Why do I see blurry lines when I look into the miniscope? Is it supposed to be blurry?

Most people with refractive errors report seeing blurry lines.  Those with astigmatism may even encounter curved lines at certain angles.  The appearance of the lines (sharp or blurry) does not have a significant impact on the quality of the vision test results.  One can still adjust the line spacing to get a maximum overlap.