NCLEX Review Guide: Adult Health - Visual & Auditory Impairments

Legal Blindness Definition & Classifications

• Legal blindness is defined as visual acuity of 20/200 or worse in the better eye with correction, or visual field of 20 degrees or less. This classification determines eligibility for government services and disability benefits.
• Total blindness means complete absence of light perception, while functional blindness allows some light/shadow perception but insufficient vision for daily activities.
• Visual impairment categories include mild (20/30-20/60), moderate (20/70-20/160), severe (20/200-20/400), and profound (20/500-no light perception).

Common Causes of Visual Impairment in Adults

• Diabetic retinopathy is the leading cause of blindness in working-age adults, caused by chronic hyperglycemia damaging retinal blood vessels. Regular dilated eye exams are crucial for early detection.
• Glaucoma causes gradual peripheral vision loss due to increased intraocular pressure damaging the optic nerve. Often called "silent thief of sight" because symptoms appear late.
• Age-related macular degeneration (AMD) affects central vision, making reading and detailed work difficult while peripheral vision remains intact.
• Cataracts cause cloudy, blurred vision that typically develops gradually and can be surgically corrected with lens replacement.

Nursing Interventions for Visually Impaired Patients

1. Always announce yourself when entering the room and explain what you're doing to reduce anxiety and promote safety.
2. Use the "clock method" to describe food placement: "Your chicken is at 6 o'clock, vegetables at 3 o'clock."
3. Keep the environment consistent - don't rearrange furniture or personal items without informing the patient.
4. Offer your arm for guidance rather than grabbing the patient's arm, allowing them to maintain control and dignity.
5. Speak in a normal tone - visual impairment doesn't affect hearing ability.

Types of Hearing Loss

• Conductive hearing loss occurs when sound waves cannot reach the inner ear due to problems in the outer or middle ear. Causes include earwax impaction, otitis media, or damaged ossicles.
• Sensorineural hearing loss results from damage to the inner ear or auditory nerve, often permanent and may benefit from hearing aids or cochlear implants.
• Mixed hearing loss combines both conductive and sensorineural components, requiring comprehensive evaluation and treatment approach.
• Presbycusis is age-related hearing loss affecting high-frequency sounds first, making it difficult to understand speech in noisy environments.

Communication Strategies for Hearing Impaired Patients

1. Face the patient directly and ensure good lighting on your face for lip reading.
2. Speak clearly at normal volume - shouting distorts speech and may be uncomfortable for hearing aid users.
3. Use gestures, writing, or visual aids to supplement verbal communication.
4. Reduce background noise when possible - turn off TV, close doors to minimize distractions.
5. Confirm understanding by asking patient to repeat back important information.