iris
The lens of the eye also called the crystalline lens.
The ciliary muscle is responsible for eye accommodation for near and far vision. It accomplishes this task by changing the shape of the lens.
The most neuron focused point in the eye is the fovea centralis or more simply, fovea. This is the are most responsible for sharp central vision. About 50% of the optic nerve endings are from the brina to this area in the eye.
The eye accommodates for close vision by tightening the ciliary muscles, allowing the lens to become more rounded. The opposite is true for distance vision.
There is no cure for tunnel vision or peripheral vision loss. Peripheral vision loss can be treated with the use of a lens called prism that is added to a eyeglass prescription.
The lens of the eye also called the crystalline lens.
As people age, the lens hardens and changes shape less easily.
Muscles in the eye surrounding the lens contract stretching it out, flattening it; or relax, letting it thicken. These changes in shape refocus the lens.
the cornea protects and shapes the eyeball
If the cataract remains small or at the periphery of the lens, the visual changes may be minor.
The ciliary muscle, part of the retina of the eye, changes the focal length of the lens by flattening it or making it more spherical.
Cataracts
The ciliary muscle is responsible for eye accommodation for near and far vision. It accomplishes this task by changing the shape of the lens.
Then the person wouldn't be able to see very well.
When the lens is slowly lifted up from the glass plate the vision of the viewer changes. This is due to readjustment of the retina present in our eyes.
High blood sugar levels can cause shape changes in the lens of the eye
sphere, standard lens shape (convex or concave) to correct focuscylinder, cylinder shape (both magnitude and angle) to correct astigmatismprism, wedge shape (very rare) to correct the direction the eye is looking (sometimes used to compensate for double vision)