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I have prescription eyeglasses with -1.5D power (Myopia). I have been wearing eyeglasses for past 5 years and recently changed to blue light filter ones. Now I recognise everything red in colour as a bit projected than blue colours. Especially in all these anaglyph images like:

enter image description here

enter image description here

and even with non-anaglyph photos like:

enter image description here.

In Videos with Intros in Black and Red, I see Red in 3D. I would be really glad to know what might be the reason? Is it that the blue light filter blocks blue light and red is projected like a half 3D (red-blue) glass? I tried showing the same images with my glass to my parents and siblings and they were also amazed to see it in 3D!

PS: I see things normally with my non-coated eyewear.

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  • $\begingroup$ Wow! Just confirmed this. Welcome to the Physics stack exchange, btw! $\endgroup$
    – AlphaLife
    Apr 30, 2021 at 15:56
  • $\begingroup$ I’m voting to close this question because it seems to be about the human perceptual apparatus, which isn’t really physics. $\endgroup$
    – rob
    Apr 30, 2021 at 16:12
  • $\begingroup$ Hi @rob Can I know why the human perceptual apparatus isn't really physics? Where should I ask this doubt then? $\endgroup$ Apr 30, 2021 at 16:48
  • $\begingroup$ @rob It seems like a question about the optics of the filtered lenses, not a question about the eye. I think this could be on topic, although answering it probably involves knowing some engineering details about how these specific lenses work. $\endgroup$
    – d_b
    Apr 30, 2021 at 16:51
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    $\begingroup$ I vote to reopen because the reason is probably that the focal point of the red light is different from that of the blue, because the lenses exhibit a nontrivial amount of dispersion. This is a common problem with cheap plastic eyeglass lenses, and to avoid it you must specify low-dispersion lens material. $\endgroup$ Apr 30, 2021 at 17:42

1 Answer 1

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The reason is probably that the focal point of the red light is different from that of the blue, because the lenses exhibit a nontrivial amount of dispersion. This is a common problem with cheap plastic eyeglass lenses, and to avoid it you must specify low-dispersion lens material.

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