These are design factors related to vision and hearing (as well as speaking). This section focuses on areas in which sight or hearing is temporarily and noticeably affected by external changes or other situational factors.
Clear and easy-to-read labels and markings are required so users with weak eyesight can use products without issues. It is helpful to also have non-visual means of confirmation, such as auditory or tactile confirmations.
Unable or Difficult to See
Screen displays are difficult to see in dark rooms or near windows illuminated with direct sunlight. Therefore, displays must be designed to be easy to see in consideration of all kinds of usage situations.
Difficult to See at a Distance
Products must be designed to match how and where they are used, so that users can confirm information even at a distance.
Narrow Field of View
Looking at a control screen may reduce the user's attention to their surroundings, and some usage conditions may restrict the user' s field of view. Therefore, products must be designed so users do not fail to notice pertinent information in their surroundings.
Unable to Tell Apart
Users with color blindness have difficulty distinguishing certain colors. And when many buttons and icons are clustered together, it is difficult for anyone to tell them apart. Therefore, products must be designed so their controls are readily distinguished.
Some users have hearing disabilities, and some people have difficulty hearing. And when ambient noise levels are high, it is hard for anyone to hear tiny sounds. Therefore, products must be designed to ensure alerts and confirmations are heard, either with volume adjustments or other means.
Unable to Speak
Users may not be able to speak loudly in libraries and other locations. Therefore, it is important to design voice input interfaces with due consideration of the user's circumstances and surroundings.
Difficulties in speaking
It is not socially appropriate to speak in art galleries, libraries, and other places. At other times, colds or other illnesses may prevent people from speaking. Therefore, it is important to fully consider the usage environment when implementing voice inputs or similar technologies.