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(Slate)   Myopia increasing everywhere, not just in Congress   (slate.com) divider line 13
    More: Interesting, systematic review, native people, cataracts, educational attainment, Singaporean  
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1584 clicks; posted to Geek » on 17 Oct 2013 at 12:32 PM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



13 Comments   (+0 »)
   
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2013-10-17 12:54:16 PM  
Glasses and contacts have been a nuisance, but I've finally reached the age where myopia is adaptive. I can still hold something in my hands and take a close look at it without glasses, where most people my age need reading glasses.

/still hoping for that effective presbyopia treatment
//MIGHT consider elective eye surgery at that point
 
2013-10-17 01:00:03 PM  
Or, as is obvious to the casual reader, there is a complex enzymatic control system in the eye for long term correction of focus. It regulates the length of the eyeball, and is controlled by the rods in the periphery of the retina.

Bright sunlight suppresses the production of the enzyme that triggers eye lengthening. In addition, the retina periphery can detect whether the focal plane is falling in front of or behind the retina. If, over a long period of time, the peripheral focal plane falls in front of the retina, the enzyme is suppressed, shortening the eyeball to bring the entire retina in focus, not just the macula area. Constant focusing on near objects also moves the peripheral focal plane behind the retina, triggering a long term correction that induces myopia.

Corrective lenses can be designed two ways - to focus tangent to the macula and in front of the periphery, or tangent to the macula and behind the periphery. They're always ground to focus behind the periphery. This triggers the long term correction system to lengthen the eyeball to bring the periphery into focus as well. This makes the eye more near-sighted. So you get a stronger corrective lens, the focus again moves behind the retina, more lengthening. Thus do you get progressive myopia.
 
2013-10-17 01:07:05 PM  

jfarkinB: Glasses and contacts have been a nuisance, but I've finally reached the age where myopia is adaptive. I can still hold something in my hands and take a close look at it without glasses, where most people my age need reading glasses.

/still hoping for that effective presbyopia treatment
//MIGHT consider elective eye surgery at that point


CSIRO has your answer. I believe they're in testing now, the current torch holder on the accommodating gel project is Brien Holden Institute, IIRC.
 
2013-10-17 01:29:47 PM  
Maybe the kids are just getting smarter. Myopia is one of the few things which correlated significantly with intelligence.

The more time you spend outdoors being a jock or tom boy, the dumber you are.

But It would be nice to be able to adjust the focal length. Some cranks claim you can do exactly that, but there's little evidence to support the claim.

I am astygmatic. At night I can take my glasses off and the street lamps look like fat little Christmas trees because of the pattern of light and dark created by distortion. They are sort of shaped like beehives.

I have reached an age where I sometimes take my glasses off to read because it's easier to hold a book or  reader in front of my face than live with the smudges and glare.

I also have vestigial veins in my eyes. Only 5% of the population has this trait. They remind me that evolution is our friend and that my eyesight could always be worse.

Who was the idiot who designed the human eye, any way? He put blood vessels over the retina, and made the retina prone to detaching, and all this only a couple days of designing the eyes for the octopus and squid, which lack these defects?

Was he getting senile in his old age or what? Why would Providence do this? If we're God's favourite species, why do squids and octopuses get better eyes? And they can squeeze through a hole the size of a quarter. No fair.

All in all, I have lousy eyes, but I have beautiful long thick eyelashes that are to die for. At least women used to say that before I got glasses.
 
2013-10-17 01:45:36 PM  
I bet global warming is to blame.
 
2013-10-17 01:55:55 PM  
Damn that Afghan poppy trade!
 
2013-10-17 04:24:50 PM  
Play outside, problem solved.
 
2013-10-17 09:52:11 PM  

erewhon: Or, as is obvious to the casual reader, there is a complex enzymatic control system in the eye for long term correction of focus. It regulates the length of the eyeball, and is controlled by the rods in the periphery of the retina.

Bright sunlight suppresses the production of the enzyme that triggers eye lengthening. In addition, the retina periphery can detect whether the focal plane is falling in front of or behind the retina. If, over a long period of time, the peripheral focal plane falls in front of the retina, the enzyme is suppressed, shortening the eyeball to bring the entire retina in focus, not just the macula area. Constant focusing on near objects also moves the peripheral focal plane behind the retina, triggering a long term correction that induces myopia.

Corrective lenses can be designed two ways - to focus tangent to the macula and in front of the periphery, or tangent to the macula and behind the periphery. They're always ground to focus behind the periphery. This triggers the long term correction system to lengthen the eyeball to bring the periphery into focus as well. This makes the eye more near-sighted. So you get a stronger corrective lens, the focus again moves behind the retina, more lengthening. Thus do you get progressive myopia.


Mmm, yes.  Obvious.
 
2013-10-17 10:26:18 PM  
It always makes me shudder to imagine what people will look like in a few hundred years. Fatter, more nearsighted, and maybe taller. We're using unnatural selection to breed ourselves into big, fat, blind landwhales.
 
2013-10-18 06:01:57 AM  
fark you assholes questioning God's perfect plan.

/farking floaties
 
2013-10-18 01:05:57 PM  
It's sad how people think myopia is something natural, along with obesity and other health problems that are on the rise these days.  And nobody does anything about it in terms of prevention.  My parents generation is from a developing country, they had little education or electricity, ie didn't spend their days watching teevee and reading schoolbooks, not a single one of them has bad eyesight (well, until they got old).  My siblings and I who were born in raised in America: BAM, every single one of us has terrible myopia.  Humans are like the proverbial frog in the pot that doesn't realize the water is on the stove until its too late and they die.
 
2013-10-18 02:07:49 PM  

Dion Fortune: It's sad how people think myopia is something natural, along with obesity and other health problems that are on the rise these days.  And nobody does anything about it in terms of prevention.  My parents generation is from a developing country, they had little education or electricity, ie didn't spend their days watching teevee and reading schoolbooks, not a single one of them has bad eyesight (well, until they got old).  My siblings and I who were born in raised in America: BAM, every single one of us has terrible myopia.  Humans are like the proverbial frog in the pot that doesn't realize the water is on the stove until its too late and they die.


It's the price we pay for literacy.
 
2013-10-18 10:49:43 PM  

Fano: It's the price we pay for literacy.


Fair trade. If someone went back to three-year-old jfarkinB and told him "hold off reading for another few years, and spend a lot less time at it, and you won't need glasses", I'd like to think he would've already been wise enough to ignore them.
 
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