Maybe you will know why options images always is blured? Look at the image – “blur.jpg”.
I tried change dimensios in theme setings – “dim.jpg” and images dimensions, but options images all the times is blured. Here is OpenCart problem? Maybe you know some solution?
Unfortunately this is not a theme related issue. Opencart automatically resizes product option images – in your case to 50×50 pixels. The problem is that there is no setting for this size – it is hard coded.