4 ms·

With blurry data, there's not much you can do. The adaption is about to change both the pupil's size (constricting it, like in a pinhole camera) and the lens' s

With blurry data, there's not much you can do. The adaption is about to change both the pupil's size (constricting it, like in a pinhole camera) and the lens' shape. I've tried to learn how to do this myself with very limited success. If I try to force my eyes to become blurry and then unblurry, I can notice some improvement in my ability to resolve images underwater. But this probably takes a lot of practice, and my lens is already starting to harden with age.

Ididntdothis 7y ago
The question is whether your input is really blurry or the brain just doesn’t decode it right. A few months ago I remember reading about a method to improve eyesight by looking at things and retraining the brain. I don’t remember the details but it really worked for the author. The only problem was it was extremely boring, tedious and consumed several hours a day. But it worked. Wish I could find that article again.
- Fr0styMatt88 7y ago
  There’s some really interesting stuff around this, once you start digging. I’m aphakic in both eyes (no lenses; they were removed as cataracts when I was a kid) and was blind as a child through some of the critical period of vision development. That left me having what I think can be described as bilateral amblyopia - essentially two ‘lazy eyes’, though that’s not really a good description in the sense that ‘lazy eye’ seems to be commonly misunderstood. So the weird thing is that both my eyes have a visual acuity around 20/120 or worse; that’s with correction (glasses) and it depends on the day (tiredness/dryness/etc) — but having lived this way my entire life essentially, I find it REALLY difficult to describe what it’s like to people. People think things off in the distance must be ‘blurry’, but that’s not the case at all. It’s more like ‘less detailed’, like if you turn the resolution and texture detail down. It’s not like an unfocused lens at all. There are studies I’ve found that seem to back this up. Another problem I have that’s related is a nystagmus - both my eyes oscillate involuntarily from side-to-side, separate from the normal saccades (rapid eye movements) that everyone has. You’d think I’d see the whole world oscillating from side to side - but I don’t at all. I don’t usually even notice these movements when I look in the mirror, though I can see them if I’m looking at a video of my own face. That is, most of the time. There’s one really strange failure mode I’ve observed - PWM-controlled small LED lights or segment displays like on a digital clock, particularly if they’re red but green as well, in a dark room. If it’s dim enough that I can still dimly see what surrounds the display, I can sometimes notice the LED oscillating left and right, WHILE THE STUFF SURROUNDING IT STAYS STILL. It’s really freaking weird! in short: the eye and brain are complicated!
  - jimbo1qaz 7y ago
    I have perfectly normal vision (no nystagmus that I know of), and still notice PWM LED displays moving relative to the surrounding microwave, when my eyes move around.
  - Stratoscope 7y ago
    I often see something like that when I'm driving and stop behind a car that has LED tail and brake lights including an LED brake light above the rear window. If I look at the car's rear trunk lid and hold my eyes still for a few seconds, the raised brake light starts moving up! (Or down, I don't remember which direction right now, but I think it's always the same direction.) And it's not like everything in my vision is moving with it, that one raised light is moving all by itself. And it keeps moving and moving in the same direction, but somehow stays in the same place. It's a strange experience, almost like a Shepard Tone of vision. https://www.google.com/search?q=shepard+tone https://www.google.com/search?q=shepard+tone
- jefftk 7y ago
  Are you thinking of Susan Barry's "Fixing My Gaze"?
flukus 7y ago
> With blurry data, there's not much you can do. The brain does an awful lot with blurry and outright missing data. Look at something in your peripheral vision and name the colour of it, that's the brain filing in information that your eyes can't see. We only have good eyesight in a surprisingly small region directly in front of us. > The dividing line between near and mid peripheral vision at 30° radius is based on several features of visual performance. Visual acuity declines by about 50% every 2.5° from the center up to 30°, at which point visual acuity declines more steeply.[18] Color perception is strong at 20° but weak at 40°.[19] 30° is thus taken as the dividing line between adequate and poor color perception. In dark-adapted vision, light sensitivity corresponds to rod density, which peaks just at 18°. From 18° towards the center, rod density declines rapidly. From 18° away from the center, rod density declines more gradually, in a curve with distinct inflection points resulting in two humps. The outer edge of the second hump is at about 30°, and corresponds to the outer edge of good night vision. - https://en.wikipedia.org/wiki/Peripheral_vision https://en.wikipedia.org/wiki/Peripheral_vision
m463 7y ago
I'm nearsighted, but as a kid I had an enormous range of focus with my eyes. I could rest my finger at the end of my nose and clearly see the whorls in my fingerprint. I could feel the muscles in the front of my eye contracting when I did this. That went away over time, even as my prescription became much more nearsighted (I'm almost 9 diopters now)
- pnutjam 7y ago
  I'm as nearsighted. I can still focus up close, without any corrective lenses. I'm 41. I do have less near focus with corrective lenses.

