What was photo refraction originally used for in NASA?


What was photo refraction originally used for in NASA?
I have heard about the eccentric photo refractor as a NASA spinoff and how NASA is using photo refraction as a technique to help detect vision problems for school-aged children. However, I would like to know about the original usage of photo refraction in NASA, and how it works (I heard that it was originally used as a photo processing technique).

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