Earliest sign of papilloedema -
Early (incipient )papilloedema is characterised by, obscuration of disc margins (nasal margins involved first , then superior , inferior and temporal) blurring of peripapillary nerve fibre layer absence of spontaneous venous pulsations at the disc mild hypaeremia Refer comprehensive ophthalmology (6 th edition )A K Khurana, page no. 324
Less of pulsation
Blurring of disc margin
Obliteration of cup
Cotton-wool spots
Neuro-ophthalmology