Can a motorcycle rider use a visor that restricts their view at night in Northern Ireland?

No, not safely. The Highway Code advises against tinted eye protection that restricts vision in darkness or poor visibility.

Motorcycle rule 84 also warns that scratched or poorly fitting protectors can limit vision. Use compliant eye protection appropriate to the light conditions and make sure it is clean and undamaged before riding. This is distinct from the legal obligation to wear a suitable fastened motorcycle helmet.