Which term is not among the eye-related terms described in the material?

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The main idea here is distinguishing terms that describe external parts of the eye from those that refer to internal structures. In many introductory eye-anatomy materials used for orientation and mobility, terms like orbit, sclera, and conjunctiva are covered because they describe the visible or protective aspects of the eye’s surface and its immediate surroundings. The orbit is the eye socket that houses the eye, the sclera is the white outer coating, and the conjunctiva is the membrane lining the eyelids and the visible surface of the eye. The retina, however, is the inner sensory layer at the back of the eye that detects light and begins the process of vision. It’s a deeper, neural component and isn’t typically included in the basic set of external eye terms described in that material. Therefore, retina is the term that isn’t described in that context.