This is a dryfire drill everyone should do in the beginning stages of pistol competition. First, and always remove all ammo from the room and check the chamber 3 times to assure it is empty.
Hold the pistol at low ready, using your competition grip and stance. Face a white wall. Raise the gun and obtain a perfect sight picture. Lower gun and repeat.
Next, do the same but close your eyes.
Before you raise the gun. You are striving to see a good sight picture when you open your eyes.
This drill makes you trust your index.