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 McLean Tonometer 
 
This is from about 1920. The instructions in the box describe normal intra-ocular pressure as being between 20 to 40 mm Hg. 
       
McLean Tonometer from 1920 to measure intraocular pressure for glaucoma detection
McLean Tonometer from 1920 to measure intraocular pressure for glaucoma detection
McLean Tonometer from 1920 to measure intraocular pressure for glaucoma detection
McLean Tonometer from 1920 to measure intraocular pressure for glaucoma detection
       
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