I had optic neuritis in left eye it had nearly gone now starting in right eye. should i get it checked? neuro appoint in 4weeks for possible ms

Right away: If there is optic neuritis starting, then it should be treated as soon as possible for the most likely improvement. Don't wait 4 weeks. If there is a neuro-ophthalmologist in your area see him/her tomorrow. Or get the neurologist to see you right away. MS certainly is quite likely if both eyes have been involved in this way.

Yes, get it checked: Important to treat visual issues ASAP. If you have bilateral optic neuritis, you need to have a blood test for NMO spectrum disorder to check aquaporin 4. MS may be an answer, and your neurologist should be able to exclude other causes.