Canadian Practical Nurse Registration Examination (CPNRE) Practice Exam 2025 - Free CPNRE Practice Questions and Study Guide

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What is the primary cause of cataracts?

Injury to the eye

Thickening of the lens due to age

The primary cause of cataracts is thickening of the lens due to age, which is a common physiological change that occurs as people grow older. With advancing age, the proteins in the lens of the eye can start to clump together, causing it to become cloudy. This cloudiness interferes with the passage of light, leading to symptoms such as blurred vision, difficulty seeing at night, and sensitivity to glare.

While factors like eye injury, genetic disorders, and high blood pressure can contribute to the development of cataracts, they are not the primary causes. Injury to the eye may lead to secondary cataracts, and certain genetic predispositions can increase the risk, but the most significant and widely recognized cause remains age-related changes in the lens structure.

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Genetic disorder

High blood pressure

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