I have dim vision with a yellow tint 12 hours after cataract surgery. should i be worried?

Likely OK: The microscope light at the time of the surgery will leave an "after image" with discoloration of vision for hours. This is normal most likely.

May be normal: It is often normal for the cornea to swell slightly after cataract surgery. It may take several days for the swelling to improve. Your surgeon will evaluate your eyes postoperatively and should be able to reassure you.