i’m not convinced the humble eye blink is just to dampen the eyeballs, clean them etc.
isn’t there a bit more happening?
I mean you’re going from lights on to lights off. There’s something much more happening.
Here you go, this lot should keep you going for a while.
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC510520/pdf/brjopthal00688-0001.pdf&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggVMAg&client=internal-uds-cse&usg=AFQjCNGYDblGKfsqcJSPrbXZifQfEBefIg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824881/&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggPMAU&client=internal-uds-cse&usg=AFQjCNFcV7QUwNMcqLcPKchysazykdtDKA
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/9222228&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggXMAk&client=internal-uds-cse&usg=AFQjCNE1r0DWsGr22VJeprOiQ7hvIhcKbg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/8266635&sa=U&ved=0ahUKEwiV0a3bsOHUAhUEE7wKHY31Bek4ChAWCAswAw&client=internal-uds-cse&usg=AFQjCNE6Dc8TAfLS8rlwcHUGrtOUpUYXFw
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4849103/&sa=U&ved=0ahUKEwiOq_WVseHUAhVIabwKHR8ICFw4HhAWCBowCQ&client=internal-uds-cse&usg=AFQjCNEKycb9k3nWaZrEne6P8kcIPnC1Eg
buffy said:
Here you go, this lot should keep you going for a while.
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC510520/pdf/brjopthal00688-0001.pdf&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggVMAg&client=internal-uds-cse&usg=AFQjCNGYDblGKfsqcJSPrbXZifQfEBefIg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824881/&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggPMAU&client=internal-uds-cse&usg=AFQjCNFcV7QUwNMcqLcPKchysazykdtDKA
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/9222228&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggXMAk&client=internal-uds-cse&usg=AFQjCNE1r0DWsGr22VJeprOiQ7hvIhcKbg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/8266635&sa=U&ved=0ahUKEwiV0a3bsOHUAhUEE7wKHY31Bek4ChAWCAswAw&client=internal-uds-cse&usg=AFQjCNE6Dc8TAfLS8rlwcHUGrtOUpUYXFw
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4849103/&sa=U&ved=0ahUKEwiOq_WVseHUAhVIabwKHR8ICFw4HhAWCBowCQ&client=internal-uds-cse&usg=AFQjCNEKycb9k3nWaZrEne6P8kcIPnC1Eg
lol, no one reads links on the forum ;)
I dunno about that. I thought “Blink and you’ll miss it: the role of blinking in the perception of magic tricks” interesting.
poikilotherm said:
buffy said:Here you go, this lot should keep you going for a while.
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC510520/pdf/brjopthal00688-0001.pdf&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggVMAg&client=internal-uds-cse&usg=AFQjCNGYDblGKfsqcJSPrbXZifQfEBefIg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824881/&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggPMAU&client=internal-uds-cse&usg=AFQjCNFcV7QUwNMcqLcPKchysazykdtDKA
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/9222228&sa=U&ved=0ahUKEwidr7Dor-HUAhWFn5QKHSPKCbQQFggXMAk&client=internal-uds-cse&usg=AFQjCNE1r0DWsGr22VJeprOiQ7hvIhcKbg
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pubmed/8266635&sa=U&ved=0ahUKEwiV0a3bsOHUAhUEE7wKHY31Bek4ChAWCAswAw&client=internal-uds-cse&usg=AFQjCNE6Dc8TAfLS8rlwcHUGrtOUpUYXFw
https://www.google.com/url?q=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4849103/&sa=U&ved=0ahUKEwiOq_WVseHUAhVIabwKHR8ICFw4HhAWCBowCQ&client=internal-uds-cse&usg=AFQjCNEKycb9k3nWaZrEne6P8kcIPnC1Eg
lol, no one reads links on the forum ;)
No way I’m typing all that out.
I’ve been noticing lately that if I stare at something for long enough, the block colours vanish. It’s essentially like going blind. Blinking helps restore sight.
The vanishing of sight occurs through the superposition of image and afterimage.
It occurs because the retinal cells get tired of doing the same thing over and over again.
Perhaps we blink to give our brains time to process visual input
mollwollfumble said:
I’ve been noticing lately that if I stare at something for long enough, the block colours vanish. It’s essentially like going blind. Blinking helps restore sight.The vanishing of sight occurs through the superposition of image and afterimage.
It occurs because the retinal cells get tired of doing the same thing over and over again.
Once a rod or cone has fired off its message there is a refractory period before it can fire again. In normal vision you make micromovements to keep the image moving onto different receptors. When you stare, you halt the micro movements and you ‘see’ the refractory time.
Similar explanation for afterimages. You sort of over do the blue, so the after image is yellow.
Another eye related one.
I thought our pupils would be fully dilated when awaking in a dark room at night
Observation seems to show otherwise.
If I go outside on a moonless night the sky seems starless. After a short while more & more stars become visible.
Would this be because my pupils are dilating?
Tamb said:
Another eye related one.
