Astigmatism: Types, Causes, Symptoms and Treatment Options, Animation
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- Опубликовано: 28 авг 2024
- Corneal and lenticular astigmatism; regular and irregular astigmatism. Types of contact lenses for astigmatism (toric, rigid, hybrid), and more.
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Astigmatism is a very common eye problem that produces blurry vision. It is caused by an imperfection in the shape of either the cornea or the lens - the 2 structures responsible for focusing images of visual objects.
Ideally, both the cornea and the lens have a curvature of a perfectly round sphere. They refract light evenly, producing a sharp image. In astigmatism, either the cornea or the lens is misshaped. Most commonly, the cornea is oval-shaped instead of round; it bends light rays coming in different planes differently, creating multiple focal points, hence multiple images of the same object, causing blurry vision. Both near and far vision can be affected.
Astigmatism is assessed using lines, called meridians. A perfectly shaped cornea has a consistent curvature in all meridians. With astigmatism, some meridians have a steeper, or flatter, arc than others.
Astigmatism is classified as corneal or lenticular depending on the structure that is misshaped.
It is also specified as regular or irregular:
- Regular astigmatism is typically present from birth and may be inherited.
- Irregular astigmatism is most commonly caused by injuries, scarring, conditions such as keratoconus, or previous eye surgery.
Astigmatism is treated with corrective lenses or refractive surgery.
Corrective lenses are designed to counteract the optical error produced by the misshaped cornea or lens. They can be worn in the form of regular glasses, or contact lenses.
There are several types of contact lenses:
- Toric lenses are soft contact lenses that correct astigmatism. Unlike a regular contact, a toric lens is shaped like a small slice of a donut. This shape creates different refractive powers on different planes, thus compensating for the different curvatures of an astigmatic cornea or lens. A toric lens must be worn in the right orientation to be effective.
- Gas permeable lenses are rigid lenses that retain their shape on the eye surface. They can be of regular or toric shape. Rigid lenses can also be worn at night to reshape the corneal surface, much like dental braces for teeth, in a procedure called orthokeratology.
- There are also hybrid lenses, essentially a hybrid between soft and rigid lenses.
Refractive eye surgeries use laser to reshape the cornea and can treat most cases of astigmatism, corneal and lenticular. Several types of refractive surgeries are available, each have their pluses and minuses.
Lenticular astigmatism can also be treated with lens replacement, in a procedure similar to cataract surgery. This procedure is particularly helpful when the patient also has cataract, as it can fix both problems at once. Patients with corneal astigmatism and cataract may benefit from a cataract surgery with toric intraocular lenses.
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Finally, i understand what astigmatism means after all these years ! Good job Alila 👏
I had to small hard contact lenses in the 90s , small and hard and it took weeks to adjust going every Wednesday for 6 weeks to the specialist. I was thrilled, for the first time I was able to see sharper objects, I also was nearsighted. I went crazy when I saw myself without glasses in the mirror, I starred at my face for a long time , every time! I had never seen it so sharp and fat somewhat . Everything seemed to look bigger with the lenses. And then disaster, after two weeks, my left eye rejected the lense . According to the specialist the transition didn’t occur. The left eyes was the weakest with the glasses but became the strongest with lenses. The right was the strongest with glasses but became the weakest with lenses. Resulting in the left lense rotating all the time and popping out frequently. I am considered having a heavy prescription now even though my astigmatism is getting better. I was strongly advised not to have surgery, I am not a suitable candidate, also , I had tear and wear on both retinas, and had laser procedure for that.
I watched too many videos this is the best so far❤
I Have astigmatism but it's not a serious or bad problem for me. I hate wearing glasses so I don't wear it. My astigmatism gets worse if I cry and look at the lights.
I have myopia with astigmatism. Best of both😂
@@R3cceme too and it's not much but it still is annoying me and I wanted to put on glasses which turned out to be helpful!
@@diandakov
Astigmatism is so annoying. Despite me having myopia, i also need glasses to see up close.
@@R3cce are you saying you have both myopia and hypermetropia? If you have myopia you should be able to see close objects and see blurry the far objects
@@diandakov
No, i have myopic astigmatism. The astigmatism makes vision blurry for both near and far distances.
JazakAllah Kher...May Almighty Allah give you reward fot this amazing lecture which clears my all doubts..Thanks Alot Sir❤
Allah is Lucifer.
