www.handwritten... - An explanation of the confusing ciliary muscle contraction process. For more entirely FREE tutorials and accompanying PDFs visit www.handwritten...
Hi! I dont know if someone has answered your question since it has been 9months. But, just in case, when the ciliary muscles contract the zonular fibers relax, which in turn relaxes the lens, thus making the lens more convex. The reason for this is that the ciliary muscles are sphincter muscles, thus when contracting they will move towards the lens (basically, moving closer to each other), that is why the lens and the zonular fibers relaxes. This is what happens in Near Vision.
Very helpful, I was thinking that the ciliary m were the ones that flattened the lens when they contracted. The baseline tension on the zonules was the part I missed somewhere along the way. Thanks!
i thought you were going to talk about ciliary muscle contraction with respect to miosis and mydriasis. does it follow the same rule? but then how come you the pupil change in size?? a bit confused.
Hi. ciliary muscle does not lie behind iris attached to it (i mean it does not lie attached to posterior surface of the iris). You could have talked about the arrangements of the muscle fibres in the ciliary body.. that would probably makes sense!
@SoHoTandCool Miosis and Mydriasis are movements of the pupil. The pupil's size is not controlled by the Ciliary muscles but rather two muscles known as "Sphincter Pupillae" and "Dilator Pupillae". This has nothing to do with the ciliary muscles or the lens. NB. You might be getting confused by the Ciliary Ganglion which is a parasympathetic nerve ganglion at the back of the eye which give nervous innervation to the Sphincter Pupillae and the Cillary muscles.
I don't know if anyone noticed, but these diagrams look like funny faces if you look at the picture as if > the eye which you drew is the head, > the lens being the mouth, > and the horizontal lines being the eyes. On a different note. Thank you for explaining this. Usually, it is generally said that the eye is "relaxed" when viewing in the distance and "stressed" when looking closeup. But in reality, different muscles are being contracted and stretched for both near and far. There is theory that chronic pseudomyopia (the spasm of the ciliary muscles where they remain in the contracted state) leads to axial elongation of the eye resulting in permanent myopia. I wonder if inducing chronic pseudohyperopia (causing the zonules to be contracted state due to a spasm) may cause axial shortening. That could explain how myopia can be reversed.
Im curious about this too, I noticed from less sunlight exposure and many more screen time (close) I started having double vision mainly for digital words and lights and also more blurry vision in general far away but nothing super severe I can still see pretty well, just stuff is more blurry and not as crispy. So if looking at something close contracts the muscles, I wonder if the same as you à re inducing hyperopia and relaxing the cillary muscles attached to the zonules pulling on the lens can shift the eyeball length back to its proper alignment. I feel like this could be why myopia isn't seen as reversible because all we do is get glasses to refract light into the lens properly, but not address the possible forces that cause the eyeball to elongate. 😭
Other than an electrical charge - is there a way to force a contraction of these tiny muscles. Say for instance forcing the eye to focus on small and distant things in rapid movement.
This was one of those questions that confused me but, I was too overwhelmed with so many other things that I didn't bother to ask. The textbook didn't cover it so, I knew it wasn't on the test. With the semester over I am able to look at things now that confused me before. Thank you for reducing the confusion.
Thank you. Now why couldn't the optician have explained that to me yesterday?! Out of interest what happens with cycloplegic drops - I guess everything relaxes so how does that work?
So when the ciliary mm weaken, one loses the ability to see close and will require reading glasses. Can one strengthen the ciliary muscles and thereby see closer and not need reading glasses?
It is somewhat of a misconception to say that the ciliary muscles are getting weak with age. With the natural course of life, the lens is getting more and more dense (it is actually made of cells that are shaped like fibers that go from one end to the other and the count of cells at birth is only inscreased throughout life. The problem is that for the higher number of cells can only take up the same volume, therefore causing an increase in density). The real limitation is the deformation of the lens, which is limited by the density. Long story short : it's impossible :/
Theory: if part f the reason our vision goes bad is because the lens is misshaped. Than perhaps the weakness isn't the lens all of the time. Perhaps its the tiny smooth muscles which control the lens shape. If that's the case, strengthening these tiny muscles is a good idea. One way to do this is to rapidly shift eye focus from reading sized letters to large print over on a wall. I only did this once, I felt like I really was exercising these tiny muscles. More experimentation is required.
