Amblyopia, also called lazy eye, is a disorder of sight in which the brain fails to fully process input from one eye and over time favors the other eye. It results in decreased vision in an eye that typically appears normal in other aspects. Amblyopia is the most common cause of decreased vision in a single eye among children and younger adults.

मंददृष्टि (Amblyopia) ऐसा विकार है जिसमें यद्यपि बाहर से नेत्र पूर्णत: स्वस्थ दिखाई देते हैं, परंतु वस्तुत: उनमें किसी भी चीज को स्पष्ट देखने की क्षमता नहीं रहती।