Your English is better than my Slovakian, so there's no need to make excuses. ;)
<< I'm just practicing Bardon's visualizations. I can imagine object with closed eyes. But I still can't imagine object with open eyes. >>
The main reason that doing the sensory exercises with your eyes open is so difficult is because with your eyes open there is more visual stimulation than with your eyes closed. When your eyes are closed, all you generally see is blackness and this allows you to easily concentrate on just your visualization. But when your eyes are open, all the images of your surroundings interfere with your concentration upon the visualization. There are several ways to make the transition between eyes closed and eyes open a bit easier. One method is to work in a darkened room. This reduces the amount of visual distractions during the eyes-open phase and mimics the blackness of having your eyes closed. Once you can manage your visualization with your eyes open in a darkened room, then gradually increase the light in your room until you can master the visualization, with eyes open, in a fully illuminated room. A second method is to stare at either a black surface of a plain white surface when you build your open-eyes visualization. This will also reduce the amount of visual distractions. A third method is to stare at a wall or into space with your eyes slightly out of focus. This blurs your surroundings and thus diminishes visual distractions. A fourth, and probably the most difficult method is to first build your visualization with your eyes closed and then, holding firmly on to your established visualization, open your eyes. Once your eyes are open, try to hold on to your visualization and let it float before your open eyes. The key in any case is to ignore the increased visual details of your surroundings when your eyes are open. Truly all you should concentrate upon is your visualization itself. Many of the exercises require this sort of transition from mastery with the eyes closed to mastery with the eyes open. This is designed to teach the student how to make these abilities things that can be employed at any moment in their daily life. When any exercise presents a difficulty for you, be inventive and try a variety of different methods to overcome the difficulty until you find the method that works best for you. I'm certain that in the above case, there are more than just these four methods for overcoming your difficulty. I hope that these examples will at least stimulate your imagination and inspire you to devise a method that works well for you.
