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Lazy eye

A lazy eye, also called amblyopia, means vision in one eye does not develop properly, even though the eye itself may look almost normal. This mainly happens during childhood, while the brain is still learning to process images. Early recognition and consistent treatment matter because recovery is more likely while vision is developing. Causes may include a squint, different focusing strengths between the eyes or blocked vision. Call immediately for a new white pupil, sudden new squint, drooping eyelid, sudden vision loss or a child suddenly looking at things differently.

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  • Lazy eye is a problem with visual development, usually in early childhood.
  • It often results from a squint, different focusing strengths between the eyes or blocked vision.
  • Earlier detection gives treatment a greater chance of helping.
  • Glasses, patching or other treatment work well only when followed consistently.
  • A new squint, white pupil, drooping eyelid or sudden reduction in vision needs prompt assessment.

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Further reading

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Reduced vision in childrenA child may see less well because of a focusing error, a lazy eye, a squint or an eye disease. Early checks matter because young brains are still learning to see. A white pupil, sudden sight loss, a painful red eye or serious eye injury is a warning sign.
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Squint in childrenWith a squint, the eyes do not always look at the same point. One eye may turn inwards, outwards, upwards or downwards. Early assessment matters because the brain can suppress the image from one eye, leading to a lazy eye and permanently reduced vision.
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Visual impairment and blindnessLow vision means sight remains limited even with ordinary glasses or treatment; blindness has different degrees. Causes and options vary greatly. Sudden loss of sight, a dark curtain, a painful red eye or loss of neurological function needs immediate assessment.