If you have an older, drafty house, it can be kind of hard to keep temperature even and comfortable from room to room. We get a lot of inquiries here at Birdtricks about how cold is too cold for our parrots. The concerns generally stem from the knowledge that many parrot species originate from warm climates.
Astigmatism in only one eye may cause lazy eye (amblyopia) if present from birth. The affected eye does not 'learn' how to see because the brain ignores the signals it receives. Amblyopia can be treated with eye patching if diagnosed early enough, before the vision pathways in the brain are fully developed.
There are a number of causes associated with amblyopia, or lazy eye. In fact, almost any vision development condition can cause it. Common causes include strabismus, or imbalanced eye position. You'll notice strabismus if the eyes cross or if both eyes turn outward. Someone may also develop amblyopia if one eye is more farsighted or nearsighted than its counterpart.