Optic Nerve Damage Peripheral Vision Loss

Treating Neuropathy and Nerve Painthe Feet

Let me start with I'm a diabetic. I developedneuropathy, which basically you lose all sensationthe feet, but it's over a period of time.It was very painful. I would have sensationsmy feet like I was standing on fire, walkingon glass. Last October it got so bad that I couldn't sleep at night. Then I met Bullard, because he's just a great physician. I wouldn't think twice, I'd recommendhim to anybody. Very compassionate, very thorough, I can't say enough about Bullard. He'sjust a great physician and I don't know if there's anything he couldn't do hecould probably move mountains if he wanted to!Glen, probably one of the biggest questions

people are asking you is what'd we do, what'shappened. Of course, you had a tremendous improvementyour pain and the tinglingand the numbness. Easiest explanation is, to tell everybody, that this big nerve here,which is on the inside part of your left foot, was getting strangled. There was a noose aroundit. What we did is we wentand loosened the noose, and that allows that nerve to beginto function and work like it's supposed to.Now, the sensation is coming back, it's something that's going to take time butI can feel more. My quality of life has greatly improved since I had the procedure done by Bullard. There's no other physician

that I would recommend.Glen,the next couple weeks, what we're going to do is make sure that the swellingis improving, hopefully begin to transition you out of your compression socks, becauseI know it's kind of hot right now, and then look at making sure that your shoe gear andthings like that are where they're supposed to be, fitting you well, protecting your feetand stuff. Ok? Very good. Thank you, I appreciate it, havea good weekend! You do the same. Alright, see ya.

Development of Glaucoma Animation Open Angle vs Angle Closure Glaucoma

Glaucoma is a group of eye diseaseswhichthe optic nerve is damaged leading to irreversible loss of vision. In most cases, this damageis due to an increased pressure within the eye.The eye produces a fluid called aqueous humor which is secreted by the ciliary body intothe posterior chamber a space between the iris and the lens. It then flows through thepupil into the anterior chamber between the iris and the cornea. From here, it ainsthrough a spongelike structure loed at the base of the iris called the trabecularmeshwork and leaves the eye. In a healthy eye, the rate of secretion balances the rateof ainage.

In people with glaucoma, the ainage canalis partially or completely blocked. Fluid builds upthe chambers and this increasespressure within the eye. The pressure ives the lens back and presses on the vitreousbody whichturn compresses and damages the blood vessels and nerve fibers runningat the back of the eye. These damaged nerve fibers resultpatches of vision loss, andif left untreated, may lead to total blindness. There are two main types of glaucoma: openangleand angleclosure. Openangle glaucoma , or chronic glaucoma,is caused by partial blockage of the ainage canal. The angle between the cornea and theiris is quot;openquot;, meaning the entrance to the

ain is clear, but the flow of aqueous humoris somewhat slow. The pressure builds up graduallythe eye over a long period of time. Symptomsappear gradually, starting from peripheral vision loss, and may go on unnoticed untilthe central vision is affected. Progression of glaucoma can be stopped with medical treatments,but part of vision that is already lost can not be restored. This is why it's very importantto detect signs of glaucoma early with regular eye exams.Angleclosure glaucoma, or acute glaucoma, is caused by a sudden and complete blockageof aqueous humor ainage. The pressure within the eye rises rapidly and may lead to totalvision loss quickly. Certain anatomical features

of the eye such as narrow ainage angle,shallow anterior chamber, thin and oopy iris, make it easier to develop acute glaucoma.Typically, this happens when the pupil is dilated and the lens is stuck to the backof the iris. This prevents the aqueous humor from flowing through the pupil into the anteriorchamber. Accumulation of fluidthe posterior chamber presses on the iris causing it tobulge outward and block the ainage angle completely. Acute angleclosure glaucoma isa medical emergency and requires immediate attention.

Why Do We Have Blind Spots

We're going to do a little experiment. Make sure you watch this part of the tutorialin full screen. Close or cover your left eye, look at theplus sign. Be aware of the circle, but don't focus on it! Keep looking at the plus. You may need to move your head back and fortha little bit, or move your thing closer to your face. But at some point, the circle isgoing to disappear. Now close your right eye and look at the circle.Move your head back and forth until the plus sign disappears.

You've just found your naturally occurringblind spoteach eye. And of course daily practice we do not notice this. The human eye has what you might call a fundamentalflaw. Lightsensing cellsyour retina send signals to your brain via nerves. And thosenerves arefront of the lightsensing cells. Eventually, those nerves have to pass throughthe back of your eye to get to your brain andthe part of your retina where theypass through, there aren't any lightsensing cells. That's your blind spot. Now this isn't normally a problem, becausethe blind spots are loed at slightly different

pointseach eye, and each of your eyeswork together to filla complete picture. But even with one eye closed, you're notseeing a big black hole. Instead, your brain fillswhat it figures ought to be there.That's why, when the circle disappears, you see the color of the background. Yourbrain is guessing, and it's guessing wrong. Although! At least one very small study foundthat you might be able to shrink your blind spot with practice. Researchers showed ten participants an imagethat fell within the margins of their blind spots and asked them to describe it. By theend of the experiment, people got a little

better at describing those images. The researchers think it's because the lightsensingcells right around the edges of the blind spots became more sensitivebetter at pickingup and passing on light signals. That's the kind of skill that's probablynot going to ever make any kind of differencea lifeordeath situation, and humans havehad blind spotstheir eyes for as long as we've had eyes. But it's a neat wayto try and hone your brain, if you're into that sort of thing. There is a different kind of creature, though,that just completely avoids this problem.

Cephalopods, like octopuses and squids, havetheir nerves behind their lightsensing cells, so there's no need for them to have a blindspot. Why did we not do it that way? Evolution.Well I, for one, welcome our tentacled overlords. Thank you for asking, and thank you especiallyto all of our patrons on Patreon who keep these answers coming. If you'd like to submitquestions to be answered, or get these Quick Questions a few days before everyone else,you can go to patreon scishow. And if you just want to keep getting smarter withus, you can go to scishow and subscribe! Just do it.

Category: Peripheral Neuropathy

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