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 Stenopeic (slit) lorgnette for eye refraction exam 
  
There is no consensus on who developed the slit lorgnette. It is used for determining the axis of astigmatism in the course of a refraction.

There is a slot for a corrective lens. There are three different slits of various widths. There are several small holes to narrow the central bundle of rays.
       
 
       
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