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Light wave sickness was a sickness fatal to the Daleks but not fatal to Spiridons. The Daleks conquered Spiridon, hoping to discover the secret of the Spiridons' invisibility and reproduce it for their own use on an army kept in suspended animation. Only one Dalek used it, but it died from light wave sickness. The invisible Dalek was discovered by the Third Doctor and a group of Thals. (TV: Planet of the Daleks)

After being the Daleks' prisoner for many years to try and restore the Spiridons' invisibility so that the Daleks could duplicate the process, the Seventh Doctor released a contagion that gave the Daleks the light wave sickness. This destroyed all the Daleks occupying the planet, while affecting the Doctor with the light-wave sickness until he returned to the TARDIS, the TARDIS's dimensional stability keeping his cells immobilised until they overcame his cellular paralysis. (AUDIO: Return of the Daleks)

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