Quote Originally Posted by Nikkormat View Post
Ah thanks. It seems the Eagle Eye lenses are still available. There are no markings on this one, so no indication of strength or manufacturer. Are they used purely to aid defective eyesight, or were they at one time permitted as a general aid to shooting?
They are certainly not just used only to aid defective eyesight in the UK, it seems that a good number of people fitted them (like many other bits) because they seem to help, whether this is actually borne out in reality is another story.