In our article, we decided to focus more deeply only on a narrow group of promising sensors, specifically those that use optical phenomena for detection. There are hundreds of these sensory principles and they have been described in many publications, but on many occasions they do not consider their use in real life. However, human health monitoring with wearable electronics has its pitfalls, and the sensory principles often differ significantly from conventional laboratory measurements. Ideal wearable sensors must be non-invasive, compact, easily portable, easy to manufacture, and low cost. These devices can closely monitor life functions, human health, and report long-term a change in the patient’s health indicators. The trend began with simple fitness straps and developed rapidly in the form of variable advanced health accessories such as watches, smart clothing, glasses, contact lenses, rings, and various body extensions and inserts. The arrival of intelligent and wirelessly connected wearable monitoring devices brings a revolution in healthcare. As the healthcare regime moves more toward personalized medicine, the wearable medical market is projected to grow by around 26.4% worldwide to $195.57 milliards between 20. With the advancement of technology, miniaturization, the development of advanced materials, and the advent of the internet, wearable electronics are gaining prominence.
Older methodologies based on invasive sampling with the use of heavy equipment are nowadays being transformed into simple scanning methods that do not require demanding manipulation and also make people feel more comfortable.
Early accurate diagnosis is the key to maintaining a high quality of life. New and improving diagnostic methods for real-time and long-term health monitoring are constantly being established. The development of mankind reflects the efforts of doctors, scientists, and others to maintain and strengthen health, to implement social measures and prevent disease.