Cataract formation after radiation exposure typically occurs in which time frame?

• A. Minutes to hours
• B. Days to weeks
• C. Months to years
• D. Immediately

Answer: (C)

Cataract formation from radiation is a late effect that requires a latent period before visible opacities develop. The lens undergoes progressive protein and fiber damage from ionizing radiation, and this damage accumulates over time, so clinically detectable cataracts typically appear months to years after exposure.

Immediate or very early timing (minutes to hours or days to weeks) reflects acute radiation injuries to other tissues, not the lens. There is a dose-related threshold and longer latency with lower doses, but the key idea is that lens opacities emerge long after exposure, making months to years the correct timeframe.