Colour perception changes
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According to last researches, Sildenafil (Viagra) and Vardenafil (Levitra) mainly influence on 5th and 6th types. But 6th type is responsible for perception of dark blue and green colour. From here – a by-effect: colour perception infringement.
Accordingly, council to men: be not surprised and be not upset, if your eyes have changed "point of view" to some time. You should not to get into the car, try draw or do colour photos, to work in graphic editors if you have accepted the Viagra or Levitra pills. It is better to wait that time when excitation will settle, and eyes again can distinguish all shades of colour.
Tadalaphil (Cialis) blocks, besides 5th, also 11th type... This 11th type find in a cardiac muscle, in to gland and in the central nervous system.
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However, what effects are caused by such blockade, meanwhile it was not possible to establish.
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