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ZenniOptical: $5 off $25, $10 off $50, or Expired
$15 off $70
+ $4.95 Shipping
ZenniOptical offers $5 Off $25+ Orders, $10 Off $50+ Orders, or $15 Off $70+ Orders when you apply promo code FSAHSA22 at checkout. Shipping is $4.95.
Note, promotion details may be found here.
Thanks to Community Member wsm for posting this deal.
Available:
Note, promotion details may be found here.
Thanks to Community Member wsm for posting this deal.
Available:
Original Post
Written by
Edited March 7, 2022
at 07:22 AM
Zenni Optical has up to $15 off with code FSAHSA22 until March 13th.
$5 off $25, $10 off $50, $15 off $70 orders
https://www.zennioptica
$5 off $25, $10 off $50, $15 off $70 orders
https://www.zennioptica
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Code: HPOWO15
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Or the simple way - ask if the shop sells Freeform lenses!
(Regular prescriptions not very accurate 0.25 diopter steps, so even looking left or right without turning your head will result in blurred vision. Think off-the-rack suit.
Freeform lenses are custom made to 0.01 diopter steps, so super accurate and sharp vision edge to edge. Think tailored suit.
For photographers, normal lenses = spherical, Freeform lenses = aspherical.)
Whether you care for a Freeform lens or not at $250+ depends on how picky you are about visual sharpness off-center. Some don't notice or care, some tilt their heads just a few degrees and notice every defect in normal lenses.
(One way to check. Look at a TV or calendar about 6 feet away. Something with text large and fine. Notice how sharp the text is. Now, while looking at the same text, turn your head slightly towards the right. Did you notice the text sharpness changing? Is that annoying to you?)
...
The lens material itself is pretty standardized.
CR39 at 1.50 to polycarbonate to Tivex to even higher index lenses.
Few companies are making custom lens plastics since the Freeform + anti-reflective coating alone is going to produce a far more noticeable gain in lens performance.
..
Keep in mind the ABBE value.
How much things go to crap when you look left or right through a lens without turning your head.
CR39 has the best ABBE value, and all higher index lenses are worse.
If your prescription is mild (eg +3.5 to -3.5), cr39 is thin and light + thin enough while giving you superb off-axis visual clarity...through a normal, non-Freeform lens. Using a very high index, lens material with such diopters in a non-freeform, regular lens will simply turn your off-center vision crappier.
At higher diopters, like a -8.00, you really want a Freeform, high-index lens to give you both great off-axis vision and light + thin weight.
Of course, freeform lenses at any diopter will perform better no matter what because of the 0.001 diopter accuracy.
..
For zenni, go with the lower index lens materials that give you a lens that's thin and light enough for you to live with but have better abbe values. Imo.