Cheers for the Video! Forgive me for butting in, I would appreciate your initial thoughts. Have you heard about - Ciyackorn Lothario Fraternity (Sure I saw it on Google)? It is a great one off product for finding the secret to improve your eyesight naturally without the normal expense. Ive heard some extraordinary things about it and my close friend Aubrey at last got cool results with it.
@eugenekhcha The way the ciliary muscle and eye drawn here is not entirely accurate. When we look in the distance, our ciliary muscle is relaxed. In this state, the ciliary body is actually laying posterior (back) to the lens, which connects to the ciliary body by zonules from the lens' capsule. This is WHY the zonules fibers is TAUT. When we look at something up close, we contract the ciliary muscle which actually moves it up more anterior, relaxing the zonules, which increase lens thickness.
I still don't understand what causes the tension on the zonules. Clearly the ciliary muscles aren't providing the tension (pulling on the zonules) because other wise when the ciliary muscles are taut the zonules would be taut. So what are the zonules and ciliary muscles both pulling at?
hmmmm first of all thanks for sharing this it was helpful but still i have something i cant really understand :: how can the zonular fibers be relaxed while the ciliary muscle is contracted ??????
Still unclear,You can try this- The anterior end of ciliary muscle is fixed,the lens is attached with posterior part of the muscle,,, If the muscle contracts by parasympathetic action> it pulls the lens forward and as the eye ball is globular,the lens get itself in a less space>traction on suspensory ligament decrease>LENS BECOME GLOBULAR During relaxation by sympathetic or parasympathetic blocker,The muscle comes posteriorly>Lens get more space(as eyeball is round)>Traction in suspensory ligament increased>lens become flattened
Your explanation is nonsensical. First, the ciliary body does not lie behind the iris. It is continuous with the iris. Secondly, where do the weights come from? If there is, in fact, some justification for your explanation, then you need to be a lot more precise.
He literally said his drawing isn't anatomically correct. He's doing it to show the antagonistic relationship between the zonules and the cilliary muscles
@@JJustJ-yb9wh I'm not totally convinced that his concept is correct. The best explanation I've seen is where the ciliary muscle is oriented radially at about a 50 degree angle from perpendicular and where the origin of the muscle is toward the anterior and center of the eye so that when it contracts, it pulls the rest of the muscle anteriorly and toward the center thereby releasing tension on the zonules.
@@JJustJ-yb9wh Thanks. I've seen several explanations for how the ciliary body supposedly works, but the one I just described seems to be the simplest and most convincing. Is it in fact true? Honestly, I don't know.
Hi! I dont know if someone has answered your question since it has been 9months. But, just in case, when the ciliary muscles contract the zonular fibers relax, which in turn relaxes the lens, thus making the lens more convex. The reason for this is that the ciliary muscles are sphincter muscles, thus when contracting they will move towards the lens (basically, moving closer to each other), that is why the lens and the zonular fibers relaxes. This is what happens in Near Vision.
This was really helpful! Thanks!
thanks for this!
Thank you much. I finished medical school before I got the a convincing answer like yours
Very helpful, I was thinking that the ciliary m were the ones that flattened the lens when they contracted. The baseline tension on the zonules was the part I missed somewhere along the way. Thanks!
How old are you now?
i thought you were going to talk about ciliary muscle contraction with respect to miosis and mydriasis. does it follow the same rule? but then how come you the pupil change in size?? a bit confused.
Hi. ciliary muscle does not lie behind iris attached to it (i mean it does not lie attached to posterior surface of the iris).
You could have talked about the arrangements of the muscle fibres in the ciliary body.. that would probably makes sense!
Also, the way he showed contraction and relaxation resulting in the lens adjustment was most probably not correct
@SoHoTandCool Miosis and Mydriasis are movements of the pupil. The pupil's size is not controlled by the Ciliary muscles but rather two muscles known as "Sphincter Pupillae" and "Dilator Pupillae". This has nothing to do with the ciliary muscles or the lens.
NB. You might be getting confused by the Ciliary Ganglion which is a parasympathetic nerve ganglion at the back of the eye which give nervous innervation to the Sphincter Pupillae and the Cillary muscles.
I don't know if anyone noticed, but these diagrams look like funny faces if you look at the picture as if
> the eye which you drew is the head,
> the lens being the mouth,
> and the horizontal lines being the eyes.
