Tratak- To improve memory and other benefits

Tratak or fixed gaze meditation is practised on one's favourite god's image or a black dot or Om symbol or swastik symbol or a on candle flame.It is better done indoors in a dimly lit room.The object of concentration is kept 3 feet away at the eye level.The breathing should be first regulated.
Then look at the picture steadily without blinking or staring or straining the eyes.Then close the eyes after a minute and try to visualize the object.Reapeat this 4-5 times.
Regular practice of this yoga increases the concentration,mental and memory power.