Chapter 53: The Eye and the Ear

The vision section begins with detailed eye anatomy, including the cornea, lens, retina, macula, optic disc, and mechanisms governing aqueous humor production and intraocular pressure regulation. Assessment techniques such as tonometry for pressure measurement, slit lamp biomicroscopy, fluorescein angiography, and imaging modalities enable nurses to evaluate ocular health systematically. Major vision disorders covered include cataracts characterized by lens opacity and managed through phacoemulsification with postoperative care protocols, glaucoma involving elevated intraocular pressure managed pharmacologically with miotics and beta-blockers or surgically via trabeculectomy, retinal detachment presenting with visual field defects requiring urgent surgical reattachment, age-related macular degeneration affecting central vision with distinction between dry and wet forms, and ocular melanoma treated through enucleation or plaque radiotherapy. Emergency eye care addresses chemical burns requiring immediate irrigation, foreign body removal, hyphema management, and penetrating trauma stabilization. Corneal transplantation requires careful donor-recipient matching and monitoring for rejection indicators. The auditory section examines the cochlea, ossicles, tympanic membrane, vestibular apparatus, and cranial nerve involvement in hearing and balance. Hearing loss classification includes conductive loss from middle ear pathology, sensorineural loss from inner ear or neural damage including presbycusis, and mixed presentations. Specific disorders include otitis media and externa with inflammatory responses, mastoiditis requiring surgical intervention, otosclerosis managed through stapedectomy, Ménière's disease involving vertigo and fluid imbalance treated with vestibular rehabilitation and dietary modification, and acoustic neuromas requiring neurosurgical consideration. Diagnostic procedures encompass audiometry, electronystagmography, and imaging studies. Interventions range from hearing aids and cochlear implants to surgical procedures including myringotomy, tympanoplasty, and mastoidectomy, with emphasis on safety, patient education, and postoperative management.