Many people think that deafness is less severe than blindness. This opinion is a wrong perception for deaf people. Sign language is one of the languages used by deaf people to communicate. UNY lecturer Dr. Hermanto conveyed this point in a workshop on the development of UNY DiSign on Friday (4/8). He says the deaf community uses sign language due to hearing limitations and accessibility. "Besides that, language development and technology limitations exist," he said.