Hi all...
I have a job for a patient I'm questioning at work. Power is somewhere around a -4.50; I don't remember what the cyl power is.
The PD is off by about 5 mm. It should come in at 58 but it's measuring at about 63.
This would give at least a diopter of prism per eye, plus more depending on what the cyl power is.
The tolerance chart provided by my company is not very clear on whether the listed tolerances are binocular or monocular. But the chart says for anything over +/-2.75 the PD tolerance is 2.5mm. Is this total, or per lens? I don't know exactly, but it makes no sense to me to allow 5mm, so a total of 2.5mm seems more logical.
Bookmarks