The eye defect cause by the development of cloudy areas in the lenses is?

Step 1: Analyze the question The question asks which eye defect is caused by cloudy areas developing in the lens of the eye.

Step 2: Explain the concept The lens is normally transparent so that light can pass through and focus on the retina. When parts of the lens become opaque (cloudy), light cannot pass through properly, and vision becomes blurred or dim.

Step 3: Examine each option

• A. Presbyopia: Loss of elasticity of the lens with age. The lens cannot change shape well, so the person has difficulty focusing on near objects. The lens stays clear.
• B. Glaucoma: Increased pressure inside the eyeball (from a buildup of aqueous humour) that damages the optic nerve. It is not a clouding of the lens.
• C. Cataract: Development of cloudy or opaque areas in the lens, leading to blurred vision and, if untreated, blindness. This matches the question exactly.
• D. Astigmatism: Uneven curvature of the cornea or lens, so light focuses at different points and images look distorted. The lens is not cloudy.

Step 4: Answer The correct option is C. cataract. It is treated by surgically replacing the clouded lens with an artificial one.

Step 5: Exam tip Link the word to its meaning: a cataract is like a waterfall, and a cloudy, "foggy" window blocks your view. Cataract = Cloudy lens. Also remember: Glaucoma = Gauge (pressure) in the eyeball.