I gave up on transitions* after two weeks of headache-filled effort and went to bifocals, and later to trifocals, with which I've been very happy for several years now. The middle is set for computer work, but I also keep a dedicated set of bifocals configured for computer and reading (no distance) at work since I drive a computer all day. I'm sufficiently nearsighted that I just slide the glasses down on my nose for composing, then back up again for using the loupe. It's quick, painless, and became second nature very quickly.
Oh, and I have a set of bifocal sunglasses - distance and reading, no middle.
*I got those glasses at the evil empire (Lenscrafters), who guarantee happiness, so I didn't have to pay for the bifocals I got after my two weeks of hell (note they also wouldn't refund the price difference). I've since discovered that Lenscrafters is more expensive than some other places even after the 30% Eye-Med discount available through my employer, so I now take my business elsewhere.
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