side effects of cortizone shots, does it effect vison, how many can ;you have.

I have had cortizone shots in my feet, in a set of 3.

They are for Narpathy, after 3, it has been a year and tried again

they work for a month. I am now on the third time, are there long term problems with this....some one said it could damage you vision, weight gain, musel damage.

Any information you can give me I would appreiciate.

Thank You,

Rosemary Chinery