I'm using a Nikon D5200. Until recently, the image in the viewfinder was clear after focusing. I was able differentiate the blurry part and clear part. But for the past few days I've noticed that images that were focused and captured by the shutter were not clear in the viewfinder.
What could be possible reasons to see blurry images in the viewfinder, but be clear and focused captured photos?
I've cleaned the image sensor using the camera's built-in option. I've also cleaned my lens front element using dry cloth. Neither cleaning solved the problem.