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Objective: To find a simple means for calculating eyecamera magnification to permit estimation of true retinal object size from a retinal photograph. Methods: The position of the focusing knob on 3 different retinal cameras (TRC-50F and TRC-50X; Topcon America Corp, Paramus, NJ; and the CR6-45NM Nonmydriatic Retinal Camera; Canon Inc, Tokyo, Japan) was measured during optic nerve photography and correlated with the refractive error, or spectacle refraction, of the subject (N= 11 for eachdoi:10.1001/archopht.121.5.707 pmid:12742849 fatcat:ueznqhftxfeedo2srvnuldjudu