Conjunctivitis; Adrenal Cortex Hormones/administration & dosage; Adrenal Cortex Hormones/therapeutic use; Adult; Anti-Bacterial Agents/administration & dosage; Anti-Bacterial Agents/therapeutic use; Anti-Inflammatory Agents, Non-Steroidal/administration & dosage; Anti-Inflammatory Agents, Non-Steroidal/therapeutic use; Conjunctivitis/complications; Conjunctivitis/diagnosis; Conjunctivitis/etiology; Conjunctivitis, Allergic/diagnosis; Conjunctivitis, Allergic/drug therapy; Conjunctivitis, Allergic/etiology; Conjunctivitis, Bacterial/diagnosis; Conjunctivitis, Bacterial/drug therapy; Conjunctivitis, Viral/diagnosis; Conjunctivitis, Viral/prevention & control; Diagnosis, Differential; Ectropion/diagnosis; Fluorescent Antibody Technique; Histamine Antagonists/administration & dosage; Histamine Antagonists/therapeutic use; Humans; Immune System Diseases/complications; Keratoconjunctivitis/diagnosis; Keratoconjunctivitis Sicca/diagnosis; Keratoconjunctivitis Sicca/etiology; Keratoconjunctivitis Sicca/therapy; Medical History Taking; Ophthalmic Solutions; Pemphigoid, Bullous/diagnosis; Pemphigoid, Bullous/therapy; Rosacea/diagnosis; Rosacea/drug therapy; Seasons; Trachoma/diagnosis; Trachoma/drug therapy