Recent research shows that facial expressions are the same in blind and sighted people. This means that those expressions are innate and not learned behavior. This should be obvious to anyone who has raised a baby. Babies begin to smile, frown and perform other expressions long before they would begin imitating those expressions.
Yes, blind people can express the same facial emotions are sighted people, especially if they have not been blind all of their lives. People who become blind later in life are able to make the same facial expressions that they did before they were blind. People that were always blind may have more trouble.
Blind people can express the same facial emotions that everyone else can. Being visually impaired does not stop one from displaying facial emotions. In fact, many visually impaired may be more in touch with their other senses; giving them a heightened ability to express facial emotions. In short, just because someone is blind, it does not mean that they are really that different from everyone else.
Blind people experience all of the same emotions as sighted people, and they can display these on their faces even though they might not be able to see. When you see someone crying or in pain, it's easy to tell by their faces what they are feeling, whether or not they are blind.