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| The function of the cornea is |
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Definition
| is to bend light, focusing it on the retina. |
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Term
| The outermost layer of the eye contains the ____________and the ___________. |
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Definition
the white of the eye.
tough outer layer of connective tissue. |
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Definition
the clear outer covering of the anterior portion of the eye.
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Term
| The middle layer of the eye consists of |
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Definition
| the choroid, the iris and the ciliary body. |
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Definition
| a highly pigmented layer of cells beneath the sclera. |
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Definition
| a thin, pigmented diaphragm with two layers of smooth muscle. |
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Definition
| control the size of the pupil and the amount of light that enters the eye. |
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Definition
| a circular, smooth muscle that attaches to the lens by the suspensory ligament. |
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| The function of the ciliary body |
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Definition
| is to control the shape of the lens to focus light on the retina. |
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Term
| Under conditions of dim light, the pupil does what? Why? |
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Definition
| The pupil dilates when radially arranged muscle of the iris contract, allowing more light into the eye. |
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| In bright light, the pupil does what? Why? |
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Definition
| The pupil constricts when circularly arranged muscles of the iris contract, restricting the light that enters the eye. |
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Definition
| The retina is the inner layer of the eye. It contains photoreceptors that detect light and nerve cells that send nerve impulses to the brain. |
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Definition
| watery fluid in the anterior chamber of the eye, nourishes the avascular cornea and lens. |
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Definition
| jelly-like material in the posterior chamber of the eye between the lens and the retina. |
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Definition
| a transparent structure that focuses light on the retina. (The cornea is rough focus; the lens is fine focus.) |
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Definition
| is bending light as it passes from a medium of one density to a medium of a different density. |
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