When I look through the eye hole of the Canon Rebel t1i, the view and numbers of the eye hole are blurry even though everything is auto focused, and when I take the picture, it's clear. Why is the eye hole viewing blurry?

If you have a specific zoom lens on and it will take shots in MF manual focus but wont in AF auto focus you could have a broken ribbon connector in the lens. Try with another zoom lens if you get the same problem it could be the camera. If it works OK then the ribbon in the affected lens may need replacing.

The T1i does not have this feature, like most digital SLR cameras. You should just look through the viewfinder to take the photo, which gives you a much more precise view of the photo, where you can better assess the correctness of focus, etc.
This feature is called "Live View" and is available on some newer or higher end models.

Is this happening when you try to focus on something pretty close to the camera?
If that's the problem, it's because the lens has a focus distance 0.25m/0.8ft meaning the subject has to be this far away for the lens to be able to focus. You could buy a new lens with smaller focus distance if this is a big problem to you.

Okay looking at the back of the camera where the viewfinder eye piece is right side upper corner you will see a small wheel partially covered by the rubber rim of the viewfinder by the side of it you will see a small line with a + and - that is a diopter that actually tunes the camera viewfinder to your shooting eye. Pretty fancy eh? Anyway what I do is set the camera in auto focus and focus on an object in a brightly lit room and when the little green light come on in the lower right corner of the viewfinder which is the auto focus confirmation light start turning this wheel one way and another until the image you see come into sharp focus. I don't know about you but I need about three clicks to the + side before everything looks sharp.

YES IT JUST NEED TO ADJUST DIAPTOR WHEEL NEXT TO VIEWFINDER. ADJUST ACCORDING TO YOUR EYE.

Next to the viewfinder ther is a diopter adjustment so you can change the focus in the viewfinder. this is so if you need glasses the camera can be set for you. Start by focusing the camera on something, then slide to turn the diopter adjustment until it looks sharp and try not to bump it.

In the manual mode, you have to set the focus (distance to subject), aperture and shutter speed. Did you set all of them before you shot the picture?

check and make sure you do not have the soft focus turned on. that will make the pictures "soft" in focus or seem out of focus.

1. The viewfinder's diopter is probably out of focus (doesn't affect Auto Focus of photos). There's a dial and a +/- symbol next to the viewfinder. Turn the dial till you can see clearly through it. Alternative reason: The glass in the viewfinder is dirty/foggy. Use camera cleaning solution (a drop) on a cotton bud to clean it.

2. Malfunction needs Canon Service Centre to take a look at.

Try cleaning the contacts on the camera body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol.