Be careful when ordering
While these glasses are a good value and are of good quality, you should be careful when ordering that you choose the right size. I thought these were going to be like my father wore years ago that had two clips that slid down over the top of your sight glasses and could be rotated up when indoors. These have four little clips on them; one in each corner, and they are designed to clamp over your glasses. Herein lies the problem. These come in at least three different sizes and shapes with no guide to tell you what size to order. My sight glasses are the small rectangle kind so I ordered the smallest rectangle ones available; the #52 rec 15. When they arrived and I tried to put them on, that's when I noticed they were so small that the bottom edge lies about 3/4 of the way down my lens. I cannot return them, so I have resorted to the fact that I can use them for driving since my head stays still, but to use them during any activity would be a waste of time. I guess the take away message here is to contact whoever your seller is and ask them what size will fit your sight glasses. Don't make the same mistake I did.
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