A 50-year-old patient complains of difficulty reading small print (Presbyopia). This is caused by:

NCL (MP) Nursing Officer - 2020

Medical & Surgical Nursing

Easy

Appeared in: NCL (MP) Nursing Officer - 2020

Explanation

Presbyopia is an age-related condition where the eye's lens loses its ability to focus on near objects.
This occurs because the lens grows larger, thicker, and less elastic over time, a process linked to the denaturation of lens proteins.
The reduced elasticity impairs accommodation, which is the process of the lens changing shape to increase its refractive power for near vision.
As a result, light from close objects focuses behind the retina, causing blurry near vision.

Option A: An eyeball that is too long causes light from distant objects to focus in front of the retina, not behind it. This condition is myopia (nearsightedness), not presbyopia.
Option C: Clouding of the vitreous humor causes 'floaters'. The condition characterized by clouding that impairs vision is a cataract, which affects the lens, not the vitreous humor. Presbyopia is a focusing issue, not an opacity issue.
Option D: Increased intraocular pressure is the primary cause of glaucoma, a condition that damages the optic nerve and typically leads to loss of peripheral vision, not difficulty with near focus.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Pathophysiology of Presbyopia in acute care settings.
Nurses play a key role in educating patients that presbyopia is a normal and expected part of aging, which can be easily managed with corrective lenses (reading glasses).
It is crucial for nurses to encourage regular comprehensive eye examinations, especially in patients over 40, to differentiate benign presbyopia from more serious, vision-threatening conditions like glaucoma, cataracts, or macular degeneration.
What if? If the 50-year-old patient also complained of seeing halos around lights and a gradual loss of side vision, the primary suspicion would shift from simple presbyopia to glaucoma. The nursing priority would be to facilitate an urgent referral to an ophthalmologist for pressure testing and optic nerve evaluation.

How to Approach the Question

First, identify the key terms in the question: '50-year-old patient', 'difficulty reading small print', and 'Presbyopia'. This points to an age-related vision change affecting near vision.
Recall the basic pathophysiology of common refractive errors. Presbyopia specifically relates to the lens's ability to accommodate.
Evaluate each option against the definition of presbyopia.
Option A, a long eyeball, is the cause of myopia (nearsightedness). Eliminate this.
Option B describes the loss of lens elasticity and accommodation, which is the precise cause of presbyopia. This is a strong candidate.
Option C, clouding of vitreous humor, relates to floaters. Clouding of the lens is a cataract. Neither is the primary cause of presbyopia's focusing problem. Eliminate this.

Concept Tested & Keywords

Concept Tested: Pathophysiology of Presbyopia
Stem keywords: Presbyopia, difficulty reading, small print, 50-year-old
Lead-in keywords: caused by
Clinical cues: The patient's age (50 years) and specific complaint (difficulty reading small print) are classic indicators of presbyopia.

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