1. The optician's manual Author(s): Brown, Christian Henry, 1857-1933, author Publication: [Philadelphia?] : [The Keystone], [1896?] Subject(s): Vision, OcularEyeglassesVision Tests
2. Eye studies: a series of lessons on vision and visual tests Author(s): Johnston, J. Milton, author Publication: Chicago : J.M. Johnston, 1892 Subject(s): Vision, OcularRefractive ErrorsVision Tests
