Some may say that the technology intrinsic to computers is too toxic to use as a healing modality. This is not so. Always make sure there is plenty of natural light in the room to dilute the light energy from the computer screen.
Natural lighting is always the best.
If this is not possible, or if the computer is being used at night, the use of full spectrum light bulbs is a good second choice. Plants produce negative ions, the energy which promotes greater mental clarity, so having living plants in the room near the computer will help neutralize the positive ions produced by the computer equipment. Move your eyes around the screen and the room from time to time. The amethyst helps re-direct the energy of the CRT away from you, and the obsidian helps to neutralize the energy. 5. This should pass within an hour of finishing the program.