Amblyopia, commonly called “lazy eye”, is one of the most important eye conditions to detect early in children. It affects approximately 2–3% of Australian children and is the leading cause of preventable vision loss in people under 40. The good news: when detected early, it is highly treatable.
What Is Amblyopia?
Amblyopia occurs when one eye fails to develop normal vision during childhood, even when there is no structural problem with the eye itself. The brain essentially “switches off” the weaker eye, preferring input from the stronger one. Over time, the visual pathways from the weaker eye become underdeveloped, and the reduced vision becomes permanent if not treated before age 7–8.
Critically, a child with amblyopia will usually pass a school vision screening — because they use their good eye to read the chart. Only a full binocular vision assessment, as performed during a comprehensive eye test, will detect it.
What Causes Lazy Eye?
- Strabismus (eye turn) — when one eye points in a different direction, the brain suppresses its image to avoid double vision
- Anisometropia — a significant difference in prescription between the two eyes; the brain prefers the clearer eye
- Deprivation amblyopia — caused by a physical obstruction like a cataract or droopy eyelid blocking vision in one eye
Signs That May Indicate Amblyopia
- One eye appearing to turn in, out, up, or down
- Tilting or turning the head to favour one eye
- Squinting or closing one eye in bright light
- Poor depth perception (difficulty with stairs, catching balls)
- Difficulty reading despite seeming to have “fine” vision
Treatment Options
Treatment for amblyopia focuses on forcing the brain to use the weaker eye. The most common approaches include:
- Glasses — often the first step; correcting the underlying refractive error allows the brain to receive a clearer image from the weaker eye
- Occlusion therapy (patching) — patching the stronger eye for a prescribed number of hours daily to encourage the brain to use the weaker eye
- Atropine drops — blurring the stronger eye temporarily as an alternative to patching
- Vision therapy — targeted exercises to improve the brain-eye connection
The earlier treatment begins, the better the outcome. After age 8–10, the visual system is largely fixed and treatment becomes much less effective. This is why we strongly recommend eye tests from age 3–4.
If you are concerned about your child's eyes, book an appointment at Prime Optometrists Auburn. We serve families across Auburn, Berala, Lidcombe, Granville, Parramatta and Western Sydney.