It is so that I can get the blip-page and mantain it, when my eyes are in the middle of the book.

My first question is:

Does it matter how big the blip is?

My second question is:

when I have the blip, and after a while some part of the blip, for example a little bit of the left strip of the blip disappears and shifts to the right strip of the blip, and the same thing happens. It is like my eyes focus differently, or it feels like the is some blind spot in my eyes that appears in timeintervals.

all advice and tips are apprecicated!

Thx