Sometimes adjusting to new loupes can take time. 

It is recommend that you take the opportunity to train your eyes and brain to work together with the new type of loupes. 

Focus on the image below , examine each tooth and after about 30 seconds look away.  (You can also use a typodont) 

Repeat this step several times and your eyes should begin to converge the images. 

Make sure your loupes are adjusted to the same working distance