I know I've asked this question before, but I don't think I got an answer.
The "vertex distance" we're asking ECP's to take is what I've always known as the "fitting distance". Vertex distance was the measurement that a prescriber noted as the distance from the front surface of the cornea to the phoroptor. The compensated power was determined by the difference between the two.
So, of what actual use is the "vertex distance" we're now asking ECP's to provide when ordering "individualized" PAL's?
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