On a different note. Thank you for explaining this. Usually, it is generally said that the eye is "relaxed" when viewing in the distance and "stressed" when looking closeup. But in reality, different muscles are being contracted and stretched for both near and far.
There is theory that chronic pseudomyopia (the spasm of the ciliary muscles where they remain in the contracted state) leads to axial elongation of the eye resulting in permanent myopia.
I wonder if inducing chronic pseudohyperopia (causing the zonules to be contracted state due to a spasm) may cause axial shortening.
That could explain how myopia can be reversed.
Im curious about this too, I noticed from less sunlight exposure and many more screen time (close) I started having double vision mainly for digital words and lights and also more blurry vision in general far away but nothing super severe I can still see pretty well, just stuff is more blurry and not as crispy. So if looking at something close contracts the muscles, I wonder if the same as you à re inducing hyperopia and relaxing the cillary muscles attached to the zonules pulling on the lens can shift the eyeball length back to its proper alignment.
I feel like this could be why myopia isn't seen as reversible because all we do is get glasses to refract light into the lens properly, but not address the possible forces that cause the eyeball to elongate. 😭
Glory be to God for designing such an intricate system of the eye.
Other than an electrical charge - is there a way to force a contraction of these tiny muscles. Say for instance forcing the eye to focus on small and distant things in rapid movement.
Finally understood it after all these years... thank you😊
those little weights finally made me understand this ! thank youuuu!
This was one of those questions that confused me but, I was too overwhelmed with so many other things that I didn't bother to ask. The textbook didn't cover it so, I knew it wasn't on the test. With the semester over I am able to look at things now that confused me before. Thank you for reducing the confusion.
Thank you. Now why couldn't the optician have explained that to me yesterday?! Out of interest what happens with cycloplegic drops - I guess everything relaxes so how does that work?
finally understanding that ...ty
So when the ciliary mm weaken, one loses the ability to see close and will require reading glasses. Can one strengthen the ciliary muscles and thereby see closer and not need reading glasses?
It is somewhat of a misconception to say that the ciliary muscles are getting weak with age. With the natural course of life, the lens is getting more and more dense (it is actually made of cells that are shaped like fibers that go from one end to the other and the count of cells at birth is only inscreased throughout life. The problem is that for the higher number of cells can only take up the same volume, therefore causing an increase in density). The real limitation is the deformation of the lens, which is limited by the density. Long story short : it's impossible :/
Thanks for making it make sense . .
Thank you so much, the tiny weights really helped with visualizing it better in my mind!
Theory: if part f the reason our vision goes bad is because the lens is misshaped. Than perhaps the weakness isn't the lens all of the time. Perhaps its the tiny smooth muscles which control the lens shape. If that's the case, strengthening these tiny muscles is a good idea. One way to do this is to rapidly shift eye focus from reading sized letters to large print over on a wall. I only did this once, I felt like I really was exercising these tiny muscles. More experimentation is required.
length of time was over an hour.
I was told yesterday I had a spasm in my ciliary muscles! Now it all makes sense. Thank you so much!
Thanks brother! Even the Jesus needs a refresher.
Cheers for the Video! Forgive me for butting in, I would appreciate your initial thoughts. Have you heard about - Ciyackorn Lothario Fraternity (Sure I saw it on Google)? It is a great one off product for finding the secret to improve your eyesight naturally without the normal expense. Ive heard some extraordinary things about it and my close friend Aubrey at last got cool results with it.
THIS MAKES SO MUCH SENSE NOW THANK YOU
It has finally clicked!!! Beautiful!
@harpinmartin - What causes the tension in the zonules?
Very Very Very Helpful. Thank you so much
Thank you sir... I watched many videos but only your video cleared my doubt thank you ❤️❤️❤️
I really like your illustrations
@eugenekhcha The way the ciliary muscle and eye drawn here is not entirely accurate. When we look in the distance, our ciliary muscle is relaxed. In this state, the ciliary body is actually laying posterior (back) to the lens, which connects to the ciliary body by zonules from the lens' capsule. This is WHY the zonules fibers is TAUT. When we look at something up close, we contract the ciliary muscle which actually moves it up more anterior, relaxing the zonules, which increase lens thickness.
Since when does the ciliary muscle attach to the posterior aspect of the iris? A little more anatomy might clarify.
v good.....but which book shows this anatomical arrangement ????
