<prompt> Thinnest pa of retinasurrounding optic nerve headFoveolaFoveaNasally to fovea  <response>: Foveola High Yield Facts Posterior Pole: Macula Optic nerve head. Optic disc: 1.5 mm Macula: 5.5 mm Temporal to optic disc Fovea - Centralis : Central depressed pa of Macula, 1.5 mm Foveola - 0.35 mm. Thinnest pa of retina after ora serrata. Contains no ganglion cells, only cones. 