pupil / Door view lens

The existing entrance door has a small lens to see outside the house.
But this small lens can look at only the front of a house. So, somet
imes people have a feeling of insecurity. The lens which has a wide fie
ld of view can see upside, the bottom, both side of entrance door as
well as the diagonal line of the entrance door. This special lens is
rotated inside the house with hand and also there is the groove of the
lens for holding and turning of the lens easily. Outside the house, peo
ple couldn't watch the movement of the lens.