RT Journal Article SR Electronic T1 Earliest Symptoms of Diseases of the Macula JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 521 OP 537 DO 10.1136/bjo.37.9.521 VO 37 IS 9 A1 Marc Amsler YR 1953 UL http://bjo.bmj.com/content/37/9/521.abstract AB