Zenaku was walking down the road of the land of rivers after he had helped the Kazekage to take over the village of the birds, he was wearing a cloak and a Chinese farming hat as he was just trying to look like a normal every day person walking the road. He was not wanting to show his hidden leaf head band right now cause for all he knew there could be some ninja chasing him down from attacking there village so he was going in disguise.
He could have just went and used a transformation jutsu to hide his look but that would just make him use up his chakra and he was still trying to recover what he had used when he fought in the land of birds. Even tho he was a uchiha using the sharingan for such a long periods of time and his eyes was getting tired from the use he did on them. As he was walking his eyes was getting blurry which was why he was adding some eye drops that should help his eyes to get better, every now and then a Doijutsu user eyes get over used and so they have to use a special eye drop from a rare herb which is supposed to help the eyes recover.
He could have just went and used a transformation jutsu to hide his look but that would just make him use up his chakra and he was still trying to recover what he had used when he fought in the land of birds. Even tho he was a uchiha using the sharingan for such a long periods of time and his eyes was getting tired from the use he did on them. As he was walking his eyes was getting blurry which was why he was adding some eye drops that should help his eyes to get better, every now and then a Doijutsu user eyes get over used and so they have to use a special eye drop from a rare herb which is supposed to help the eyes recover.