Regarding acute papilloedema:

Ans: b (Visual acuity normal; colour vision decrease)Ref: Khurana, Vision and Neuro Ophthalmology pg. 288The other options are features of papilitis.In chronic papillodema, there may be enlargement of blind spot. In papillodema, visual acuity is normal, pupillary reactions are brisk i.e., there is no RAPD in contrast to papilitis. Papillitis is optic neuritis due to inflammation.Clinical featuresPainful ocular movementsColor vision is decreasedVisual acuity decreasedRAPD Usually unilateral