Can anyone tell me what this is?

The SHLBGS and I frequent estate sales to look of for cool shit from time to time. I saw this and had to have it. I don't know what it is, but I know it has a lamp, some sort of magnifying lens, an adjustable cheek rest that's missing a part, and a some type of card or picture holder on the end away from the lens. I was thinking some type of old eye tester / optometry tool. What say ye?