This document provides an overview of eyelid anatomy and diseases. It describes the layers of the eyelid from anterior to posterior as skin, subcutaneous tissue, orbicularis oculi muscle, submuscular tissue, tarsal plate containing Meibomian glands, and conjunctiva. It discusses common eyelid diseases like blepharitis, hordeolum, chalazion, and trichiasis. Treatment options include warm compresses, lid scrubs, antibiotics, incision and drainage, cryotherapy, electrolysis, and mucous membrane grafting depending on the specific disease.