Blind and Visually Impaired Community
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Just out of curiosity, can you guys clearly distinguish day and night without you sights? (self.Blind)
submitted by Cautious-Lunch
Can the biological clock of the visually impaired(mainly guys with total blindness) normally operate?
DrillInstructorJan 3 points 3y ago
I'm blind enough that I can't tell day from night by light, except if it's sunny enough to feel the heat or whatever and you have to concentrate on it to even do that. There are other cues that it's night, temperature and noise. I have not had any serious circadian rhythm problems, at least not after the first few months when you're a basket case mentally anyway and it could have been that.
Possibly this is also because I usually work enough that I am happy to go to sleep at any available time but really can't until it's the right time to do so, and I generally get up when the alarm goes off. So I don't really have a lot of choice but to have fairly normal sleep patterns, or even rather short sleep patterns, life isn't that easy!
Also not to seem too terribly woke but I'm not a guy.
Possibly this is also because I usually work enough that I am happy to go to sleep at any available time but really can't until it's the right time to do so, and I generally get up when the alarm goes off. So I don't really have a lot of choice but to have fairly normal sleep patterns, or even rather short sleep patterns, life isn't that easy!
Also not to seem too terribly woke but I'm not a guy.
modulus 3 points 3y ago
I can't, at all. Usually I have a sense of time, but I can't tell whether it's night or day (so I don't know when the sun sets or rises, etc).
BodachanS 3 points 3y ago
there are biological light sensors that don't rely on vision. This is what tells blind people to sleep at night and wake up in the morning. Not something you'd notice but the body and brain take care of that part of it.
Cowener 3 points 3y ago
What does really control your day and night rhythm is the endogenous circadianrhythm which is high frequency light triggered via melatonin secretion from the pineal cortex and partly in the retina as well. High light frequency which is 4000-6000 kelvin triggers depression of melatonin secretion equal to daylight and lower frequency light triggers melatonin secretion.
Here's a short video on the subject:$1
Here's a short video on the subject:$1
BodachanS 2 points 3y ago
I'm not entirely sure what part of the eye/surrounding area is called and it may just be that blind eyes can pick up a small amount of light even though they don't allow vision they still pick up light and this helps tell the biological clock what time it. Without any sense of light or dark the bodies circadian rhythm.
There was a study where someone lived several weeks in conditions with no light and his circadian rhythm altered so he slept longer and was awake longer than 8 asleep 16 awake. The circadian rhythm and the body clock relies on light but the body can still pick up on it even without vision.
There was a study where someone lived several weeks in conditions with no light and his circadian rhythm altered so he slept longer and was awake longer than 8 asleep 16 awake. The circadian rhythm and the body clock relies on light but the body can still pick up on it even without vision.
CloudyBeep 1 points 3y ago
Google non-24 Sleep/Wake Disorder.
322lancer 1 points 3y ago
Not all the time. It's common among those who are completely blind to struggle with Non-24 Sleep Wake Disorder, where the body can't distinguish between night and day and their sleep patterns are thrown.
Greatwhitesharkbait 1 points 3y ago
There’s a disorder I have read about that happens when people who can’t sense light also can’t sense time of day or night. So it can definitely be and cause problems. Some totally blind people deal with sleep disturbances because their internal clock isn’t telling them it’s time for sleep.
stormsong19 1 points 3y ago
That is typically called non 24 sleep disorder and it is very much a real thing.
SWaspMale 1 points 3y ago
Definitely. I am more 'low vision' than completely blind, and I think most are.
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