Now that it is Chanuka, there is a tikkun, that after lighting the Chanuka candles (or oil), one should look at the lights and meditate, "hanerot hallalu kodesh heim - these lights are holy." The sefarim say that they represent the original light of creation. Concentrating on the kedusha of the Chanuka lights helps prevent misuse of one's eyes. Some people mediate on the Chanuka lights for the full half hour that is the minimum time the candles should burn.