Computer-animated model of accommodation - Supplementary video: 25983

Supplementary video of the computer animated model from the original research paper published in Clinical Ophthalmology "Computer-animated model of accommodation and theory of reciprocal zonular action" by Daniel B Goldberg. Read the original research article here: www.dovepress.c...
Abstract: This report presents a computer-animated model of the structures of accommodation based on new understanding of the anatomy of the zonular apparatus integrated with current understanding of the mechanism of accommodation.
Analysis of this model suggests a new, consolidated theory of the mechanism of accommodation including a new theory of reciprocal zonular action. A three-dimensional animated model of the eye in accommodation and disaccommodation was produced in collaboration with an experienced medical animator.
Current understanding of the anatomy of the zonule and the attachments of the vitreous zonule to the anterior hyaloid membrane is incomplete. Recent studies have demonstrated three components of the vitreous zonule:
(1) anterior vitreous zonule (previously "hyalocapsular" zonule), which attaches the ciliary plexus in the valleys of the ciliary processes to the anterior hyaloid membrane in the region medial to the ciliary body and Weiger's ligament;
(2) intermediate vitreous zonule, which attaches the ciliary plexus to the anterior hyaloid peripherally;
and (3) posterior vitreous zonule, which creates a sponge-like ring at the attachment zone that anchors the pars plana zonules.
The pars plana zonules attach posteriorly to the elastic choroid above the ora serrata. Analysis of the computer-animated model demonstrates the synchronized movements of the accommodative structures in accommodation and disaccommodation.
Utilizing model-based reasoning, it is shown that the posterior zonules attach to and provide traction to the anterior vitreous membrane and Weiger's ligament. This model supports the concept that the ciliary body/zonule/anterior hyaloid complex contributes to the changes in the posterior lens capsule during accommodation, supporting an extralenticular component to accommodation and demonstrating an alternative to the "vitreous support" theories.
There is a reciprocal action of the anterior zonules and the posterior zonules. During ciliary body contraction, the anterior zonules lose tension while the posterior zonules stretch and exert force on the posterior lens capsule playing a role in shaping the posterior lens thickness and curvature.
During ciliary body relaxation, the posterior zonules lose tension as the lens flattens and is pulled back by the increasing tension of the anterior zonules.

[@cynthiaouo8219]

watching a 1 min animation is more effective than struggling with the words in the textbook for 1 hour!!! thank u!!

[@sudiptodas0001]

FINALLY an animated video of how the muscles move !
I was wondering how contracting muscles made the Lens Thicker all this time

[@stijndebuf1654]

Same

[@jennipherkafula9467]

Hahahahah same here

[@GeneRauXxX]

I have been struggling with this almost 10 years. Now I understand. Thank you sincerely.

[@emilieklingman6224]

Same! Great video!

[@rin-zo8et]

same haaha

[@kuhataparunks]

EXACTLY what i was looking for, beautiful ultra-high resolution image, very fitting for the subject, thanks so much

[@niloofars9304]

and its for 11 years ago, super immersed

[@OwenVinni]

This is the best explanation of accommodation
Cheers

[@Tostadorarota]

I was having difficulty understanding how the adverse effects of pilocarpine can occur. This helped so much! Thank you!

[@abdu_jilani]

I'm a first year med student ... and I I just wanted to know accommodation ! The more I read the more impressed I get by how there is so much to the eye !!!
Now that u wrote that I gotta go and look what pilocarpine is ..

[@soothingseas]

​@@abdu_jilaniMuscarinic agonist

[@xDomglmao]

Dr. Goldberg deserves standing ovations for this one!

[@jojocool6027]

This is the first time I really understand how it works thank you 🙏

[@stephenhenley5409]

Finally, something that makes sense. Thank you

[@Sestenise]

That's exactly what I was looking for, thanks a lot!

[@chloe12343425]

It's sad how this explains how the eye works better then my GCSE book...

[@Bora82487]

What is Gcse

[@KenDBerryMD]

Great video!

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@Gregory Emmitt instablaster :)

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@Gregory Emmitt You are welcome xD

[@SisiraMaddipati]

but how is that contraction? arent the cilliary muscles moving forward

[@rekhavmenon1507]

That's what confuses me.

[@narvansj5205]

@@rekhavmenon1507same here

[@fresherm3396]

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

[@nunyabusiness6746]

I wonder what happens to all these processes after cataract surgery, because I seem to experience some anomalys
in my peripheral vision when focusing close after surgery in only one eye ?

[@SaneleMagagula]

I found this very helpful. Thanks.

[@carlo4393]

Who else is watching this using their own eyes?

