The visually impaired, unlike the hearing impaired, can learn the spoken language(s) in their environment by listening. However, depending on the degree of visual impairment, methods such as using enlarged letters or tactile methods such as Braille may be necessary for reading and writing. In addition, sign language requires tactile recognition. In recent years, text-to-speech and dictation systems on computers and smartphones have improved, allowing visually impaired people to read and write by voice.