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On Sat, 12 Nov 2005 23:30:49 GMT, "Deane Judd"
wrote in : : I use trifocals. Got them because I wanted to see the instrument panel for IFR without having to twist my head from side-to-side (vertigo inducing) and also see approach plates up close. I also spend a lot of time in front of a large computer screen. Two things make them work for me: 1) The middle lens is set to focus at about 18" (~instrument panel and/or CRT distance), which I believe is a bit non-standard, and 2) the middle lens is 10mm high, which is very non-standard. They'll try to tell you that 7mm is all that is available, but this is not true. Settle for nothing less than the 10mm height. That plus insisting that the frames are adjusted perfectly so the left and right eyes are always looking through the same near/middle/far lens makes them easy for me to use and adjust to. The top of the middle lens appears about 10 degrees below my horizon, which I find about right. I agree completely. During instrument training, I found trifocals necessary to deal with my nearsighted and farsightedness. I had the optician make the middle segment 12mm high and position it so that the top of it is higher than normal, positioned where the windshield and control panel meet while I'm looking out the windshield normally. The bottom segment is only used for reading the finest print on the chart in dim illumination. |
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