if you take note of where that orifice is on the lense, then have a look at any pair of typical reading or bifocal glasses, you will see that where the orifice is, there is very little ocular correction in the lense. this got me thinking when I was shoot archery competitively and have the same problem of not being able to see all three points while shooting. I went to my optometrist with my bow and drew it just as I would be shooting and he marked my lenses right where I was looking through them. he then did some measuring and ordered a pair of single vision (distance correction for my eyesight) lenses with the centers of correction ground where those spots were marked. it made all the difference in the world. in archery, we use a peep in the string at the eye, so the application is fairly similar. after trying those glasses, all points of my sight picture were crystal clear. it may be that all you need to do is have a similar pair of lenses made for an old frame. for the 100 dollar cost of the elenses it was well worth it.