SECTION 20
Eye Disorders
Structure and Function 
Muscles, Nerves, and Blood Vessels Protective Features Effects of Aging
219 Symptoms and Diagnosis of Eye Disorders
Blunt Injuries to the Eye Fractures of the Orbit Lacerated Eyeball Eyelid Lacerations Corneal Abrasions and Foreign Bodies Chemical Burns to the Eye Traumatic Iritis and Chemical Iritis
222 Eyelid and Tearing Disorders
Blepharitis Canaliculitis Chalazion Dacryocystitis Dacryostenosis Entropion and Ectropion Eyelid Tumors Stye Trichiasis
223 Conjunctival and Scleral Disorders
Infectious Conjunctivitis Trachoma Allergic Conjunctivitis Episcleritis Scleritis Noncancerous Growths
Superficial Punctate Keratitis Corneal Ulcer Keratoconjunctivitis Sicca Keratomalacia Herpes Simplex Keratitis Herpes Zoster Ophthalmicus Peripheral Ulcerative Keratitis Keratoconus Bullous Keratopathy
Age-Related Macular Degeneration Epiretinal Membrane Detachment of the Retina Retinitis Pigmentosa Blockage of Central Retinal Arteries and Veins Hypertensive Retinopathy Diabetic Retinopathy Endophthalmitis Cancers Affecting the Retina
Papilledema Optic Neuritis Ischemic Optic Neuropathy Toxic Amblyopia
Infections of the Orbit Inflammation of the Orbit Tumors of the Orbit Proptosis