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What layer of the eye contains photoreceptors?
The retina contains the cells that sense light (photoreceptors) and the blood vessels that nourish them. The most sensitive part of the retina is a small area called the macula, which has millions of tightly packed photoreceptors (the type called cones).
What are the 4 light bending media of the eye?
The human eye has four refractive media; cornea, vitreous body, lens, and aqueous humor. The cornea is described in the text above, so here we will focus on the lens, vitreous body and aqueous humor.
Which of the following is the bulk of the heavily pigmented vascular layer of the eye?
Diseases of the Eye The choroid is a dense network of blood vessels and pigmented stroma between the retina and the sclera. The choroid supplies nutrition to the posterior layers of the retina.
What contains the ciliary muscle?
The ciliary body is a circular structure that is an extension of the iris, the colored part of the eye. The ciliary body produces the fluid in the eye called aqueous humor. It also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on a near object.
What region of the eye contains the ciliary body?
A part of the middle layer of the wall of the eye. The ciliary body is found behind the iris and includes the ring-shaped muscle that changes the shape of the lens when the eye focuses. It also makes the clear fluid that fills the space between the cornea and the iris.
What part of the eye is composed of tough white opaque fibrous connective tissue?
Most of the outer layer is composed of a tough white fibrous tissue, the sclera. At the front of the eye, however, this opaque outer layer is transformed into the cornea, a specialized transparent tissue that permits light rays to enter the eye.
What is part of uveal tract?
The uveal tract has 3 main parts: (1) the choroid (the tissue layer filled with blood vessels); (2) the ciliary body (the ring of tissue that contains muscles that change the shape of the lens and makes the clear fluid that fills the space between the cornea and the iris; and (3) the iris (the colored part of the eye).
Which part of the retina has the greatest density of photoreceptors providing the best visual acuity?
The foveal center or ‘foveola’ contains the highest density of cone photoreceptors in the retina. Cone photoreceptors function in bright light and support high acuity and color vision.