lazy eye 
noun
An eye with poor vision that is mainly caused by underuse, especially the unused eye in a squint.There may be other eye problems as well, including poor vision and crossed or lazy eyes (strabismus)....
- There was a second part to this study, which was to look to see whether anybody had improved vision in their lazy eye, having lost the vision in their fellow eye.
- If lazy eye is not treated, the weaker eye's vision may never improve and it may even become blind.
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