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.

@bhushanbarhate6069

2 жыл бұрын

This was really helpful! Thanks!

@ayeleru7489

Жыл бұрын

thanks for this!

@OurHealth200

2 ай бұрын

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!

@mohammadyousuf1856

10 ай бұрын

How old are you now?

Thank you so much, the tiny weights really helped with visualizing it better in my mind!

Finally understood it after all these years... thank you😊

those little weights finally made me understand this ! thank youuuu!

THIS MAKES SO MUCH SENSE NOW THANK YOU

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.

I was told yesterday I had a spasm in my ciliary muscles! Now it all makes sense. Thank you so much!

Perfectly explained. Thank you!

Excellent! the best explanation so far... 😃 👍🏻🙏🏻

Thank you sir... I watched many videos but only your video cleared my doubt thank you ❤️❤️❤️

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.

@charmolypi

11 ай бұрын

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.

Very Very Very Helpful. Thank you so much

finally understanding that ...ty

@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.

Thank you sir for such an amazing explanation

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!

@bikashchandramondal3713

3 жыл бұрын

Also, the way he showed contraction and relaxation resulting in the lens adjustment was most probably not correct

excellent as always.

Thank you for this good illustration 🖤

Thank you! Couldn't find the answer I was looking for anywhere else

Wow I was super struggling to understand this until now, thanks

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 understand this concept. thank you!

Thank you. This was very useful

fantastic! great explanation

I really like your illustrations

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.

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.

It has finally clicked!!! Beautiful!

This helped me so much

@harpinmartin - What causes the tension in the zonules?

Thanks, well done!

Thank you very much...

Very good sir 👏

This video helped a lot. Thank you!!!

@ShivamMishra-xs1fq

5 жыл бұрын

Hii Ruth! What you doin?

thank you so much!

Thank you soo much!

thank you soo much ^^

THANKYOU ! 😍😍

Yaa finally i got solution thnxs

v good.....but which book shows this anatomical arrangement ????

Wow that's beautiful

Good knowledge

@Brlg1battlemaster ur explanation was really helpfull

Thanks brother! Even the Jesus needs a refresher.

@roxaneeichmann2196

4 жыл бұрын

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.

Since when does the ciliary muscle attach to the posterior aspect of the iris? A little more anatomy might clarify.

Thank you So match

Thank you! now I get it! :)

@kristijanjankov8479

7 жыл бұрын

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Wow well explained

How does this contraction releives open angle glaucoma ? Please answer me

THANK YOU

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.

@ChildePC

6 жыл бұрын

length of time was over an hour.

Do you think you could draw and print any smaller?

thanks!

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?

could someone please provide an answer to @eugenekhcha 's response? i'm having the same misunderstanding here.

Ty!!!

you draw faces really well. you should be a caricaturist xxx

This saved me

I can control it, is that something rare and/or is bad for me? I can only blur my vision.

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 ??????

@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.

Thanks

BRAVO

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?

@antoineaidansvanderpoel7785

7 жыл бұрын

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 :/

@TimLayla

7 жыл бұрын

Thanks for making it make sense . .

甚麼是隱性遠視? what is latent hyperopia?

i hoped that was explained in the vedio .. thanks

solid

Ty

For a long time before I though m.cilliary make the lens become thinner.

Thanku

0:40 is that a sad birb ?

Nice. But the total eye changes. You can not isolate the change.

up to now i cant understand this too !!!!!!

💓

Thanks! My med school anatomy text was rather confusing on this subject.

@Mohammed-uf6hk

3 жыл бұрын

Same here but I am a med student while you are already a doctor now 😂

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

I can control my ciliary muscles

I did 1.1 k like

Ciliary muscle contraction that wont release due to too much close up viewing is the beginning of myopia

Your gum chewing is annoyingly distracting.

@sepehrhashemi428

10 жыл бұрын

i didnt even hear it, watch in faster speed to block fade it out. thank you for the vid!

Jisa lgta ha ki right hu wo like kra

ağzını şapırdatma ya

This dude has a dry mouth lol

I suspect that your illustration is not precisely correct.

the sounds of your mouth or something is quite off putting

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.

@JJustJ-yb9wh

3 жыл бұрын

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

@enochbrown8178

3 жыл бұрын

@@JJustJ-yb9wh Well, it's bogus.

@enochbrown8178

3 жыл бұрын

@@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

3 жыл бұрын

@@enochbrown8178 I can see how that would be better

@enochbrown8178

3 жыл бұрын

@@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.

Bkwas teacher duniya ma koi apka jasa