Ididntdothis 7y ago

The question is whether your input is really blurry or the brain just doesn’t decode it right. A few months ago I remember reading about a method to improve eyesight by looking at things and retraining the brain. I don’t remember the details but it really worked for the author. The only problem was it was extremely boring, tedious and consumed several hours a day. But it worked. Wish I could find that article again.

Fr0styMatt88 7y ago
There’s some really interesting stuff around this, once you start digging. I’m aphakic in both eyes (no lenses; they were removed as cataracts when I was a kid) and was blind as a child through some of the critical period of vision development. That left me having what I think can be described as bilateral amblyopia - essentially two ‘lazy eyes’, though that’s not really a good description in the sense that ‘lazy eye’ seems to be commonly misunderstood. So the weird thing is that both my eyes have a visual acuity around 20/120 or worse; that’s with correction (glasses) and it depends on the day (tiredness/dryness/etc) — but having lived this way my entire life essentially, I find it REALLY difficult to describe what it’s like to people. People think things off in the distance must be ‘blurry’, but that’s not the case at all. It’s more like ‘less detailed’, like if you turn the resolution and texture detail down. It’s not like an unfocused lens at all. There are studies I’ve found that seem to back this up. Another problem I have that’s related is a nystagmus - both my eyes oscillate involuntarily from side-to-side, separate from the normal saccades (rapid eye movements) that everyone has. You’d think I’d see the whole world oscillating from side to side - but I don’t at all. I don’t usually even notice these movements when I look in the mirror, though I can see them if I’m looking at a video of my own face. That is, most of the time. There’s one really strange failure mode I’ve observed - PWM-controlled small LED lights or segment displays like on a digital clock, particularly if they’re red but green as well, in a dark room. If it’s dim enough that I can still dimly see what surrounds the display, I can sometimes notice the LED oscillating left and right, WHILE THE STUFF SURROUNDING IT STAYS STILL. It’s really freaking weird! in short: the eye and brain are complicated!
- jimbo1qaz 7y ago
  I have perfectly normal vision (no nystagmus that I know of), and still notice PWM LED displays moving relative to the surrounding microwave, when my eyes move around.
- Stratoscope 7y ago
  I often see something like that when I'm driving and stop behind a car that has LED tail and brake lights including an LED brake light above the rear window. If I look at the car's rear trunk lid and hold my eyes still for a few seconds, the raised brake light starts moving up! (Or down, I don't remember which direction right now, but I think it's always the same direction.) And it's not like everything in my vision is moving with it, that one raised light is moving all by itself. And it keeps moving and moving in the same direction, but somehow stays in the same place. It's a strange experience, almost like a Shepard Tone of vision. https://www.google.com/search?q=shepard+tone https://www.google.com/search?q=shepard+tone
jefftk 7y ago
Are you thinking of Susan Barry's "Fixing My Gaze"?

flukus 7y ago

> With blurry data, there's not much you can do. The brain does an awful lot with blurry and outright missing data. Look at something in your peripheral vision and name the colour of it, that's the brain filing in information that your eyes can't see. We only have good eyesight in a surprisingly small region directly in front of us. > The dividing line between near and mid peripheral vision at 30° radius is based on several features of visual performance. Visual acuity declines by about 50% every 2.5° from the center up to 30°, at which point visual acuity declines more steeply.[18] Color perception is strong at 20° but weak at 40°.[19] 30° is thus taken as the dividing line between adequate and poor color perception. In dark-adapted vision, light sensitivity corresponds to rod density, which peaks just at 18°. From 18° towards the center, rod density declines rapidly. From 18° away from the center, rod density declines more gradually, in a curve with distinct inflection points resulting in two humps. The outer edge of the second hump is at about 30°, and corresponds to the outer edge of good night vision. - https://en.wikipedia.org/wiki/Peripheral_vision https://en.wikipedia.org/wiki/Peripheral_vision

m463 7y ago

I'm nearsighted, but as a kid I had an enormous range of focus with my eyes. I could rest my finger at the end of my nose and clearly see the whorls in my fingerprint. I could feel the muscles in the front of my eye contracting when I did this. That went away over time, even as my prescription became much more nearsighted (I'm almost 9 diopters now)

pnutjam 7y ago
I'm as nearsighted. I can still focus up close, without any corrective lenses. I'm 41. I do have less near focus with corrective lenses.