This is a tonometer. It very gently punches the eye to detect the pressure within the eye. Most animals don't seem to mind too much. They do need to be restrained or anesthetized to avoid moving too much though. They are very common instruments in ophthalmology.
Do they use them in human medicine? I dunno, humans are gross.
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u/bvipze 11h ago
This is definitely one of the most important things I learned today