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Bug-eyed glasses

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It's reasonably well known (or will be, when you've finished reading this sentence) that the human brain can adapt to an inverted visual field. People fitted with inverting glasses are initially inept and unable to perform vision-related tasks in what appears to be an upside-down world. But, after an adaptation period of a few days, the brain learns to flip the image, and the wearer sees the world normally again.

But what other miracles can the visual system perform? How plastic is the brain's visual cortex? Could it adapt to, say, a compound eye?

Compound eyes come in many types. In some cases, each facet registers only light intensity - a single "pixel". But in other types of compound eye, each facet is an image-forming eye in its own right. It's this second type of eye that is of interest here.

So, the experiment is to make eyeglasses which produce, on the retina, multiple small, identical images. Each image is just a shrunken version of the full visual field. Thus, each small part of the retina becomes a complete "eye", but with necessarily poor resolution. We might tile the retina with four, sixteen or a hundred small images in this way.

Initially, of course, the wearer would just see multiple low-res repeats of the scene before them. But, given time, would the brain adjust to this new format, and fuse the images into a single, high-resolution one?

One problem is that the human retina has greatest resolution only in a fairly small part of the retina (the fovea) - you normally only see a small part of the visual field in detail, and your brain creates the illusion of uniform detail. With MaxCo's "BugGlasses", the small image that hits the fovea will contribute most to the perceived scene. But, collectively, the peripheral images can contribute additional acuity.

An interesting corollary to this is that the whole visual field would be seen with the same resolution (since the whole field would be imaged by the fovea, but also by all the peripheral parts of the retina). Your peripheral vision would be as acute (or as non-acute) as your central vision.

It might even be possible to make these glasses useful. For instance, if some of the glasses' facets were polarized, you would (if your brain fused the images successfully) be able to perceive polarisation as an overlay on an otherwise normal visual field.

MaxwellBuchanan, Jan 29 2017

A dramatic cloudscape in HDR https://flic.kr/p/RkbCx
An example of HDR wot I did a long time ago. [Ian Tindale, Jan 30 2017]

[link]






       Feed a negative color view of the back of the user's head as a half-transparent overlay and see whether he can adapt to a 114+114 degree field of view. Or fish-eye for 360 degrees.
Voice, Jan 29 2017
  

       Dammit! I pictured it fully and now my head hurts. I think I sprained something in there. Hopefully it's just a spasm.   

       You'd lose all distance vision... but be able to avoid getting swatted like nobody's business.   

       //You'd lose all distance vision// Not necessarily. If each eye merges its multiple faceted images into a single image, it might recover some of the resolution lost through each image being smaller. If so, your brain would still have two images (left and right eye) available to it, and should still be able to extract parallax (depth) information from them.
MaxwellBuchanan, Jan 30 2017
  

       It should make almost no difference at all.   

       Ill-informed fiction films that portray the view of a fly or insect as being a wide cluster of vaguely hexagonal images are simplistically incorrect. Of course, in the single visual area of the insect, the group of visual feeds are integrated into one perceived 'scene'. The insect sees it as a single whole view and is likely totally unaware that they have compound eyes.   

       Think about it - we have two eyes - do we see things as two independent side-by-side views wedged together?   

       On a side note, I saw an interesting article on the pretty much 360° view that some species of hammerhead sharks are afforded because they combine the already increased wide view of their outset eyes with a side-to-side head motion as they swim. The brain puts it together as a single view. We find it hard to imagine what it must be like to have totally spherical viewing, but a fair few animals see things this way - birds that have eyes each side, for example. This might have ramifications with a new generation of VR eye apparatus. At the moment, they're transducing a select viewport (matching our eye view, roughly) from a wider 360°x180° sphere (or cube). If we could find a way of actually viewing this sphere as a whole, we wouldn't need the goggles, nor a selected cropped view propelled in direction by the phone or headset's motion and direction sensing.
Ian Tindale, Jan 30 2017
  

       //We find it hard to imagine what it must be like to have totally spherical viewing,// We do. In fact, what is quite strange is that "behind you" isn't dark, or black or grey or white - it's simply not there.
MaxwellBuchanan, Jan 30 2017
  

       Ah, that's not viewing, that's perception. Similarly, the entire hours between waking up and a midday cup of tea or coffee simply aren't there - it is as if we skipped past it.
Ian Tindale, Jan 30 2017
  

       Yes, but it's still strange.
MaxwellBuchanan, Jan 30 2017
  

       Only when you think about it.
Ian Tindale, Jan 30 2017
  

       //The insect sees it as a single whole view and is likely totally unaware that they have compound eyes.//   

       I wonder if they are aware they lack 2 balls of goo.   