[@KiranSharma-rk7fn]

🙁 I wish I could 🥺
I don't have eyes 😭

[@miami9819]

Oh no I was using my dog's eyes

[@keshavdhakad4936]

Fuck man I am watching this by my eyes, how this is possible
Is it natural or something phenomenon 😮

[@ShrutiSingh-mz3bz]

no i am using my neighbour eye 😊

[@kusumniranjan7838]

You are seeing it with the help of your ass.
I guess.😂

[@Maxumized]

Remember, a long standing, uncorrected hyperope will complain once they are correct with glasses because when they remove their glasses, the lens shape can no longer return to its previous state of full accommodation as easily or not to the same extent…hence, they complain the glasses made their eyes worse…it’s a paradox. Sometimes this may happen in a day or after deep sedation after general surgery for another condition.

[@zacksawyer5767]

now that's a million dollar worth of video!!

[@lulusinev.2760]

thank you, this is great explanation!!

[@MrStalkerhunter]

So it is settled then, this long standing debate between the two hypothesis

[@S-A-S-H-A560]

I had an exam and I wanted to make sure whether the tendons relax first or do the lens shrins ????

[@mehdirostaee2828]

hello i have a question => when we accomodate posterior zonule fibers which connected from posterior portion of lens to ciliary muscles are in tight stete or loose state ... thanks

[@Maxumized]

Tight

[@jojocool6027]

That was really short and helpful 👏🏻

[@sarajade1322]

thank you for such an informative video

[@bgamerjuan_]

Gracias por la magnifica explicación, felicidades

[@katarinadimitrijevic5563]

I finally understand!!! Thank you 🥳🥳

[@veranya2074]

I just have one question.What muscular cilliary job exactly?

[@kuhataparunks]

increases and decreases the thickness of the lens

[@walaanabeel682]

Atropin have duration of action 4hr when place topically on the eye where it's duration last for several day ?why

[@kuhataparunks]

do you mean why does the duration of action last differently by different routes of administration? depending upon the area of action, medications have different effects. An example is inhaled glucocorticoid (fluticasone/flonase) for the lungs versus topical glucocorticoid (cortizone 10), they have different duration of action because different administration route

[@frankinher7467]

is there anyway to strenthen weak suspensory ligaments eye

[@mahuubao]

Excellent ... well done ...

[@ghf212]

very informative ,, the best i have seen

[@nameno831]

very good vid for my understanding eyes accommodation

[@Anime_games-_-XUnknown]

Why is the pupil changing?

[@jacobbryan4875]

Best one on accommodation, thanks

[@gabrielthecolorblindsoul6994]

Thank you!!!!!!!

[@yaaddihani]

Thanks...very good demo

[@binus2689]

Thanks

[@i-m-alien]

what is the thickness of ciliary lens

[@florayang3483]

How to get the full version of this video？

[@dv123abc]

Any idea how someone (42yo) may reverse presbyopia permanently without surgery or corrective eyewear? I'm looking for a solution 🙏🏻

[@Zahraa-kf6wc]

That's what I looking for 🤩

[@Dan-dw3fm]

thank you so much!

[@scienceislife36]

Super explanation

[@nhutranhuynhtrung1092]

thank you, finally i understand it

[@helloballo3957]

Thank you

[@pauvilanovagallartpaulo7597]

Excellent!

[@otiebrown9999]

Thanks!

[@eurovisie2010]

So, and now... Why can't we see close up when we get older.. Is the lens getting stiff... ? So the contraction of the ciliary muscle cannot change the lens making it thicker.. ?
And is needing negative glasses when we grow as a child,.. follow up for not enough relaxing of the muscle anymore. I don't talk about being born with farsight..

[@hamoo1411]

Thanks a lot

[@andrewshabatunichka1785]

Nice 3D model

[@jakeesposito-leftwich9152]

This is that UA-cam MedEd is all about!

[@sara-oi5mx]

Excellent♥

[@seshachary5580]

very nice thank you regards

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[@sujoydutta7421]

Loved it 💝🤘

[@abdumalik_choriyev]

great thanks

[@parkjiminbro7805]

Ciliary muscle contract-lens thicken-ligaments slacken

[@azrieljale]

Anyone else can do this voluntarily?

[@PiyushParmar-yc6zj]

Ty sir

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[@drsaleh63]

Great

[@olaolu10]

Nice

[@qiluo5056]

thx bruh

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[@amdadulhoque7120]

It was good

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best

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👍🏻

[@Maxumized]

Was he speaking English?

[@nilceoliveira9712]

This wasn't made by inteligent life. Wasn't it?

[@علي_داود]

God made it 👍🏻

[@Sachicodao]

Dat lens T H I C C

[@EricDeWildt]

I am not versed in medical terminology and got here out of curiosity in this particular function of the eyes.
Listening to the video was a bit like listening to this one: ua-cam.com/video/aW2LvQUcwqc/v-deo.html

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👌👍

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[@Mybackhandsucks]

very good video for easy understanding.

[@clinchmehard7043]

Thanx ! It srsly took me yrs to understand it 😂! But this vid made it all clear !