Thank you for the query. As per the history, you are on an Anti-tubercular regimen - Risorine (Rifampicin) and Combutol (Ethambutol) for three months and you have developed blurring of your vision. In this context, I would advise you to get a thorough eye check up done, including fundoscopy. Ethambutol is known for its side effects ophthalmological like Optic neuritis (where vision is blurred and it is painful) and Red green colour blindness (apart from hepatic function derangement and joint pain). To rule out this, you need to go for an eye examination as soon as possible. Hope this helps you.