Easy to Take / Easy to Take

One of the problems of using contact lenses after cleaning them is that the lenses often are flipped over and users need to use hands to turn it back. It is often users would touch the inside of the lenses and contaminate them with fingers. Another problem is that after wearing ONE piece of contact lenses, binocular disparity of eyes inhibits us to wear another piece of lenses and even take it easily by vision. This is because binocular disparity caused by wearing only one piece of contact lenses might be over 250 degrees. Therefore, users cannot detect the distance and size of the object easily.