MP NHM CHO-2024 (Shif…: \ \ \ \ is the leading cause for blindness worldwide.

MP NHM CHO-2024 (Shift-1)

Medical & Surgical Nursing

Easy

Appeared in: MP NHM CHO-2024 (Shift-1)

Explanation

Cataract is a clouding of the lens in the eye which leads to a decrease in vision.
It is the most common cause of blindness worldwide, particularly in developing countries where access to surgery is limited.
The primary cause of cataracts is aging, although they can also be caused by trauma, radiation exposure, and certain diseases like diabetes.
The main symptom is painless, progressive, and blurry vision.
Treatment involves surgically removing the cloudy lens and replacing it with an artificial one, which is a highly effective procedure.

Option A: Hypothyroidism (underactive thyroid) is an endocrine disorder. While severe, untreated hypothyroidism can lead to myxedema which may cause periorbital swelling, it is not a direct cause of blindness.
Option C: Hyperthyroidism (overactive thyroid) can lead to Graves' ophthalmopathy, which involves bulging eyes (exophthalmos). In severe cases, this can stretch the optic nerve or cause corneal ulceration, potentially leading to blindness, but it is not as common as cataracts.
Option D: Dementia is a neurocognitive disorder affecting memory, thinking, and social abilities. It does not directly cause ocular blindness.

Visual 1: Diagram - A side-by-side comparison of a normal, clear eye lens and an eye with a cataractous, cloudy lens. This helps visualize the pathology.
Visual 2: Infographic - A world map highlighting the prevalence of blindness due to cataracts, emphasizing its status as a global health issue.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Leading causes of blindness as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in identifying patients at risk for cataracts, educating them about symptoms (like painless blurry vision, glare), and preparing them for surgery.
Post-operative nursing care for cataract surgery includes administering eye drops, teaching the patient how to protect the eye (e.g., using an eye shield), and monitoring for complications like infection or increased intraocular pressure.
What if the patient is a diabetic? The nurse must emphasize the importance of tight glycemic control before and after surgery, as high blood sugar can increase the risk of post-operative complications like infection and delayed healing.

How to Approach the Question

First, identify the core of the question: it asks for the 'leading cause' of 'blindness worldwide'. This is a factual recall question.
Scan the options: Hypothyroidism, Cataract, Hyperthyroidism, Dementia.
Evaluate each option based on general medical knowledge. Hypothyroidism and hyperthyroidism are endocrine disorders; while they can have eye-related symptoms, they are not known as the primary cause of global blindness.
Dementia is a brain disorder, not an eye disorder.
Cataract is a well-known eye condition involving the clouding of the lens. Recall or deduce that this is a very common age-related condition and a major cause of treatable blindness.
Select Cataract as the most plausible and factually correct answer.

Concept Tested & Keywords

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Lewis Medical Surgical Nursing p. 432-441