Eye Shield for a Microscope
The difficulty and discomfort amateurs experience in learning to use a microscope with both eyes open, or in trying to keep one eye shut, can be easily overcome by attaching a piece of cardboard, similar in shape to the one shown in the sketch, to the barrel of the microscope. The hole A should be of sufficient diameter to allow the cardboard to slide freely up and down on the barrel to the proper adjustment. This simple arrangement will relieve a great deal of the eye strain and will be of assistance to the most experienced users of microscopes.—Contributed by G. B. Fenton, Charleston, W. Virginia.
Shield to Cover the Eye That is Not Used When Looking into a Microscope