ALPERN, M Testing distance effects on phoria measurement at various accommodation levels. [electronic resource] - A.M.A. archives of ophthalmology Dec 1955 - 906-15 p. digital Publication Type: Journal Article ISSN: 0096-6339 Standard No.: 10.1001/archopht.1955.00930020912014 doi Subjects--Topical Terms: Accommodation, OcularHumansStrabismus--physiology