Deaf diliema

Deaf  people are devoid of two of their senses.But since they look normal and behave normally, no one can make out their travails till they open their mouth.Since they cannot hear they cannot speak and developing language becomes a major problem.Their education also suffers.
Any announcement  at public platforms cannot be heard by them.They use and need visuals extensively. At work place they face problems too ....How one can manage with them in office see link.
.http://www.signstation.org/index.php/ten-things-to-know-if-you-work-alongside-deaf-people