Which are the three layers of the wall of the eye?

Which are the three layers of the wall of the eye?

• A. Cornea, sclera, and retina.
• B. Retina, sclera, and vitreous.
• C. Sclera, choroid, and retina.
• D. Iris, choroid, and retina.

Answer: (C)

The wall of the eye is organized into three concentric tunics: an outer fibrous layer, a middle vascular layer, and an inner neural layer. The outer layer is mainly the sclera, which forms most of the white of the eye, provides shape, and anchors the eye muscles. The middle layer is the choroid, part of the vascular (uveal) tract that supplies blood to the retina and contains pigmented tissue to reduce light scatter. The inner layer is the retina, the neural tissue that contains photoreceptors to detect light and begin processing visual information. While the cornea and iris are important structures, the classic three-layer description of the wall emphasizes sclera, choroid, and retina.

The wall of the eye is organized into three concentric tunics: an outer fibrous layer, a middle vascular layer, and an inner neural layer. The outer layer is mainly the sclera, which forms most of the white of the eye, provides shape, and anchors the eye muscles. The middle layer is the choroid, part of the vascular (uveal) tract that supplies blood to the retina and contains pigmented tissue to reduce light scatter. The inner layer is the retina, the neural tissue that contains photoreceptors to detect light and begin processing visual information. While the cornea and iris are important structures, the classic three-layer description of the wall emphasizes sclera, choroid, and retina.