{"id":19110,"date":"2022-05-06T01:06:22","date_gmt":"2022-05-06T01:06:22","guid":{"rendered":"https:\/\/www.knowlative.com\/?p=19110"},"modified":"2022-05-06T01:06:22","modified_gmt":"2022-05-06T01:06:22","slug":"intrinsic-eye-muscles","status":"publish","type":"post","link":"https:\/\/www.knowlative.com\/ru\/intrinsic-eye-muscles\/","title":{"rendered":"Intrinsic Eye Muscles"},"content":{"rendered":"
The intrinsic muscles of the eye control two important functions: <\/p>\n
Circular and radial muscles of the iris, named Iris Sphincter Muscle and Iris Dilator Muscle respectively, control how much light enters the eye. <\/p>\n
Effect of light on the pupil: <\/p>\n
The function of the lens is to focus an image on the retina. Depending on whether light rays are coming from an object seen up close (more bending of light required) or far away (less bending required), the lens changes shape to allow for this clear focus. The lens of the eye is an elastic biconvex structure made of crystalline protein.
\n The lens in a more spherical shape (more convex) will cause more bending of light and the lens in a more flattened state (less convex) will cause less bending of light.
\n The Ciliary Muscle of the eye control the shape of the lens-relaxation of the ciliary muscles will cause more tension in the suspensory ligaments to cause the lens to be more flat. Contraction of the ciliary muscles will release the tension on suspensory ligaments allowing the lens to return to its resting spherical shape.
\n Ciliary muscles are innervated by both parasympathetic and sympathetic fibers. Activation of beta 2 receptors expressed on ciliary muscles cause relaxation for far vision, while muscarinic receptors mediate contraction for near vision. <\/p>\n
<\/p>\n