Miroslav asks:

I have read one of your recent interviews with one of the animators of Dragon Ball Kai/Super. He said that they had had to redrawn many scenes because they had been drawn with techniques that are now prohibited to use, because they can be harmful for eyes. Is that really true that anime from early 90s and prior ones can damage your sight?

They can't damage your sight, but there's a (very) small chance that, if you have epilepsy, some of the animation effects might trigger a seizure.

This whole thing started back in December 1997. Pokémon was fairly new on Japanese TV, and was only on its 38th episode. That episode, "Electric Soldier Porygon," had Satoshi/Ash and Pikachu exploring the inside of a malfunctioning Pokéball transmitter machine, and at some point, Pikachu uses his lightning attack to blow up some virtual missiles that were coming their way. The explosion was animated with a digital red-blue strobe effect.

In a bizarre incident that the press referred to as "Pokémon Shock," nearly 700 kids were hospitalized with some sort of medical problem after watching the episode (although some were fine within a few minutes). A few were diagnosed with epilepsy. A giant media scandal ensued, and Pokémon was pulled off the air. Police and the Health Ministry conducted investigations, the show producers and key members of the anime industry met with doctors to try and figure out what happened exactly.

Four months later Pokémon came back to television. But alongside it were new rules that govern effects that can be used in anime: