Which statement best describes the purpose of lens dose limits in radiology?

• A. To prevent breast cancer
• B. To prevent cataracts
• C. To prevent teratogenic effects
• D. To prevent skin erythema

Answer: (B)

A main idea here is protecting the eye from radiation because the lens is highly radiosensitive and cataract formation is a dose‑dependent, largely irreversible effect. The crystalline lens has a relatively low threshold for damage, and once that threshold is surpassed, opacities can develop and impair vision. Because the lens doesn’t repair itself as readily as some other tissues, occupational exposure limits are set to keep the cumulative dose to the eye below the level at which cataracts begin to form. That's why lens dose limits exist: to prevent radiation-induced cataracts and preserve long-term vision.

In practice, this means taking steps to shield the eyes and minimize exposure when procedures involve X-rays—such as using protective eyewear and maximizing distance or using alternate imaging strategies when possible. The other options describe risks to different tissues (breast tissue, fetal development, skin) that aren’t what the lens dose limit is designed to prevent.