Lazy eye

Also called Amblyopia

A lazy eye (amblyopia) is when the vision in one eye does not develop properly during childhood. The brain relies more on the stronger eye and ignores the weaker one. It is often caused by a squint or by one eye being more long- or short-sighted than the other. It usually affects one eye.

Last updated Nov 9, 2026

What it is

It is usually picked up by routine eye checks in young children, as the child may not notice.

Treatment works best before the age of 7 and includes glasses, covering the stronger eye with a patch, or eye drops that blur the stronger eye.

Common signs

  • Often no obvious signs
  • An eye that turns in or out
  • Covering one eye or squinting
  • Tilting the head
  • Clumsiness or poor judgement of distance

How it is usually diagnosed

  • Eye tests by an orthoptist or optometrist
  • Examination of the eyes

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Vision test results over time
  • Glasses prescriptions
  • Orthoptist and eye clinic letters
  • Patching schedules

Questions to ask your doctor

  • How many hours a day should my child wear the patch?
  • How long will treatment take?
  • How often do we need check-ups?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • A sudden squint or double vision, or a white reflection in the pupil on photos: get it checked urgently

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources