I had FDT a number of times--because they could never get a consistent
result. I suspect since the machine was new the technicians weren't
properly trained, or else it doesn't work well with high myopes.

With the FDT, you have to click the button when you detect little
squiggles of lines, rather than lights. If you consider other visual
field tests torture, you probably won't like this any better expect
that the one I took was quicker. I found it harder than than just
clicking at lights; because I have so many floaters and also because my
dominant eye tries to take over even when covered, I was mostly just
guessing at whether I thought I saw a squiggle or not. With me they
never got a useable result--it usually showed worse defects in my
normal eye than in my eye with the defect, and repeat tests would show
defects in areas that were normal before, and vice versa. The person
after me, who was maybe 30, went through the test click click click in
probably a tenth of the time it took me so I imagine for most people
with normal eyes, or young eyes anyway, it is a pretty easy test.
-Gudrun

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Hi!  If you google on this:

  "frequency doubling technology" glaucoma

you will get many references to this technique.

earle
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