The practice entails looking at the rising or setting sun one time per day only during the safe hours.  No harm will come to your eyes during the morning and evening safe hours.  The safe hours are anytime within 1-hour window after sunrise or anytime within the 1-hr window before sunset.  It is scientifically proven beyond a reasonable doubt that during these times, one is free from UV and IR rays exposure, which is harmful to your eyes.  To determine the timings of sunrise or sunset, you can check the local newspaper, which also lists the UV Index as 0 during these times. Both times are good for practice - it depends on individual’s convenience.  Sungazing also has the added advantage of getting vitamin A and D during the 1-hour safe period window.  Vitamin A is necessary for the health of the eye, the only vitamin that the eye requires.  If you sun gaze, the spectacles and the associated power in the eye will go away and this will provide better eyesight without glasses.