Chapter 19: Lid and Conjunctival Pathology

Blepharitis, a chronic inflammation of the eyelid margins, is categorized anatomically into anterior forms including seborrheic and staphylococcal variants, and posterior forms involving meibomian gland obstruction. Management relies on warm compresses and gentle cleansing, with antibiotics reserved for bacterial infections or severe cases associated with rosacea. Hordeolum and chalazion represent distinct inflammatory responses requiring differentiation: hordeolum is an acute infectious lesion typically caused by Staphylococcus aureus, while chalazion develops as a painless granulomatous nodule from blocked meibomian glands. Both initial treatments emphasize warm compresses and massage, though persistent lesions beyond four weeks warrant ophthalmologic referral to exclude malignancy. Dry eye syndrome results from deficiencies in aqueous, lipid, or mucin components of the tear film, manifesting as burning, foreign body sensation, and photophobia exacerbated by environmental factors and reduced blinking. Treatment follows a tiered approach progressing from artificial tears and environmental modifications through topical immunomodulators and punctal occlusion to specialized contact lenses and surgical options. Epiphora or excessive tearing arises from either tear overproduction or impaired drainage through nasolacrimal pathways, with management targeted at underlying causes such as dry eye, lid laxity, or duct obstruction. Conjunctivitis presents in three primary forms: viral conjunctivitis, the most common presentation with watery discharge and preauricular lymphadenopathy; bacterial conjunctivitis with purulent discharge requiring topical antibiotics; and allergic conjunctivitis characterized by intense itching and mucoid discharge managed with mast cell stabilizers. The chapter emphasizes critical differential diagnoses to exclude vision-threatening conditions including acute glaucoma, uveitis, and corneal pathology, with referral guidelines for patients presenting with significant visual loss, moderate to severe pain, photophobia, or treatment failure.