You are wishing evil upon him.
This is why I hate driving in the night
I was diagnosed with astigmatism 7 months ago 1:13
Very helpful information..
I started seeing blurry far away objects.... months later it was worse. I suffered trauma, from losing my career job, then 4 family members the same month. The Stress was beyond human capabilities... i just lost it. My eyesight got so bad. I checked them, and was told i had cataracts and Astigmatism,.. myopia.! 😫😞
Got diagnosed with this when I was small. Until I stop growing I have to get more powerful glasses until I stop growing.
Explanation world class
Please Help !! I have myopia on left eye and on my right eye have astigmatism but my vision is -1.25 and 75 so do you have any idea to slowe astigmatism eye to see normal light without glasses? 😭👋👋
Magical content.
I am rightly suffering from the same disease. Its very irritating for me
I can say that blurry vision is half blind
Thanks For Sharing It I through i was the only one,,❤️
I have mild headache everyday and my vision blurred. I have been confine when i was chlild due to my eyesight. I have my eyeglasses but it was broken. I was completely nervous because my headache didnt stop.
Me encantaaaa!! Gracias!!
I was just diagnosed with it but I never was diagnosed prior and I’ve been wearing glasses and contacts for years… what causes it??
ugh same . dis is stupid
Oh, I thought astigmatism meant that bright lights at night seem brighter and have artifacts coming off of them. That’s the only symptom I have. I don’t have blurry vision I don’t think. But it’s weird this only started a year ago.
Mine is serious the deseas runs in my family of my dad side and almost all my dad relatives blind
Could a mild -0.5 astigmatism cause eye twitching for over 9 months? The headache has gone since I have had my glasses prescription changed, but my left eye is still twitching and has been continually since June 2022. Any ideas please?
You should go to the doctor because the twitching is due to nerve system problems if it's for such a long time! It has nothing to do with bad eye sight.....
the only Treatment is take care our eyes, 1 ) use sunglasses all thet ime we go out side, , 2 ) don,t force our eyes watching tv, or cell phones, or pc, or read, 3 ) eat healthy, do workout every day, with this our eyes graduations will stay good,
I have this condition 😮
Same
same. Night vision is a absolute nightmare
My right eye cyl -1.75
My left eye cyl -2
Is it too bad ?
Yew
Me with - 3.5 & - 4.0: no you're alright. Just wear glasses
What can cause chromatic aberrarion even without glasses? Searching the internet for months but didn't fing anything.
I have it. My night vision is terrible😂
these eye surgeries are also for small kids too??
Not recommended for under 18
One less thing I have to cram. Thank you
Great!
i used contact and glasses and they never helped me, i use only sunglasses and my graduation keep in the same graduation since i was 12 years old, the secret is , eat good, use sunglasses, don,t watch tv near it, or pc or cellphone, don,t force your eyes to read and other things and cover my eyes from all light possible, glasses and contact is bad, because increaise the light and hurt my eyes, now i,m 53 years old and my graduation is stable and i see better more than using glasses or contact, ohh the contact thing is bad for the eyes, thats why i don,t use it anymore
picking hand ful green instead of red chilli
Have you been checked for color blindness?
I think anxiety and fear much crying got me worse astigmatism year after year
I believe it. I had a good life, then tragedy hit,.. the trauma and losses were devastating.
I have severe anxiety and depression. It's destroyed my life and my eyesight. It just keeps getting worse,... and I think it's the anxiety, and the constant crying..! Everyday 😭😫
@@klanderkal hope peace for you💔
Thank you ✨
wy do i see traffic light green as light blue, red chilli as green and cant differentiate between green n brown shade?/
You might have color blindness
I was told by my Doctor i hv Astigmatism. Hv to get glasses.
My right eye has sph- 2.50 with cyl.- 0.75 with axis 160 but left has sph -3.00 with cyl -1.00 with axis 10
But in glass left axis is 4
Should I change my glasss.. Will it affect my vision
but i can see good face emotion
For a fact i know ill never ever wear glasses they look disgusting on me n theyre scary
✝️🙏🏿✝️🙏🏿✝️
Anigerstism is a real problem. I can hardly Thule pricey any move!!
Oda will stop for a month due to this disease 😢