31 Comments on “Eye Accommodation Made Easy”

  1. Ciliary muscles don't contract in that way; instead they contact in such a way that causes the sclera to change its shape, this allows the lens to increase its curvature. This is the reason why looking at things at a close proximity causes strain on the eye, as the sclera is being forced to change its shape.

  2. Finished off my anatomy without ever understanding how the suspensory ligaments really were loosened when ciliary body constricts, always had trouble with understanding how. I was always thinking in a too 2-d organization, but as soon as you did the gesture with your hands at 2:54 it became so obvious to me. Priceless, wonderful feeling, thank you so much! πŸ˜€

  3. OMG, you are a life savor. I'm a psych major and I have a Sensation & Perception Exam tomorrow morning and I just could not understand how the the relaxed ciliary muscle in turn forces the suspended fibers "zonules zinn" to become stretched causing the lens to remain flat allowing the eye to be focused on distant objects. However, when the lens needs to accommodate to focus on closer objects the ciliary muscle contracts, reducing the tension on the "zonules zinn", enabling the lens to bulge or become round. By depicting the eye from a different anatomical direction I was able to better understand the exact motion of the ciliary muscle as it contracts. It's important to fixate on the idea that when the ciliary muscle contracts it actually grows smaller essentially trying to suffocate the lens almost. As a result the suspended muscles of the "zonules zinn", who were once stretched to maximum potential which were pulling the lens to a flat state now loosens it's tension providing the lens to take on a more convex shape allowing it to adjust its refractive power to fixate on the closer object allowing it to stay focused on the fovea. Wow, the power of the internet…why even go to class.
    P.s. I guess Sensation & Perception does make the world go round!! Lol. God Bless:)

  4. I have minor prescription. If I don't wear glasses and look at something blurry, would that put a strain on my eyes if I don't try to see and still relax my eyes? Like would my eyes subconsciously try to see and strain my eyes, causing my prescription to increase?

  5. I just had an eye test done and my Convergence is 8cm and my Accommodation is 15cm. Unless I misunderstand Convergence, this means objects become double when they reach 8cm from my eyes. But how was my Accommodation measured in centimetres?

  6. This was the sixth video I watched. Β That was the best explanation I needed. Β Three years of med school and I always forget how that works. Β And thanks to horrible explanations, usually takes me thirty minutes to re figure it out. Β You just saved me 20 minutes.Β 

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