PT - JOURNAL ARTICLE ED - , TI - Perception and its Disorders AID - 10.1136/bjo.55.5.357-b DP - 1971 May 01 TA - British Journal of Ophthalmology PG - 357--357 VI - 55 IP - 5 4099 - http://bjo.bmj.com/content/55/5/357.3.short 4100 - http://bjo.bmj.com/content/55/5/357.3.full SO - Br J Ophthalmol1971 May 01; 55