Pfft, you’re just not thinking laterally. How would they communicate? By touch, of course—think signing on someone’s arm or their hand (an example: in anime characters will occasionally hold up their hand and sketch out a symbol when the spoken form is unclear). Now that communication is solved, you can proceed to write an interesting story about the complexities of a society of blind-deaf-mutes (probably set underground, since if you don’t perceive light, why not?)...
Pfft, you’re just not thinking laterally. How would they communicate? By touch, of course—think signing on someone’s arm or their hand (an example: in anime characters will occasionally hold up their hand and sketch out a symbol when the spoken form is unclear). Now that communication is solved, you can proceed to write an interesting story about the complexities of a society of blind-deaf-mutes (probably set underground, since if you don’t perceive light, why not?)...