The visual requirements of military aviators. [No authors listed] Br J Ophthalmol. 1917 Aug;1(8):498-9. doi: 10.1136/bjo.1.8.498. PMID: 18167700
The Visual Requirements of Aviators. [No authors listed] Br J Ophthalmol. 1918 May;2(5):278-9. doi: 10.1136/bjo.2.5.278. PMID: 18167787