August 10, 2008 6:44 PM Subscribe
What is wrong with my nauseating (but clear) glasses which do not preserve shape throughout the field of vision?
posted by gensubuser to health & fitness (11 answers total)
I bought a new pair of glasses online, and love the savings and the looks, but am having trouble adjusting to the new prescription, I think. It is the first time with astigmatic correction, maybe, but there are couple other things that I was mulling over as the possible cause. The nauseating part is tracking an object as I turn my head--it distorts and skews differently depending on where it is in my field of vision (though it is pretty much always in focus). In particular, towards the top things shrink vertically, the top left skews ccw, the top right skews clockwise (it's tough to tell about the bottom).
My new optometrist "forgot" to write down the Pupillary Distance measurement on the prescription, and I was disgusted enough with their salesmanship that I ended up calling my old Lenscrafters to see what was used there (it was within the Net's typical range). But actually, I seem to remember the same thing happening with my last pair, though it that case it was free to have the lenses remade. They came out thicker (about as thick as now, actually), but non-distorting. They definitely remeasured my PD at that point, but may have adjusted the new glasses slightly in person.
I've now read about the "prism effect" which I assume to be produced by a wrong PD measurement. Since I'm tied to the online shop for half-price remakes, is it more likely that:
a) the lenses are somehow inferiorily made in their edge territories, and I should break down and buy local.
b) the PD is wrong, I should be assertive and get a PD measurement from the new doc [or, I should have them measured for accuracy there]
c) the new cylindrical measurement, though unblurifying, is distorting in a way that isn't true to my eye at large angles?
Or... something else?