Helpful video but I really don't think referring to someone who can hear well as "a normal person" (27:10) is acceptable, as this implies someone with a hearing impairment isn't normal.
Some words (names and terms) were mispronounced! Narrator should have done his homework! Examples: Anosmia (1:46), sinusitis (1:56), nasolacrimal duct (4:06 - LOL)...