The<unk>  <unk>  is a region within the<unk> centralis at the centre of the retina of the human eye that is devoid of retinal blood vessels. The geometric centre of the<unk>  is often taken to be the centre of the macula and thus the point of fixation. The<unk>  is an important anatomical landmark in fluorescein angiography. Its diameter is 0.5mm, the central 1.5 degrees of an individual's visual field.
Foveal avascular zone
Optic pit
Macula of retina
Epiretinal membrane
Retinal nerve fiber layer
Optic cup 
Corneal button
Myopic crescent