Learning Objectives: Learn the coats of eyeball:structure and function Learn the contents of eyeball:structure,function; Learn the circulation of aqueous humor Understand the lacrimal apparatus Know eyelid Know extraocular muscles and eye movement; Know the distribution of retinal blood vessel. Learning Objectives: Learn the coats of eyeball: structure and function Learn the contents of eyeball: structure, function; Learn the circulation of aqueous humor Understand the lacrimal apparatus Know eyelid Know extraocular muscles and eye movement; Know the distribution of retinal blood vessel