6. Making self understood through speaking, writing, typing, or other means normally used.
Cannot convey a simple message, such as the presence of a hazard.
7. Understanding communication by—
(a) verbal means (such as hearing or lip reading) alone,
(b) non-verbal means (such as reading 16 point print or Braille) alone, or
(c) a combination of (a) and (b),
using any aid that is normally, or could reasonably be, used, unaided by another person.
Cannot understand a simple message due to sensory impairment, such as the location of a fire escape.