The average distance of the fovea from the temporal margin of the optic disc is -
1 disc diameter
2 disc diameter
3 disc diameter
4 disc diameter
Fovea centralis is the central depressed pa of the macula. It is about 1.5 mm in diameter and is the most sensitive pa of the retina. In its centre is a shining pit called foveola (0.35-mm diameter) which is situated about 2 disc diameters (3 mm) away from the temporal margin of the disc and about 1 mm below the horizontal meridian. Ref:comprehensive ophthalmology AK KHURANA page no :250
Vitreous and retina