlit display that never caused me any problems. My early 2011 13" MBP also caused me some eyestrain, but I was able to reduce the problem somewhat via calibration and limiting the amount of time I spend viewing the display. I also added a Power Support anti-glare film but I don't think that it did anything to reduce the eyestrain since I son't think that the glassy display contributes much if anything to the problem.
Unfortunately, Apple has not publicly responded to user comments about the display problems.
Granted, it appears that most people are not affected. But if you happen to be one of those that are affected it can be distressing to have spent a lot of money on a computer that is literally painful to use. And some users haven't figured out what is going on until it is too late to return the computer for a refund. Some people have gone to considerable trouble and expense going to doctors since they assumed that they had a health problem, not a computer display problem. After getting a clean bill of health it became apparent to them that the display is the source of their eyestrain, since their eyes are otherwise fine.
So my intention in posting this information is to provide a "heads up" to people shopping for a portable Mac. Be sure to purchase the Mac from a retailer with a good return policy and give the computer a thorough workout immediately after purchasing it. If you have a problem with the display it should become readily apparent in a relatively short period of time.
For my part I am keeping an eye on upcoming changes in the displays in the anticipated MBP updates. I am also sticking with CCFL backlit external displays since I have no way of knowing whether or not a particular LED backlit display will cause me problems. I don't relish the thought of repacking a huge LCD display and shipping it back to a retailer. Fortunately there are some manufacturers such as NEC that offer a variety of CCFL backlit displays in the budget, mid-level and high-end price ranges.