Keith Wagener and Barker classification of hypertensive retinopathy are as follows: Grade 1 : Increased light reflex and narrowing of retinal arterioles Grade 2 : Changes at AV crossings which has further subclassifications: soles sign bones, sign guns sign Grade 3 : Haemorrhages and exudates with copper wire appearance of vessels Grade 4 : Papilledema with silver wire appearance of vessels