Blind Pension is not normally paid outside the State. However, if you go to live in Northern Ireland, and were getting Blind Pension immediately before you moved, your pension can continue to be paid for up to 5 years, subject to certain conditions.
If you are leaving the State you should tell the Department and return your pension book(s). If you are being paid directly into your bank or building society you should tell the Department, not the financial institution. When you return here to live you should re-apply immediately for your pension.