This item is a vintage Keeler Pantoscope ophthalmoscope, a specialized diagnostic instrument used for examining the interior of the eye, which was popular among ophthalmologists in the 1950s and 1960s。

  老式基勒全景检眼镜，是一种专门用于眼底内部检查的眼科诊断器械，在20世纪50至60年代深受眼科医师青睐。（机器翻译）