1. Measurement of visual acuity;Sloan;Arch. Ophth.,1951
2. Comparison of three types of test target for the measurement of visual acuity;Sloan;Quart. Rev. Ophth.,1952
3. Test cards for the determination of visual acuity;Cowan;Arch. Ophth.,1928
4. Committee on standardizing test cards for Visual Acuity;Jackson;Tr. Sect. Ophth. A.M.A.,1916
5. Report of American Committee on Optics and Visual Physiology: Report on the tests and records of visual acuity;Jackson;Tr. Sect. Ophth. A.M.A.,1930