Vision disorders
Amblyopia (lazy eye): signs, causes and treatment options
Amblyopia, also known as "lazy eye", is a condition where one eye does not develop normal vision, often because the brain favours the other eye. It usually begins in childhood, and the earlier treatment starts, the better it tends to work.
What is amblyopia?
When the brain relies on one eye more than the other, the weaker eye's vision doesn't develop fully. The eye itself may look normal, but it doesn't see as clearly.
What causes lazy eye?
- Crossed eyes (strabismus)
- A large difference in vision between the two eyes
- A blockage in the eye, such as a cataract
Signs of amblyopia
- Squinting or tilting the head to see better
- Difficulty seeing clearly with one eye
- Eyes that appear misaligned (crossed or wandering)
- Poor depth perception
- Vision problems that don't improve with glasses or contact lenses
How is amblyopia treated?
Treatment is most effective when started early. Depending on the cause, it can include wearing glasses, patching the stronger eye to strengthen the weaker one, and vision therapy — and in some cases surgery.
When to see an eye care professional
If you notice any of these signs, have an eye examination with an eye care professional so amblyopia can be found and treated as early as possible.
Frequently asked questions
When to go to a hospital instead
Go to the nearest hospital emergency department immediately if you have:
- Sudden loss of vision
- Flashes of light or a shower of new floaters
- Eye injury or chemical splash
- Severe eye pain or a very red, painful eye
- Double vision that comes on suddenly