me and the Doc got into a discussion about pds being OU no matter what on a ft. I refuse to make them ou because in my mind not feeling cross eyed trumps 1-2mm physical alignment of the read line. the other optician agrees with me as well....
just curious to your thoughts on the matter.
SlimDizzle
In my experience, most patients are much more bothered by the off-balance cosmetics of edging FTs monocularly, than by any visual issues if I were to edge them symmetrical with binocular PD. That being said, there are exceptions to every rule, but so far I have never had anyone complain of a cross-eyed/clarity/convergence issue when I split the FT PD's even, but I have had people complain when they look at the glasses and see the segs are not symmetrical.
Patient, ".. Doctor says I have a subscription for stigmata.. Can you fill that?"
Me, "..Um.. "
if they were -0.25 i could see it not making a diff, but say they were a -4.25/ -1.75 and what ever add... Im not blind myself, -1.75 & -1.00 and the smallest pd diff makes me batty when i switch glasses.
You can specify a monocular DRP with a binocular NRP in a FT, the insets would differ but you get the advantage of accurate PD in the distance portion and aesthetics in the near. If seg alignment and seg area are issues; then use a FT35 instead of a FT28.Originally Posted by Slim
That's what I do, but I tell the client what I'm doing, and why. I've never had any one object. But if their not informed, all bets are off.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
Opticianry 101 - Simply ask your patient if they want to see their best, or look their best. Vanity may win out, but usually vision is the paramount concern I find. Also, you can further reduce the appearance of the ft with a quality AR, in addition to helping the pt's likely reduced contrast sensitivity. As close as it gets to the best of both worlds.
Mono FT PDs all day long. AS a Lab, you may not have the front line opportunity to discuss this with the end client.
But I do. And its mono PDs for you!
B
do it the easy way, use dualenses, better known as executives
Our job is to educate our patients, not to cave in to their vision-compromising ignorance.
haha love that answer!
^Yup.
If split PD's are unequal, and you equalize them, you are in essence inducing prism at the MRP. Unprescribed prism BTW.
And if they are THAT picky that they are more concerned as to what others may think, then perhaps they should shop elsewhere?
Everyone has valid points, and as opticians, we have to make informed decisions in the hopes of providing best possible vision to our patients. In the 15 years I've been making/selling eyewear, I think I have only seen a PD with a monocular variance over 3mm maybe 5 times. So IF I am adjusting a PD, it's by 0.5mm - 1.0mm at the most. Progressive lenses have a heck of a lot more prismatic effect inherent in the lenses than anything being induced by me splitting PDs. I take my job very serious, and I am really good at it, but I strongly feel that overall, as an optical community we are extremely defensive, and feel the need to over complicate things to make it feel like this job is way more complex and intricate than it really is. Yes, we are dealing with physics, and light theory, and there are so many factors that come in to play with each individual patient's experience, and we need to understand all of those things. But seriously, lighten up folks. No one said "split all PDs no matter what". Obviously we all know that every situation has exceptions, and there will be times when cosmetics don't factor in.
Patient, ".. Doctor says I have a subscription for stigmata.. Can you fill that?"
Me, "..Um.. "
see if I could be out front all the time and I had a PT with a 3mm PD difference, Id figure out why I got that... do they have a crooked nose or other injury? or maybe use the nose pads to make sure things are even.. I think alot diff than most... I WISH i could get my opticians to get 'into it' more. I should make them all spend a day in my lab to see the mechanical and why side of things.
AND.... Id throw the damm pupilomiters in the trash! I wanna smash those things. the one Op got a pd of 36 and 28 and rechecked it 5-6 times... good ole marker and a steady hand got me a pair of 32's... they are not reliable at all.
They are reliable, they just need to be used correctly. The fact that it produced the same erroneous result 5-6 times shows that its the operator not the instrument.
I do unequal seg heights and PDs on Ft all the time. My Doc learned a long time ago not to question why I do things the way I do.......
"Coimhéad fearg fhear na foighde"
Back before pupilometers(at least where I worked) I measured PDs with a ruler and fit plenty of flat tops. I always did OU PDs and the same seg height and can't ever remember there being a problem.
Now I use a pupilometer and mainly use mono PDs with flat tops. I still use matching heights most of the time but not 100%. And it works this way, too.
If both scenarios work, then why not provide aesthetics, balance, yin to the yang? Not necessarily a question just for you, really a question as to why an uneven set would be used in non extreme circumstances.
If you can compromise the optics in favor of aesthetics without exceeding ANSI standards, then go ahead.
All of our opticians are now required to get trained in the lab for that and other reasons. So far we've noticed great success.
thanks Dave... gonna have to make that happen!
They can get out of alignment. I always double check PDs for progressives, higher RXs, and anything that seems off with a penlight and marker.
do we still make ft's? lol
my dad says, "one in every 100 pairs we dispense today are ft's." He only has 47 years experience. And so it's a moot point.
Thanks Mike, it was waaay past my bedtime. Yes, I'm a dork.
Last edited by eyechick1969; 08-08-2013 at 10:03 PM. Reason: To Thank MikeA
Desperately trying hard not to be a word cop, but the word you want is MOOT, not mute. A mute point would be a silent one, a moot point would be one that has no argument.
lol
There are currently 1 users browsing this thread. (0 members and 1 guests)
Posting Permissions
Reply With Quote
Bookmarks