Originally Posted by wmcdonald
Do you suggest a certain text or reference for those of us who are unclear or rusty on the subject?
Do you suggest a certain text or reference for those of us who are unclear or rusty on the subject?
That is a assumption...........and we all know about assumptions.
A great BIG thumbs up and a LIKE button! It can not be any better stated or any more easy to understand.
Every 2 years during Florida continuing education classes we have to take a 2 hour course on medical errors. It talks about the most common mistakes that can happen. There is always a story about the an rx not being interpreted correctly. One non related optical story is when a doctor had to amputate a patients leg, but accidently did the wrong one. All do to the patients chart not being filled out correctly.
oops, sorry for the typos, lol.
If you cannot understand 3D BI OU it is not misinterpretation, it is not understanding what you are doing. With the current state of Opticianry, you may just be right however. You may even want to draw pictures.
Of course, Fezz. Borish, Clinical Refraction. You can find some variance in today's terminology, however. In the more contemporary field of vision therapy, the COVD describes yoked prism as just that, same direction. An example from the free dictionary mentions it as follows:
yoke prism's Two prisms, one in front of each eye, of equal deviation and direction (e.g. 2 ΧBU, OU). The apparent view moves towards the apex of the prisms. These are sometimes prescribed in the management of nystagmus, in visual training, for the bedridden (BD prisms) and in some cases of physical disability. (Fig. P19) Note: also spelt yoked prisms. Syn. version prisms (http://medical-dictionary.thefreedictionary.com/prism). So there is some variance in the term.
Another reference you may appreciate is as follows:
http://www.thesgassociates.com/Artic...ysfunction.pdf. It holds true to the more contemporary description of yoked prism.
I hope this is helpful to better understanding of the subject. I stand by my comment that it is not regularly used in practice and the overall effect on the typical consumer with vertical prism in the sme base direction is 0.
Thank you Warren!
Dr Sheedy did a study around 1987 on yoked prism (BD). 2D was tolerable by almost all participants whereas 4D was intolerable by most. The difference could be the VA loss from LCA's though.
It's all in the "U".
Uterque - the meaning is each eye in this scenario.
Unitas - the meaning is both in this scenario.
Uterque is the proper word for the "U" in OU so the prescription should mean the prism in both eye's not split between the eyes. Unitas would suggest split between both eyes which is not the case here. The same holds similar for a script writtten:
OU: -3.00 DS
It is not split but -3.00 in each eye. The description is very clear, but I would still call because it should not be used with prism. This also holds true with the degree symbol as it can be confused with a "0" making an axis of 18 into and axis of 180 so it is wrong to use degree symbols when writing out a prescription. I find it necessary to slash my 7's as well so that their is no confusion in the matter. A recipe is best when easily interpreted, even pharmacists are moving away from the common acronyms for frequency of dosage to a more clear direction.
Warren,
It can be misinterpreted by those who don't understand prescribed prism, as well as by those who do.
WRT yoked prism Rxs- I've filled two, in recent years, one from a behavioral/developmental optometrist, and one from a neuro-ophthalmologist. We don't see it "often", and is not "far-fetched", although its use in developmental optometry is probably not mainstream. It's effectiveness is certainly not "zero", especially for TBI.
Best regards,
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.
Pardon my ignorance-
LCA?
Vertical yoked prism prescription have the potential to reorder and reorient visual function by simultaneously affecting visual motor and visual sensory processes.
The term "yoked prism" was originally used to differentiate it from the typically prescribed lateral prism. They are defined as a pair of prism lenses of equal power with their prism base in the same direction. The utilization of these prism lenses are highly selective and specific.
Basic philosophy of Behavioral Optometry and the use of vertical prism prescription is that efficient acquisition and processing of visual information requires the development of a good representation of the 3-dimensional structure of body and environmental space and the ability to move attention freely within this space.
Can you imagine this sometimes happens even in Brooklyn!
I'm going with lateral chromatic aberration. I would have thought radial chromatic aberration though. Hmmm.
Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA
“As our circle of knowledge expands, so does the circumference of darkness surrounding it.” -Albert Einstein
Yes, Lateral chromatic aberration. It's more noticeable than ACA's (Axial chromatic aberration). My speculation is probably wrong though because LCA's are also very dependent of a lens materials Abbe's. More than likely Sheedy's studies used glass trial lenses. Darryl has an excellent CE on the subject here, ( and I hope he chimes in on the Sheedy study);
http://www.2020mag.com/ce/TTViewTest...essonId=107855
Hi Robert
Its prismatic effect, as we typically think of it is 0. We would typically see vertical prism in opposite directions. Yoked prism can be used for folks with speecific conditions, like TBI, as you aptly point out. But I am sorry, if someone does not understand OU, and considers it to mean base out, they have no business taking care of patients. But as Opticianry has disintegrated to what it is today, I am not surprised. The pictures may just be called for in this environment.
Best,
Warren
You know we're a bunch of nerds, right?
Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA
“As our circle of knowledge expands, so does the circumference of darkness surrounding it.” -Albert Einstein
The biggest nerds I've ever met on the interwebs.
Seen my avatar?
There was a long discussion about this, years ago: http://www.optiboard.com/forums/show...t=ocular+latin
I received an Rx recently that abbreviated OUT as OU. I'll try to find it. Here's how my software handles the abbreviations.
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.
DOS Robert?
Are we really going to be looking to Alpha Bytes as a guide to the appropriate way to something like this? Using "OU" as an abbreviation for "out" strikes me as a profoundly bad idea. I agree with the proposition stated earlier, that a polar expression is superior in just about every way.
Yup. Limping into the 21st century. If there was a comparable program, and if all of the data (16 years worth) could be converted...DOS Robert?
Can 'o' worms it is. I just wanted everyone to know it's out there. I'll call the doctor when I find the Rx that used this prism notation, but it was an OMD...
Agreed. It's should be universal.I agree with the proposition stated earlier, that a polar expression is superior in just about every way.
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.
Can I get a freaking amen?
"Strictly speaking, there are no enlightened beings; only enlightened activity." -Shunryu Suzuki
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