The Merit Optical Attachment sticks securely to your glasses with a
small suction cup. Our other apertures are designed to screw into an
existing peep sight on your rifle.
The human eye, whether or not prescription glasses are required, cannot
focus on both sights and the target at the same time. The eye will
constantly shift focus from the sights to the target trying to ensure
proper alignment. Unfortunately, as we age, the eye loses the flexibility
which allows it to do this; thus, sights and target begin to grow fuzzy.
There is a simple way to combat this by increasing your eyes' depth of
field (range of focus). If you look through an aperture or pinhole of
the correct size, you will be able to see both sights clearly, and the
target will be clearly defined as well. It was utilizing the principle of
a pinhole that allowed the original box camera to work without a lens, and
its pictures were in clear focus from about 2 feet out to infinity.
To check out this phenomena for yourself, try this rough, but