I don't know if the loss of an eye (mentioned in this answer) is related, but there is a one-eyed embodiment described in the 1909 patent US941812, Telemeter for two successive observations.
"Another arrangement of the telemeter, in which the two images are produced successively in a common image field filling the entire ocular field, seems to be still more advantageous."
Thus it seems the comment at the bottom of the the first page in this article might not be 100% correct. I don't know the date, but the one-eyed blink comparator in Wikipedia looks pretty darn old!
"Tragically, Pulfrich lost one eye in 1906,
preventing him from using the stereographic tool from then on."
The full quote can be found in the other answer.
above: "English: Blink comparator in the Meridian hall of the Helsinki observatory. Made by Carl Zeiss in early 20th century." from here
above: from Finding Pluto with a Blink Comparator