Open eyes vs. closed eyes

["newbieonekenhobby" <newbieonekenhobby@...>]

Dear all,

a) Is there any meaning to the fact that I have less problems 
focusing and visualizing with open eyes than with closed eyes ? 
This is new btw; in the past, it was the opposite.

b) Is the instruction "start with closed eyes and redo with open 
eyes" mandatory or is it just a trick because working with closed 
eyes is supposed to be easier as a first step e.g.?

Many thanks.
NB