Fig. 1From: Assessment of the effect of age on macular layer thickness in a healthy Chinese cohort using spectral-domain optical coherence tomographyEarly Treatment Diabetic Retinopathy Study (ETDRS) grid. a Delineation of the nine macular sectors, according to the ETDRS, within which we measured macular layer thickness. b Nine ETDRS sectors in Right eye. c Nine ETDRS sectors in Left eyeBack to article page