For best viewing, use Holmes stereoscope, and view from three to four feet from your monitor.
"A Holmes stereoscope, the most popular form of 19th century stereoscope
In 1861 Oliver Wendell Holmes created and deliberately did not patent a handheld, streamlined, much more economical viewer than had been available before. The stereoscope, which dates from the 1850s, consisted of two prismatic lenses and a wooden stand to hold the stereo card. This type of stereoscope remained in production for a century. It is primarily American, although it is often named Mexican stereoscope."
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