Hard exudates are seen in the following except

Leukaemic retinopathy It is characterised by pale and orange fundus background with dilated and touous veins. In later stages, greyish white lines may be seen along the course of the veins (due to perivascular leukaemic infiltration). Aerioles become pale and narrow. Retinal haemorrhages with typical white centre (Roth spots) are very common. Occasionally large pre-retinal (sub hyaloid) haemorrhages may also be seen. Ref:- A K KHURANA; pg num:-264