Hello! Indeed the difference in clarity between the 2 lens types is present and noticeable to some, however everyone's eyes function and adapt differently to certain lens materials. For example, some people might be 'non-adapt' to a specific lens material, including CR-39, and experience issues like fishbowl effect and/or unwanted distortion where they would otherwise see clearly in the lens type their eyes respond to best. There is also the consideration of where the lens blank is produced, the lab that is cutting the lens, and what the lens is to be used for. Tactical or sport glasses, for instance, can only be made with Trivex or Polycarbonate lenses because CR-39 does not meet impact and shatter resistance standards in accordance with OSHA. For more information reach out to our friendly and knowledgeable SportRx opticians!
I think you are missing a big feature of polycarb lenses. I see you mentioned that they are impact resistant, You should not be using anything but polycarb when you are driving or riding in a car. If you get in an accident and those Cr-39 lenses shatter (which they frequently do) you risk losing an eye or seriously damaging your vision. Why tempt fate?
Yeah, I hear what you're saying, but I wouldn't go so far as to say that you shouldn't wear CR-39 in the car because there could be an accident. That makes me think about how many sunglasses, prescription or non-prescription, have glass lenses. Glass is way more dangerous when considering shattering and there are many, many people out there wearing glass. Also, when CR-39 breaks, it doesn't really shatter in an 'explosive' manner. Certainly, polycarbonate is safer, but that doesn't make CR-39 a health concern when doing everyday activities. If you're in a high-intensity situation where you need eye protection, definitely skip the CR-39 (and glass!).
all you need is to look through them.
maybe you never had CR 39 lenses ? polycarbonate has color fringes because it is an inferior lense material.
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