Out of focus - "shortsighted"

First camera - slammed it in a car door, kept it for parts. Bought another one, because I liked it. Dropped it with the lens open, then all images were very out of focus. Decided to try to fix it using the old parts. Changed the lens assembly - just a matter of careful disassembly and reassembly, little screws and tiny ribbon cables which you unlock, pull out, put back, lock. Got a camera that was much better - usable, but still somewhat "shortsighted". When focusing over about 2 meters away, images came out with a slight blur, small enough to be invisible unless zoomed in. Investigated to see if I could recalibrate the firmware - no easy fix. So I thought about it. A shortsighted person has an elongated eye - retina too far back. I tried tightening the 3 screws on the sensor at the back of the lens assembly - no. So I put a piece of paper, folded to about 1.5mm thick, in between the lens assembly and the LCD. Much better - now I can take up to 3 MP photos without noticing the blurry focus. 7 megapixels is still blurry beyond 2 meters. (I also thought about glasses, but that would have looked really silly.) ... just sharing my experience. The problem is 90% solved as far as I'm concerned, the camera is still very useful for video where the resolution doesn't matter so much, and short range shots of documents, the two things I used it for mainly anyway. But if you have some advice, I'd love to hear it.