(i) Upper eyelid: The upper lid of the eye is called upper eyelid. Under it there is a line of eye lashes like hair. It is contagious. It controls the opening and closing of the eyes.
(ii) Inferior eyelid: The lower eyelid is called lower eyelid. Its free end has single eye lashes like hair. It is not contagious. It protects the eyes from dust and sand.
(iii) Nectitating screen: It is the hidden almost passive part. It is located in the inner corner of both eyes. It is a reddish flesh. Through this the lacrimal gland ducts are opened.