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Eye (tissue) donation | 마이메르시 MyMerci
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Eye (tissue) donation

NCLEX Review Guide: Adult Health - Visual/Auditory Systems & Eye Tissue Donation

Visual System Assessment & Disorders

Common Visual Disorders

  • Glaucoma: Increased intraocular pressure causing optic nerve damage, leading to peripheral vision loss first. Silent thief of sight - often asymptomatic until advanced stages.
  • Cataracts: Clouding of the lens causing decreased visual acuity, glare sensitivity, and halos around lights. Most common cause is aging.
  • Macular Degeneration: Deterioration of the macula causing central vision loss while peripheral vision remains intact.
  • Diabetic Retinopathy: Vascular changes in retina due to chronic hyperglycemia, leading to hemorrhages and potential blindness.

Memory Aid: GLAUCOMA

Gradual vision loss
Loss of peripheral vision
Acute angle-closure emergency
Undetected until advanced
Chronic open-angle most common
Ocular pressure elevated
Medications: miotics, beta-blockers
Aging primary risk factor

Key Points

  • Acute angle-closure glaucoma is a medical emergency requiring immediate intervention
  • Regular eye exams after age 40 are crucial for early detection
  • Diabetic clients need annual dilated eye exams

Auditory System Assessment & Disorders

Hearing Loss Types

  • Conductive Hearing Loss: Problem with outer or middle ear preventing sound waves from reaching inner ear. Often reversible with medical/surgical treatment.
  • Sensorineural Hearing Loss: Damage to inner ear or auditory nerve, typically permanent and managed with hearing aids or cochlear implants.
  • Mixed Hearing Loss: Combination of both conductive and sensorineural components requiring comprehensive treatment approach.

Weber vs Rinne Test Comparison

TestNormal ResultConductive LossSensorineural Loss
WeberSound heard equallyLateralizes to affected earLateralizes to unaffected ear
RinneAir > Bone conductionBone > Air conductionAir > Bone (but both reduced)

Key Points

  • Ototoxic medications include aminoglycosides, loop diuretics, and aspirin
  • Sudden sensorineural hearing loss requires immediate medical attention

Eye Tissue Donation

Corneal Donation Process

  • Timing: Corneal tissue must be harvested within 6-12 hours after death to maintain viability for transplantation.
  • Eligibility: Most individuals can donate corneal tissue regardless of age, with few medical contraindications compared to organ donation.
  • Contraindications: Active infections, certain cancers affecting the eye, and some communicable diseases may prevent donation.

    Donation Process Steps

  1. Family consent obtained (unless donor registry indicates consent)
  2. Medical history review and screening completed
  3. Tissue recovery performed in sterile environment
  4. Corneal tissue preserved and tested for quality
  5. Matching with appropriate recipient based on medical criteria

Clinical Scenario

A 45-year-old patient dies from cardiac arrest. The family asks about eye donation. The nurse should contact the organ procurement organization immediately as time is critical for tissue viability.

Key Points

  • One donor can restore sight to two recipients through corneal transplantation
  • Eye donation does not interfere with open-casket funeral arrangements
  • Age limits are more flexible for tissue donation compared to organ donation

Commonly Confused Concepts

Glaucoma vs Cataracts

AspectGlaucomaCataracts
Vision Loss PatternPeripheral firstCentral and overall
PainUsually painless (except acute)Painless
ReversibilityIrreversibleReversible with surgery
Primary TreatmentMedications/surgery to lower IOPSurgical lens replacement

Quick Check: Eye Donation Facts

  • ☐ Corneal donation can occur up to 12 hours after death
  • ☐ Age is rarely a limiting factor for corneal donation
  • ☐ One donor can help two recipients
  • ☐ Previous eye surgery doesn't automatically disqualify donation

Study Tips & Memory Aids

VISION Memory Aid for Eye Assessment

Visual acuity testing
Intraocular pressure measurement
Symptom assessment (pain, discharge, vision changes)
Inspection of external structures
Ophthalmoscopic examination
Neurological assessment (pupils, extraocular movements)

Common Pitfalls

  • Don't confuse acute angle-closure glaucoma (emergency) with chronic open-angle glaucoma (gradual)
  • Remember that macular degeneration affects central vision, not peripheral
  • Eye tissue donation has different timeframes than organ donation

Self-Assessment Checklist

  • ☐ Can differentiate between types of glaucoma and their treatments
  • ☐ Understands the difference between conductive and sensorineural hearing loss
  • ☐ Knows the timeline and process for corneal donation
  • ☐ Can interpret Weber and Rinne test results
  • ☐ Recognizes ototoxic medications

Remember: You're preparing to be a safe, competent nurse who can make a real difference in patients' lives. Every concept you master brings you closer to that goal. Stay focused, stay positive, and trust in your preparation!

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