In an active mechanism, a variety of stress enters the nuggets, the stress applied to the strain, and the initial dimensions of the design are subject to change, although small. Therefore, in designing, producing and maintaining all sensitive industrial and non-industrial nuggets, it is necessary to study the amount of strain and calculate the stress caused by the applying of force. Stress-strain diagrams are very important to understand the behaviour of materials under different loads. In order to measure stress-strain, widely used optical methods that can be transformed into a conventional way of calculating the strain in Forming of metals. In these methods, a HE-NE laser or a diode laser beam can also be used to calculate strain values. Many studies have been done so far and researchers have presented a variety of methods. Researchers have always been looking for a strain calculation method that, while maintaining high precision, can deliver results at an affordable speed. In the following, some of these studies have been discussed and examined, and the disadvantages and advantages of each one are expressed