What is role strain in sociology? A: Role strain in sociology is when a particular role a person needs to fulfill is strained due to excessive obligations or multiple demands on time, energy or available resources.
Short posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera at the edge of the optic nerve; they supply the choroid and the rods and cones of the retina. Long posterior ciliary arteries: Branch from the ophthalmic artery and pierce the sclera to supply the ciliary body and iris.
The ciliary muscle is a ring of smooth fibers that is located in the ciliary body (the structure in the eye that secretes aqueous humor) just behind the iris. Its primary responsibility consists of changing the shape of the eye lens in order to accommodate for distance vision or near vision.