Amblyopia

Amblyopia ("lazy eye") is reduced vision in one (or rarely both) eyes because the brain ignored its input during childhood. It is usually treatable if caught before about age 7–8; after that window, the vision loss is largely permanent. This is why childhood vision screening matters.

Common causes

• Squint (strabismus) — one eye turns in, out, up, or down; the brain suppresses that eye's image.
• Unequal refractive error — one eye needs much stronger glasses; the brain ignores the blurry one.
• Any early obstacle to vision — congenital cataract, drooping eyelid, corneal scar, severe refractive error.

Detection

• Often no symptoms — children don't know they see poorly, especially if only one eye is affected.
• Squint, tilting head, covering one eye, closing an eye in sunlight.
• Poor school performance, inability to read the board.
• All children should have a formal vision check around age 4, and again before starting school. Indian national and state school-health programmes include this — take part.

Treatment — time-sensitive

• Correct the underlying cause first — glasses for refractive error, surgery for cataract or ptosis, squint surgery or glasses for strabismus.
• Patching the good eye or blurring drops in the good eye force the brain to use the amblyopic eye. Daily hours and duration decided by the eye doctor.
• Treatment works best before age 7; still useful up to about age 10; limited in teenagers; very limited in adults.

Family role

• Patching compliance is the single biggest factor — young children resist it. Make it part of routine (patched during screen/homework time with parental supervision).
• Don't stop early when vision improves — relapse is common; stop only when the eye doctor says so.
• Keep the follow-up checks — amblyopia can recur within a year of stopping treatment.