Is anyone aware of any studies on vertex distances measured at the phoropter?
I most often read 13 or 14. ODs I know personally reflexively say the 'average' is 12 or 12.5. In either case, I find that supremely unhelpful absent a measure of standard deviation, not to mention subsets by race and gender and perhaps even age. Most of the patients I end up measuring in the dispensary have two different monocular values.
Do docs have some study citation for this? Or is this just a hand-waving rumor that travels between them with far more confidence than it deserves?
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