Accommodation reflex (and convergence) neuroanatomy

The accommodation reflex describes the response of the eye to viewing a near object by thickening the lens for focusing, convergence of the eyes (adduction of the pupils) and constriction of the pupils. What is the neuroanatomy of this reflex and why is it useful to test?
Music:
Under the Tide by Gregory David
www.epidemicsound.com/track/U...

[@joeforsh0]

I'm not a student, my job has nothing to do with anatomy, I just like this! I'm reminded somewhat of watching Bill Nye as a kid. These videos are just good educational content.

[@sarahaidari5454]

From deep of my heart thank u so much it is really helpful for me🎉❤❤

[@DaRyteJuan]

Sam, you are just amazing.

[@PikesCore24]

Could you cover Speed Apnea please? I recently noticed as I was falling asleep that i heard myself snoring. It is a new thing, and it only lasted an instant, but it woke me up. My dentist once looked down my throat and told me I had a small breathing space; there is probably a more technical term for it. I just what anatomical parts are at play here. Also, I don't know if this is significant, but I carry a lot of tension in my jaw. Finally, one more data point: I am not overweight.

[@quicknumbercrunch8691]

Good explanation. Thank you. I wonder how cataract surgery detaches and attaches the artificial lens to the ciliary muscles.

[@andreypiskov_legacy]

They do not. With multifocal lens you can have 2-3 fixed focus distances but never the same continuous focus at any distance as with human lenses

[@quicknumbercrunch8691]

@@andreypiskov_legacy Thank you. Is the lens attached with sutures or glue? One would then need glasses for some distances, but not others?

[@andreypiskov_legacy]

⁠​⁠@@quicknumbercrunch8691it’s just expanded inside the “bag” - just look for intraocular lens

[@snaithmd1]

No, and intraocular lens is not attached with the glue sutures. The natural lens inside the eye actually sits in a little transparent bag called the capsule.When a surgeon performs a cataract surgery, the eyes Is dilated, and the front of the capsule is ripped open in a circular fashion called a capsule a Rexis. The old lens is then emulsified and sucked out. The new lens is then inplanted inside the capsule bag with the front still open. Over the next six weeks, the capsule Effectively shrink wrapped down onto the lens implant and you get your final focus. Within the first few weeks, the lens can move forward or backwards slightly. So it's not advisable to get your eyes, tested for a final pair of glasses, until the capsule has settled down and is rested in its final place

[@quicknumbercrunch8691]

@@snaithmd1 Thank you for taking the time to give a stranger a great explanation. I enjoyed learning about the surgery, plus I will probably have the surgery before long, so it comforting to know what will happen. In case the doctor falls unconscious to the ground, I can finish the work myself. I will need several mirrors. Cheers.

[@432hzPopMusic]

Thank you! Can you talk about strabismus sometime?

[@Dom4z]

Hey, Sam I have a question. So, sitting infront of PC. Eyes converge towards the screen, the lens fattens to accomodate with "+"plus power and pupils constrict. What happens if you spend 8+ hours everyday infront of PC as adult? Does this lead to the eye elongating to compensate? Or does the ciliary body and lens get stuck in accomodation? Do you become permanently myopic?