I dropped my Nikon D3100 and the viewfinder is blurry but just barely. Is that repairable?

I dropped my Nikon D3100 and now when I look through the viewfinder, it's just barely blurry even when I try to focus… But when I use the LED screen… It's fine… And the pictures come out fine. Is this repairable?

You've probably (hopefully) just moved the dioptre adjustment in the viewfinder.

All DSLR cameras can adjust the viewfinder for different eyes, adjusting will be in the manual it will a small knob or slider on the eyepiece.

The way to calibrate it is to mount the camera on a tripod square onto a well lit wall with detail, a brick wall is ideal.

Half press the shutter to force the camera to auto focus, now, without moving anything, look through the viewfinder if it's not sharp adjust the dioptre adjustment til it is and your done.

Adjust your diopter on your viewfinder. First autofocus with your dslr and then move this plus or minus utility until it is clear.