A simple method of testing for color-blindness A simple method of testing for color-blindness

Collection: Medicine in the Americas, 1610-1920 Author(s): Sewall, Henry, 1855-1936 author Publication: [Philadelphia?] : [publisher not identified], [1886?] Language(s): English Format: Text Subject(s): Color Vision Defects -- diagnosis Color Perception Tests Copyright: The National Library of Medicine believes this item to be in the public domain (More information) Extent: 1 folded sheet (4 pages) NLM Unique ID: 101736106 (See catalog record) OCLC no.: 1060577712 Permanent Link: http://resource.nlm.nih.gov/101736106