What are the signs you are going blindé If you can't read street signs from thedistance you used to, you may be going blind. Or need glasses. How can I tell the differenceé If things get blurrier over time, you mightbe developing cataracts, as the outer layers of the eye become like scratched up glass.Or you're becoming nearsighted and farsighted as the lenses stiffen. I've never heard of having both nearsightednessand farsightedness in one person.
What do you think bifocals and trifocals treaté I'd like to know something that is a signof actual blindness, not needing glasses. If you've had a head injury or stroke andnow have part of the field of vision turn red or dark, get to a to check theretina. And get to an eye if you have floaters. What are floatersé If you have floating spots in your field ofvision, that is a possible sign of vision problems. It is serious if you have red visionor head pain at the same time.
Or it could be a sign of old age. Blurred vision, seeing colored rainbows andred eyes are signs of glaucoma. And glaucoma is one of the leading causes of blindness. I thought that could be treated with surgery. Surgery can ease the pressure in the eye.And they may give you medicine to treat the blood pressure and underlying cause. Diabetes. Diabetes is not glaucoma, but the deteriorationof the blood vessels that causes so many diabetics
to lose kidney function and their feet canleave them blind, too. Yet another reason to lay off the sweets andget up and get moving. Or at least manage your blood sugar properlyin old age. But if it saves your vision, eating almostanything is worth it. I never would have thought I'd want to seeoat bran and prunes as an old person.
Why Do People Have Blind Spots
This episode was proudly made possible bythe allnew 2015 Subaru Legacy. It's not just a sedan, it's a Subaru. Can you see everything on the screen withoutmoving your eyesé Look at me did you see thaté Didn't think so.a Howdy lookers, thanks for tuning into DNews,I'm Trace. Eyes are little 1 inch diameter balls (2.54 cm) tucked in your head, and thoughthey're magnificent, human eyes aren't even CLOSE to the best in the animal kingdom. Infact, your brain is tricking you into thinking your eye is seeing things that aren't thereRIGHT NOW. We've all got blind spots that
we can't see, and huge sections of our visionare justâ€¦ wrong! Take a piece of paper with a dot and a pluson it. Close one eye, hold the paper close to your face and look straight at the dot,pulling it away slowly. Eventually, the plus should disappear! That's your blind spot.If you switch eyes, the dot should disappear. You might have to try it a couple of times.To understand WHY this happens, we have to go inside the eye. If you could fly into the pupil and insidethe eyeball to look around you'd be floating in vitreous humor of the inner eye. It's aclear, gellike material. On the walls of
the eye, you'd see blood vessels streamingeverywhere, and spread across the back of the eye you'd see the rod and cone cells ofthe retina. Rods are for low light, cones are for color and visual detail. If you got closer to the retina, you couldspot the macula right in the middle with only cone cells that's the only part of yourvision that you can see clearly. If you look at my face here, you can see it clearly, butwhile still looking at my face pay attention to the walls around me, or my shirt. It'sVERY difficult to comprehend the rest of your visual field. The macula is truly the onlypoint of visual clarity!
From there, you could follow the nerves ofthe retina, like following a bunch of extension cords to the wall. Eventually, you'd get tothe optic disk; a part of the eye with no rods or cones. That's where the optic nerveenters the eyeball! It's kind of like where your eye plugs in. And it causes a blind spot.There's nothing there for your eye to perceive since there are no rod or cone cells! My eye was nice enough to send me apicture of the inside of my own eye. You can see the macula here, and the optic nerve here.That is my point of clarity, and my blind spot!
If it seems stupid to have a blind spot, you'reright. Cephalapods don't have one, because their optic nerves run BEHIND the retina ratherthan in front of it. Think of it this way, cephalopods have their wiring inside the walls,but because of an unfortunate evolutionary mutation, mammals didn't and thus we all haveblind spots. The reason you don't see this spot all thetime is because your brain fills it in. Try doing the dot and plus experiment with a pieceof colorful paper and your brain will fill it in with color. That's your brain trickingyou into thinking your vision is perfect, when it's really not. Silly brain, tricksare for nonscientists.
Blind spots are very important to be awareof especially when you're driving! That's why we wanna thank Subaru for making thisepisode possible. And especially the allnew 2015 Subaru Legacy. Every sedan has its benefits,but only one combines them all. It's not just a sedan. It's a Subaru. If you could have the eyes of another animal,which would it beé Catsé Eaglesé Cephalopodsé Mantis Shrimpé!We're watching for your comments, so leave one. Thanks for watching DNews. Here's lookingat you, kid. Please subscribe.