- #1
mishrashubham
- 599
- 1
Ok, I know that the human eye lens adjusts its focal length depending on the object distance to obtain a sharp image on the retina because the image distance has to remain constant. What I am not able to understand is how do the ciliary muscles and the suspensory ligaments contract in order change the shape of the lens. What exactly is the mechanism by which muscles and the ligaments work?
What type of muscle is the ciliary muscle? Wikipedia confuses me with
and then saying
In what pattern are the muscle fibers arranged? (Radial, concentric, or some other complex structure)
The dilemma is that muscles are supposed to provide a force by contracting i.e. becoming smaller in size(Am I right?). But in a textbook I saw a diagram where the ring of muscles is expanding its width and exerting an inwards force on the lens (which does not look like contracting).
Also is the eye lens elastic i.e. is it constantly applying an inward elastic force on the ciliary muscles?
Thank You
What type of muscle is the ciliary muscle? Wikipedia confuses me with
The ciliary muscle (pronounced /ˈsɪli.ɛəri/) is a ring of striated smooth muscle in the eye's middle layer (vascular layer) that controls accommodation...
and then saying
Smooth muscle is an involuntary non-striated muscle...
In what pattern are the muscle fibers arranged? (Radial, concentric, or some other complex structure)
The dilemma is that muscles are supposed to provide a force by contracting i.e. becoming smaller in size(Am I right?). But in a textbook I saw a diagram where the ring of muscles is expanding its width and exerting an inwards force on the lens (which does not look like contracting).
Also is the eye lens elastic i.e. is it constantly applying an inward elastic force on the ciliary muscles?
Thank You