No, it’s not like the “evil-eye”, or some disease, or a Ferris wheel.
The Yashica Dental Eye was camera developed for medical and dental photography on 35mm film (remember those?) It basically only has one setting, and a macro lens built within a ring flash. How neat. Though now with the digital revolution we now lug around a huge Canon DSLR with a mounted ring flash instead for all our dental photography.
The term “dental eye” came about when this camera with its ring flash, was used on portraits – giving the trademark “ring” reflected in the subject’s eyes.
See and read more on the camera here.