I thought our pupils would be fully dilated when awaking in a dark room at night
Observation seems to show otherwise.
If I go outside on a moonless night the sky seems starless. After a short while more & more stars become visible.
Would this be because my pupils are dilating?
No, you are dark adapting. The first part is 7ish minutes, full adaptation takes around 20 minutes. It’s the retina turning over from cone to rod vision. Here is a piece written by a bloke I trained with:
http://webvision.med.utah.edu/book/part-viii-gabac-receptors/light-and-dark-adaptation/
buffy said:
Tamb said:
Another eye related one.
I thought our pupils would be fully dilated when awaking in a dark room at night
Observation seems to show otherwise.
If I go outside on a moonless night the sky seems starless. After a short while more & more stars become visible.
Would this be because my pupils are dilating?
No, you are dark adapting. The first part is 7ish minutes, full adaptation takes around 20 minutes. It’s the retina turning over from cone to rod vision. Here is a piece written by a bloke I trained with:
http://webvision.med.utah.edu/book/part-viii-gabac-receptors/light-and-dark-adaptation/
Wow! That is one spectacular piece of research.
Only bit I’m not sure about is that if I’ve been in the dark for several hours (asleep) with no light other than starlight wouldn’t I already be dark adapted?
Tamb said:
buffy said:
Tamb said:
Another eye related one.
I thought our pupils would be fully dilated when awaking in a dark room at night
Observation seems to show otherwise.
If I go outside on a moonless night the sky seems starless. After a short while more & more stars become visible.
Would this be because my pupils are dilating?
No, you are dark adapting. The first part is 7ish minutes, full adaptation takes around 20 minutes. It’s the retina turning over from cone to rod vision. Here is a piece written by a bloke I trained with:
http://webvision.med.utah.edu/book/part-viii-gabac-receptors/light-and-dark-adaptation/
Wow! That is one spectacular piece of research.
Only bit I’m not sure about is that if I’ve been in the dark for several hours (asleep) with no light other than starlight wouldn’t I already be dark adapted?
You would be past the first fast bit. Probably. Daylight vision is called photopic. In between, when both rods and cones are working is mesopic (like dusk). Dark vision is scotopic. You could search more if you want. But if you were asleep, woke, didn’t turn any lights on and went outside, you would be partway along the curve. But as soon as you turn a light on, or even look at a doorway with light, you start all over again.
buffy said:
Tamb said:
buffy said:No, you are dark adapting. The first part is 7ish minutes, full adaptation takes around 20 minutes. It’s the retina turning over from cone to rod vision. Here is a piece written by a bloke I trained with:
http://webvision.med.utah.edu/book/part-viii-gabac-receptors/light-and-dark-adaptation/
Wow! That is one spectacular piece of research.
Only bit I’m not sure about is that if I’ve been in the dark for several hours (asleep) with no light other than starlight wouldn’t I already be dark adapted?
You would be past the first fast bit. Probably. Daylight vision is called photopic. In between, when both rods and cones are working is mesopic (like dusk). Dark vision is scotopic. You could search more if you want. But if you were asleep, woke, didn’t turn any lights on and went outside, you would be partway along the curve. But as soon as you turn a light on, or even look at a doorway with light, you start all over again.
At my age getting up in the night is compulsory. The only light is the microwave clock in the kitchen so maybe there is some indirect reflected green light from it.
I’ll turn it off tonight so there is no artificial light in the house & report back on it tomorrow.
The idea of being part way along the curve makes sense.
Would starlight count as reset light?
No, not bright enough. I can’t now remember what the reset brightness is. Does it say in Michael’s paper?
buffy said:
No, not bright enough. I can’t now remember what the reset brightness is. Does it say in Michael’s paper?
How much time does one spend blinking?
If you added up all the time in one day when the eye blinks, how much time is open and how much time is closed?
Searches.
A blink lasts for about 0.3 to 0.4 seconds. It is said that we blink about five times a minute, every minute, for about 18 hours a day. This adds up to 30 minutes a day and about 5 years in a lifetime. So we spend five years of our life with our eyes shut from blinking.
I’m sure I blink more than 5 times a minute.
Tau.Neutrino said:
How much time does one spend blinking?If you added up all the time in one day when the eye blinks, how much time is open and how much time is closed?
Searches.
A blink lasts for about 0.3 to 0.4 seconds. It is said that we blink about five times a minute, every minute, for about 18 hours a day. This adds up to 30 minutes a day and about 5 years in a lifetime. So we spend five years of our life with our eyes shut from blinking.
I’m sure I blink more than 5 times a minute.
There’s lots of tricks in blinks.
You know like if you turn your head 30degrees quickly you can blink and save yourself the blur and attempt at extra processing between. Long enough too and the persistence (both in the eye, and of processing) from the previous image can extinguish some.
But something else happens. You got imagine processing, you blink, then there’s a mental state change (some configuration changes).
Nah I think there’s something special about blinks.
furious said:
- Nah I think there’s something special about blinks.
http://i60.tinypic.com/2j6252t.gif
that too