Astigmatism: Types, Causes, Symptoms and Treatment Options, Animation

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.

Пікірлер: 53

  • @Alilamedicalmedia
    @Alilamedicalmedia10 ай бұрын

    Love our videos? Check out our new courses made entirely with videos like this (without watermark): www.alilaacademy.com/

  • @waelfadlallah8939
    @waelfadlallah8939 Жыл бұрын

    Finally, i understand what astigmatism means after all these years ! Good job Alila 👏

  • @greenfinchgreenfinch3094
    @greenfinchgreenfinch3094 Жыл бұрын

    I watched too many videos this is the best so far❤

  • @Fabi1701A
    @Fabi1701A Жыл бұрын

    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.

  • Жыл бұрын

    Magical content.

  • @Hola-ry2ed
    @Hola-ry2ed7 ай бұрын

    Me encantaaaa!! Gracias!!

  • @fsxpro9758
    @fsxpro97588 ай бұрын

    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? 😭👋👋

  • @Tom-zx1fn
    @Tom-zx1fn Жыл бұрын

    Thanks For Sharing It I through i was the only one,,❤️

  • @dr.anonymoussss152
    @dr.anonymoussss15211 ай бұрын

    JazakAllah Kher...May Almighty Allah give you reward fot this amazing lecture which clears my all doubts..Thanks Alot Sir❤

  • @TedEhioghae

    @TedEhioghae

    6 ай бұрын

    Allah is Lucifer. You are wishing evil upon him.

  • @WifiThing
    @WifiThing Жыл бұрын

    Got diagnosed with this when I was small. Until I stop growing I have to get more powerful glasses until I stop growing.

  • @naichertv5543
    @naichertv55434 ай бұрын

    I am rightly suffering from the same disease. Its very irritating for me I can say that blurry vision is half blind

  • @user-cz5ey8ch8p
    @user-cz5ey8ch8p4 ай бұрын

    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.

  • @voicelessverses
    @voicelessverses Жыл бұрын

    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?

  • @diandakov

    @diandakov

    Жыл бұрын

    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.....

  • @thisisnotmekhmoh3879
    @thisisnotmekhmoh38796 ай бұрын

    Great!

  • @fatimahkadiku7368
    @fatimahkadiku7368 Жыл бұрын

    One less thing I have to cram. Thank you

  • @odetarigetsomesleep
    @odetarigetsomesleep Жыл бұрын

    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.

  • @R3cce

    @R3cce

    Жыл бұрын

    I have myopia with astigmatism. Best of both😂

  • @diandakov

    @diandakov

    Жыл бұрын

    ​@@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!

  • @R3cce

    @R3cce

    Жыл бұрын

    @@diandakov Astigmatism is so annoying. Despite me having myopia, i also need glasses to see up close.

  • @diandakov

    @diandakov

    Жыл бұрын

    @@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

  • @R3cce

    @R3cce

    Жыл бұрын

    @@diandakov No, i have myopic astigmatism. The astigmatism makes vision blurry for both near and far distances.

  • @erahurka
    @erahurka2 ай бұрын

    What can cause chromatic aberrarion even without glasses? Searching the internet for months but didn't fing anything.

  • @murukeshtimetvm4119
    @murukeshtimetvm4119 Жыл бұрын

    Thank you ✨

  • @Juan.2995
    @Juan.29956 ай бұрын

    Mine is serious the deseas runs in my family of my dad side and almost all my dad relatives blind

  • @romance3624
    @romance36246 ай бұрын

    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,

  • @romance3624
    @romance36246 ай бұрын

    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

  • @malk01
    @malk01 Жыл бұрын

    I have this condition 😮

  • @yurimeijer4269

    @yurimeijer4269

    Жыл бұрын

    Same

  • @R3cce

    @R3cce

    Жыл бұрын

    same. Night vision is a absolute nightmare

  • @switchunboxing
    @switchunboxing3 ай бұрын

    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.

  • @R3cce
    @R3cce Жыл бұрын

    I have it. My night vision is terrible😂

  • @AnuAsho
    @AnuAsho Жыл бұрын

    these eye surgeries are also for small kids too??

  • @Alilamedicalmedia

    @Alilamedicalmedia

    Жыл бұрын

    Not recommended for under 18

  • @shehlanabeel2240
    @shehlanabeel2240 Жыл бұрын

    My right eye cyl -1.75 My left eye cyl -2 Is it too bad ?

  • @astudios2766

    @astudios2766

    8 ай бұрын

    Yew

  • @saigonmonopoly1105
    @saigonmonopoly110510 ай бұрын

    picking hand ful green instead of red chilli

  • @Alilamedicalmedia

    @Alilamedicalmedia

    10 ай бұрын

    Have you been checked for color blindness?

  • @saigonmonopoly1105
    @saigonmonopoly110510 ай бұрын

    wy do i see traffic light green as light blue, red chilli as green and cant differentiate between green n brown shade?/

  • @27dcmbr

    @27dcmbr

    10 ай бұрын

    You might have color blindness

  • @saigonmonopoly1105
    @saigonmonopoly110510 ай бұрын

    but i can see good face emotion

  • @Luka_Lynxboii
    @Luka_Lynxboii10 ай бұрын

    For a fact i know ill never ever wear glasses they look disgusting on me n theyre scary

  • @anonymoussoul3256
    @anonymoussoul3256 Жыл бұрын

    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

  • @doloreswinsbarrow1110
    @doloreswinsbarrow11107 ай бұрын

    I was told by my Doctor i hv Astigmatism. Hv to get glasses.

  • @davelowe1647
    @davelowe16475 ай бұрын

    Anigerstism is a real problem. I can hardly Thule pricey any move!!

  • @zcxoxz6776
    @zcxoxz677611 ай бұрын

    Oda will stop for a month due to this disease 😢