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Poly is thinner, lighter, impact resistant, scratch resistant, and has UV protection "built in" to the lens.
Plastic is slightly thicker than Poly, and I usually recommend adding a scratch coat (like TD2 or Crizal Alize) to help extend the life of the lenses.
If you have a strong RX and want thin lenses, I would recommend going with a Hi-Index Plastic (1.60 or 1.67). It's still a type of plastic, and doesn't have all the great qualities of Poly but the Poly will distort your side vision and could cause you to feel cross-eyed or feel like your eyes are "pulling".
It's best not to switch back and fourth between the two materials because your eyes will have to re-adapt each time to the different material.
If you start in Poly and never had problems, stay with it for the rest of your "glasses wearing life" lol
Same goes for Plastic... don't switch to poly...
~Megan S.
Optician
Wiki User
∙ 14y ago
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