This helped me so much
I still don't understand what causes the tension on the zonules. Clearly the ciliary muscles aren't providing the tension (pulling on the zonules) because other wise when the ciliary muscles are taut the zonules would be taut. So what are the zonules and ciliary muscles both pulling at?
How does this contraction releives open angle glaucoma ?
Please answer me
Wow I was super struggling to understand this until now, thanks
I can control it, is that something rare and/or is bad for me?
I can only blur my vision.
Excellent! the best explanation so far... 😃 👍🏻🙏🏻
Thank you for this good illustration 🖤
Nice.
But the total eye changes.
You can not isolate the change.
finally understand this concept. thank you!
Thank you sir for such an amazing explanation
0:40 is that a sad birb ?
hmmmm first of all thanks for sharing this it was helpful but still i have something i cant really understand :: how can the zonular fibers be relaxed while the ciliary muscle is contracted ??????
Very good sir
👏
Still unclear,You can try this-
The anterior end of ciliary muscle is fixed,the lens is attached with posterior part of the muscle,,,
If the muscle contracts by parasympathetic action> it pulls the lens forward and as the eye ball is globular,the lens get itself in a less space>traction on suspensory ligament decrease>LENS BECOME GLOBULAR
During relaxation by sympathetic or parasympathetic blocker,The muscle comes posteriorly>Lens get more space(as eyeball is round)>Traction in suspensory ligament increased>lens become flattened
Wow that's beautiful
excellent as always.
Perfectly explained. Thank you!
Do you think you could draw and print any smaller?
Thank you! Couldn't find the answer I was looking for anywhere else
Thank you very much...
Thank you. This was very useful
THANK YOU
you draw faces really well. you should be a caricaturist xxx
Good knowledge
甚麼是隱性遠視? what is latent hyperopia?
This video helped a lot. Thank you!!!
Hii Ruth! What you doin?
fantastic! great explanation
could someone please provide an answer to @eugenekhcha 's response? i'm having the same misunderstanding here.
Wow well explained
This saved me
@Brlg1battlemaster ur explanation was really helpfull
Thank you! now I get it! :)
Тор Мusсlе Building Fооооds: ЕЕЕЕаt Тhеsе Fооds ТТТо Gаin Мusclееее Маss Quiсklу Rеаd hеrе nоw => twitter.com/9be7af2d44aab842b/status/742668391975096320 Ciliааааrу Мusсle Cоntrасtiоn
Ty
For a long time before I though m.cilliary make the lens become thinner.
Thanks, well done!
Yaa finally i got solution thnxs
BRAVO
i hoped that was explained in the vedio .. thanks
Thank you soo much!
Ty!!!
Thanks
Thank you
So match
THANKYOU ! 😍😍
Your gum chewing is annoyingly distracting.
i didnt even hear it, watch in faster speed to block fade it out. thank you for the vid!
thanks!
thank you soo much ^^
Thanku
Thanks! My med school anatomy text was rather confusing on this subject.
Same here but I am a med student while you are already a doctor now 😂
solid
up to now i cant understand this too !!!!!!
I can control my ciliary muscles
Ciliary muscle contraction that wont release due to too much close up viewing is the beginning of myopia
💓
I did 1.1 k like
Jisa lgta ha ki right hu wo like kra
Your explanation is nonsensical. First, the ciliary body does not lie behind the iris. It is continuous with the iris. Secondly, where do the weights come from? If there is, in fact, some justification for your explanation, then you need to be a lot more precise.
He literally said his drawing isn't anatomically correct. He's doing it to show the antagonistic relationship between the zonules and the cilliary muscles
@@JJustJ-yb9wh Well, it's bogus.
@@JJustJ-yb9wh I'm not totally convinced that his concept is correct. The best explanation I've seen is where the ciliary muscle is oriented radially at about a 50 degree angle from perpendicular and where the origin of the muscle is toward the anterior and center of the eye so that when it contracts, it pulls the rest of the muscle anteriorly and toward the center thereby releasing tension on the zonules.
@@enochbrown8178 I can see how that would be better
@@JJustJ-yb9wh Thanks. I've seen several explanations for how the ciliary body supposedly works, but the one I just described seems to be the simplest and most convincing. Is it in fact true? Honestly, I don't know.
I suspect that your illustration is not precisely correct.
ağzını şapırdatma ya
This dude has a dry mouth lol
the sounds of your mouth or something is quite off putting
Bkwas teacher duniya ma koi apka jasa
thank you so much!