@double_barrel: assuming you are in the US? My AME measures depth perception with his vision testing machine. There are tests for this. You can go to your local eye doc or eyeglass place and be tested (with your preferred vision correction) without "alarming your AME"
That's what I do every year (Class II medical). In fact I've got my yearly eye exam set up to be one month before my medical is due every year. That way my prescription is tip top before I go in to see the AME.
Also, it's a very personal decision what works best for you. Like I wrote above, when presbyopia hit I tried pretty much everything. I went with what worked the best for me, which is plain old bifocals. By making them the right strength (and putting the split of the lens in the right place--I like it a little lower than most) I can see 16" 20/40 with the bottom part, and 32" 20/40 with the top part (and 20/20 distant vision, of course). I'm happy with that and it meets the US Class II requirements for old guys
