These muscles change the shape of the lens as they relax and contract. Near the front of the eye is the ciliary body, a group of muscles and ligaments that attach to the lens. The middle layer of the eye contains oxygen- and nutrient-rich blood vessels, most of which are located in the layer of tissue called the choroid. The cornea is the transparent portion at the center front part of the eye that allows light through.Ī thin outer mucous membrane called the conjunctiva covers the inside of the eyelids, the cornea, and the front portion of the sclera. It helps maintain the shape of the eye and protects the inner parts.
The sclera is the firm white tissue that covers all of the eye except the very front.
The outside layer of the eye is made up of the sclera and the cornea. Its unique automatic focusing system outstrips that of any camera, and its light sensitivity is ten million times greater than the best film designed so far! Before taking a look at how the eye works, let’s start with a basic overview of how it is built. The human eye is one of the the most complex and sophisticated sensory organs in the body. Read on to find out about the incredible properties of the eye–and how its features affect your vision.
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