Figure 5.

Diagram of the International Classification of Retinopathy of Prematurity zones²⁴ with a superimposed fundus photograph on which the optic disc and fovea are indicated.

Notes: The green circle indicates the region of retina viewed through a 28 diopter lens used with the indirect ophthalmoscope. The band delineated by the yellow lines represents the location of the anatomical “rod ring”,⁹ which is an annular region in which there is a high density of rods. The ring is concentric with the fovea and passes just nasal to the optic disc and approximately 18° temporal to the fovea.