[erick (Eric)]

Well I don't use an eye patch to preserve my night vision in my observing eye - I just make sure that my environment doesn't destroy that by keeping to low level red light or no light and work by feel. But I do use an eye patch on my non-observing eye so I can comfortably keep it open. That's the way to observe which best suits me.

Suitable eye patches are available at pharmacies. try a few different types - I prefer the soft ones.