       If we're remapping the retina I'd devote some to wider parts of the EM spectrum to detect e.g. IR or UV. We could then tell different sorts of grass apart and know directly whether to wear sunscreen.
bigsleep, Jan 30 2017
  

       Yes, but that would need glasses to convert IR or UV into visible light (and image it). Not impossible.
MaxwellBuchanan, Jan 30 2017
  

       //If we're remapping the retina I'd devote some to wider parts of the EM spectrum to detect e.g. IR or UV.//   

       Geordi's visor is WKTE   

       //We could then tell different sorts of grass apart and know directly whether to wear sunscreen//   

       Actually, our eyes are bloody useless at objectively working out how much light there is, even if we were sensitive to UV we'd still get sun burn. I frequently spend a long time looking at incredibly dim fluorescent things down a microscope. I can look at two cells and conclude that they're similar in brightness if they're separated by enough distance that my eye has to move. Pull up the same two cells on the EMCCD camera and there can easily be a tenfold difference. The trouble is your eye is constantly pulling tricks. Your iris will open and close, I'm also convinced that your eye dwells on brighter objects for less time, flicking to and from the object at a different rate than dim objects. I'm sure neuroscientiscts have it covered quite well, I may get 'round to reading it someday. Anyhow, light intensity varies enormously and all the physical and neuronal image processing keeps it within a narrow range, you'd only know if the UV were particularly high if you could see a reference alongside it, perhaps a door through to a previous day.
bs0u0155, Jan 30 2017
  

       That, [bs], is extremely true. Would you guess, for example, that the light levels on a sunny day at noon are about 100,000 times greater than the twilight immediately after sunset? Or 2,000 times brighter than a typical living room with the lights on, after dark?
MaxwellBuchanan, Jan 30 2017
  

       //Would you guess,//   

       Well, I would. Daylight is half a million fold brighter than moonlight. Or 48 million % in tabloid units.
bs0u0155, Jan 30 2017
  

       Ah yes. I was actually directing my question at [bigs]. And, for the record, you didn't guess, you knew.
MaxwellBuchanan, Jan 30 2017
  

       You'd certainly know about this having loaded up your camera with colour film (after first deciding which type of colour film to use - daylight or tungsten (or infrared) (which reminds me, I've still got a roll of infrared E6 in the fridge, must be a decade since I put it in there, already out of date when I bought it).). The chances of getting everything in a typical scene to look evenly exposed the way your eyes see it are very thin, aided nowadays by HDR, which is a technique for making every tone become closer to mid grey, so that it looks good.
Ian Tindale, Jan 30 2017
  

       //HDR, which is a technique for making every tone become closer to mid grey//   

       It's possible that I already have this installed in my retinas. Either that or I'm living in East Anglia.
MaxwellBuchanan, Jan 30 2017
  

       " So, the experiment is to make eyeglasses which produce, on the retina, multiple small, identical images."   

       Not to spoil the party, and not WKTE either, but I had a pair of those in the seventies. Don't know who made them, and the earpieces had been broken off, but they were good for laughs at parties.
normzone, Jan 30 2017
  

       Interesting... If you're ever back in the 70's, grab me a pair.
MaxwellBuchanan, Jan 30 2017
  

       It was just marginally tolerable the first time around, I try to avoid that decade whenever I have other options. I mean, the Led Zeppelin IV tour was awesome, but it was largely downhill from there.   

       These days I'm focused on being careful which timeline I'm in, what with President Rumsfeld's antics and all that nonsense.
normzone, Jan 30 2017
  

       I can make hours disappear just by drinking from my magic bottle.
Voice, Jan 30 2017
  
      
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