Hello and welcome to Healthcare Magic. Thanks for your query.
There are two things which are concerning about his symptoms - one is the blurring of vision and the other is his poor intake. Moreover, since his high fever
seems unresponsive to medication which you've been giving, it better to have a doctor evaluate him. Young children can go into dehydration
and develop other complications quickly, and so, I think it would be better to take him to the ER.
Dr. Sheeba Stephen