The critical period for amblyopia treatment (occlusion therapy) extends up to which age, and what is the MOST critical window for maximum neural plasticity?

• A Critical period up to 7 years; most critical period 0–2 years
• B Critical period up to 5 years only; no benefit after 5 years
• C Critical period extends throughout childhood to 18 years uniformly
• D Critical period up to 10 years; most critical period 2–5 years ✓

Explanation

The critical period for visual cortex plasticity and amblyopia treatment extends to approximately 7–10 years of age, with the sensitive period being most intense between 2–5 years. Treatment initiated earlier yields better and faster visual gains due to maximal cortical plasticity, but treatment after age 7 still produces improvement (though less dramatic) — the PEDIG studies showed patching can benefit children up to at least 7–10 years. Persistent severe amblyopia may show some response even in adolescents, challenging the strict 7-year cutoff. Beyond 10 years, recovery becomes increasingly difficult.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

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