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I've had my last several pairs from Zenni Optical - I think my multifocals cost me around $60 delivered. That's with hydrophobic/oleophobic and anti reflective coatings (and the 'extra strength' costs). Probably $400 locally. Optically, they seem fine (I've got bad astigmatism too). Zenni frames are certainly of lesser quality than I've seen at my local optometrist, but hey, for $40 - $60 a pair..... The oil resistant coatings are absolutely brilliant for ease of cleaning. I think the coating is getting less effective now, but that's 24/7 wear for a few years so no complaints there.
I have sanded down old lenses into circles to fit into eyepieces - it works but it's a bit of a hassle. These days, I just make sure I have eyepieces/binos with 17mm or more eye relief and keep my glasses on. Never noticed chromatic aberration with eyeglasses, but I think the anti reflection coatings are a must. The quality of the lens seems pretty good compared to the $300 plus I've paid locally in the past - coatings seem fine on the Zenni's too. Have no intention of ever paying $300 again for specs.
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