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Some of the terms described in this section are specific to ophthalmology, and others have special usage requirements in ophthalmology. See also , Correct and Preferred Usage of Common Words and Phrases. adnexa oculi Although often used as a synonym for eyelids, the term adnexa oculi (which is plural) properly includes the eyelids, lacrimal apparatus, and other appendages of the eye and should be used with its inclusive meaning. diopter The diopter is a measure of the power of an optical lens and is the reciprocal of the focal length in meters. Diopter is abbreviated D when used with a Less