The third speaker of the goalkeeper seminar was the optician Sven Empen. First, he confronted the audience with the quote "Every goalkeeper still has potential in visual perception!" While the athletic, technical and tactical areas of goalkeepers have been intensively researched by sports scientists in recent years, he believes there is still enough potential for development in the area of perception. Since, according to him, people today experience 90% of all sensory impressions via vision, it is important that perception via the eyes functions properly. However, this is not always the case. Studies in China showed that myopia in the youthful Chinese population is 90%. In our country, too, one in three people under the age of 30 now wears glasses. In view of these figures, Sven Empen advises having the goalkeeper's eyes checked for proper function in an eye test from time to time.

He also noted that myopia is on the rise in today's world. The main cause, he said, is that people in today's world use their eyes very often for proximity, such as with cell phones, iPads or computers. As a result, the eyes are extremely fixated on proximity, he said. Due to the constantly restricted angle of vision, peripheral vision is being lost more and more.

He then used the four visual sub-areas recognized by the American Skiffington to show how vision works. It is an interplay of eye movements, the alignment of the eyes to the target, the focusing of the eyes and the visual processing. Only when the interplay of all these areas is ensured does the person, or in our example the goalkeeper, grasp the situation optimally. If one part of this perception is disturbed, he perceives the game situation inaccurately or slowed down. A delayed reaction or a wrong decision are the result. Various test procedures can be used to find out whether visual impairments are present. These visual deficiencies can be trained and thus improved or even eliminated.

A newer tool that can be used to increase perception is strobo glasses. With their help, better concentration is produced, because with fewer image sequences, the eye must perceive the image and anticipate the ball. Especially the perception, reaction time, visual concentration, peripheral perception and eye-hand coordination can be improved with the help of the strobo glasses. The glasses have a total of eight levels, which allows you to extend the darkness up to one second.

Before the strobo glasses are used, according to Empens, it should first be clarified which eye is the leading eye, i.e. the better eye, of the goalkeeper. Once this has been clarified, the leading eye can, for example, be switched off by the strobo goggles or the perception time can be extended by making appropriate adjustments to the goggles in order to consciously train the other eye. According to Empens, another suitable aid for this purpose is the eye patch. More intensive perception can also be achieved by using tennis balls.

In the subsequent practical part of Simon Panter, the goalkeepers and conference participants were able to perform certain exercises with and without Strobo glasses under the guidance of Sven Empen, in order to get to know and test the effect of the Strobo glasses.