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.
You can tell whether you have astigmatism by looking at your eye prescription. The box 'Cyl' will show the power you need to correct astigmatism, if you have one. Axis tells the manufacturer of the glasses or contact lenses where the astigmatism is and where the power should be to correct it. Causes of Astigmatism. Astigmatism is caused when the cornea of the eye becomes oblong or oval rather than spherical. A cornea which has astigmatism has two curves, a flat curve and a steep curve so light is focused at two points instead of more clearly at just one point.