Wed Dec 19, 2018 11:07 am
I had to "transition" from single power lenses to bifocals at age 37, and less than 2 years later, to trifocals. My friendly optician persuaded me to try progressive lenses, which I did, for a year. Hated them. There are too many places in progressives which are nobody's prescription, and I'm not a very good owl. So I went to regular trifocals.
But at the time, I was flying a Mooney a lot, and its panel is closer and at a different height than a Cessna panel. So the method was to sit in the cockpit and use a Sharpie to mark where I wanted my lens segments to be, and then use a tape measure to measure from my eyes to the panel to decide how powerful to make the middle segment. My optician followed what I wanted. Worked like a charm.
Now, though, since I fly Cessnas pretty much exclusively, I have no need for customizing, other than to make sure that the top of the middle segment is where I want it--the rest falls into place. So I have 3 sets of glasses, my normal everyday pair, my night-flying pair which stay in the airplane, and my sunglasses. All have the segments in the same place, but both the night-flying and sunglasses are larger lenses, which I prefer in the airplane. My sunglasses have gradient lenses, darker on top and lighter on the bottom, so that I can see to read charts and the instruments easier.
Everyone's experience is a little different. From my perspective, having glasses that work well are worth the extra cost, instead of trying to modify off the shelf Walgreens specials.
Cary