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I have read your post and observations about these various lenses... Would you prefer a summary answer to your question, or would you prefer more back-and-forth, where there will be a series of more questions and more details clarified? There is no difference in charges for your preference. You can continue to ask questions and receive answers without additional charges.
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To address your specific question first, The ventus glasses are certainly not necessary. There may be some use to them, but my strong hunch is that the effect they have derives from their polarization. This is not a unique feature of these lenses.
The recent fascination with blue-light and red-light has come up often, with the advent of the popularity of cell phones and people, perhaps like yourself, who spend a lot of time in front of screens. There is not yet enough research to support some of the wild fads of lenses, like the Ventus, or various apps that change lighting of images.
this is not to say that they are all complete hogwash. Our eyes are made up of receptors which are able to signal when they receive certain wavelengths of light. It seems reasonable to suggest, then, that these cones, as they're called, could become fatigued or irritated, and could cause headache or vision changes, albeit on a subtle scale.
Again, these concerns are all theoretical, at this point, without reproducible data that consistently shows X leads to Y. It is certainly possible that there are damaging effects of too much screen time. We know this to be true, but we are not at a stage of knowledge where we can say that "too much blue light" or "red light" is a problem, and then, as a solution, a pair of lenses would fix that.
have you tried wearing polarized lenses from time to time? Have you thought about having your eyes retested?
Was I able to address your question to your satisfaction? Can I clarify, or address any other related questions for you today?
There are no specific reasons to prefer one type of polarization over another. There are certainly differences in lens quality as far as production goes, and there are some additive layers that lensmakers can add to help protect against various UV radiation. Those are not simply for show, and do help protect the eye. Regarding your 2nd follow up question, it is very unlikely that the eye will self-correct without surgery or lenses. There are myths that wearing glasses makes the eyes weaker (not true at all,) but it's nearly impossible for eyes to self-correct once they become imperfect.
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