Pretty funny! But the reason so many people need glasses is because we spend all our time indoors, reading. People in the past were outside working all the time and they didn’t need glasses as a result.

[–] pumpkinseedoil@feddit.de 11 points 7 months ago (1 children)

I was born with bad eyes. People back then also were born with bad eyes but couldn't do anything about it.

Obviously you can also get bad eyes (shortsighted) when always only focusing on short distances but it's not the only way. Most people also become far sighted when they get older (the pressure inside your eye lowers and therefore your eye becomes shorter)

[–] SadSadSatellite@lemmy.dbzer0.com 15 points 7 months ago (1 children)

Focusing close regularly doesn't make you short sighted, not getting enough tourquoise light on your retina from staying inside makes your eye keep getting longer instead of stopping when the focal point is correct. Well, that and genetics.

And losing the ability to see near as you age has nothong to do with pressure. Your lens is constantly adding new layers to itself to stay clear, and after 40 it's become so thick the muscles that pull it to accommodate near vision can't stretch it enough. By 58 it doesn't stretch at all any more. That's why everyone eventually needs bifocals/progressives.

Don't state things as fact if your not sure of them.

Source: ABOA, NCLE, OD, I own two optical practices.

[–] olutukko@lemmy.world 4 points 7 months ago (1 children)

My biggest pet peeve in internet is people who state something as a fact eve though they are just really confidently wrong

[–] SadSadSatellite@lemmy.dbzer0.com 4 points 7 months ago (1 children)

My industry is full of pseudoscience and liars. I can't fault them for not knowing, and probably came off as more harsh than i intended.

I correct patients all day, and got pretty burned in the long long ago on reddit by people who "know better" patting themselves on the back and getting my factual information downvoted to oblivion.

[–] olutukko@lemmy.world 1 points 7 months ago

I feel you. The internet experts are always to confident with information they have literally never fact checked. It's just based on something they head and assumptions.

Of course everyone falls on that sometimes because we can't possibly filter every single piece of information we get.

But some people start arguing back when they are corrected instead of just going to read about the subject to see which one is true and that is just so dumb

[–] Tar_alcaran@sh.itjust.works 6 points 7 months ago (5 children)

Is that true? I feel like it simply wasn't an option, so people didn't get them.

[–] stinerman@midwest.social 5 points 7 months ago

My understanding is that being nearsighted is a relatively new phenomenon that is largely due to being indoors a lot. Farsightedness in old age has been around since humans have been humans.

I took a quick look and Wikipedia partially bears this out re: nearsightedness.

[–] ekky@sopuli.xyz 2 points 7 months ago* (last edited 7 months ago)

I think its a bit of both.

Personally, I apparently focus (that's what it's called, right? Non native speaker here) slightly behind infinity, so I'll have to put a slight amount of effort into seeing clouds clearly. I can also focus on close objects, but if I read a book for about 5-60 minutes without my glasses I'll suffer a splitting headache, depending on how much time I've used inside recently.

I've found that I can do office work just fine using glasses, but after a few months I'll need to get stronger glasses as my eyes become worse. This resets if I spend a few days outside avoiding computers, books, and my glasses entirely.

I can usually watch TV just fine without glasses, but if I've been doing office work or just been mostly inside for about 2-3 months I'll need my computer glasses (tuned to focus at around 50-100cm) to watch the TV (located about 3 meters away). At this point, I usually also have to use my reading glasses for the computer, and I've got a special pair of glasses that I can use for reading in that specific case. I even start having problems driving longer routes.

In other words, I have ~~really~~ rather (I can still most tasks, just with a headache) bad eyesight during winter and spring, but usually have much better eyesight and barely need glasses during summer and fall.

[–] Perfide@reddthat.com 1 points 7 months ago

There is some truth to it, but there's also just the fact that some people's eyes are bad enough that they need glasses to fully function in modern society, but not so bad that they couldn't survive in the wild without them.

Me for example. I need glasses to drive, I can't read street signs otherwise, and I need them at work, but I otherwise usually don't wear them. The only thing better eyesight would meaningfully help me with in the wild is navigation and spotting hidden animals quicker, and even then it'd really only help with snakes. Any other ambush predator I'd be likely to encounter in my region is big enough that spotting it a few seconds sooner wouldn't really help.

[–] tfw_no_toiletpaper@lemmy.world 1 points 7 months ago

OP is right, nearsightedness has been attributed to "not being outside enough" while your eyes still develop (aside from genetics of course), something to do with not getting bright enough sunlight for multiple hours as you are supposed to.

[–] psud@lemmy.world 1 points 7 months ago* (last edited 7 months ago)

There are a few ways to have bad eyesight

Short sighted, can only focus close up
Long sighted, cannot focus close up
Poor acuity, cannot see the detail others can see
Colour blindness

It looks like most of the short sightedness is caused by lifestyle since it is much more prevalent in places where children spend a lot of time indoors

The others would have affected our ancestors as much as us