“…Smart technology is also used to equip portable objects, such as glasses, in order to evaluate some vital signs, such as heart rate, respiratory rate, regularity of pulse and respiration, the presence and length of apnea events, the temperature distribution on the face, etc. [54]. Such methods are very important for healthcare professionals, be-cause they allow for collecting important medical information without the connection of dedicated hardware to the patient, but with a more natural method.…”