## 6 Results of Functionality and Performance Tests
Since a linear behavior was expected, the deviation between the experimental data and the linear fit may be taken as a quantitative parameter to measure the stability of the microinjector, where the lower the deviation, the higher the stability. For both cases, the graphs show a significantly high stability of the microinjector along all hours of operation. If we divide the total time taken for each experiment to supply the whole 1.0 mL, \(t_{Total}\), by \(t_{inter}\) (15 s) and multiply by \(n\) then we get the total number of steps needed to supply the 1.0 mL of tears, \(n_{Total}=7500\pm 8\) steps. Therefore, this method of continuous pulsated injection of artificial tears is proposed for people who have dry eye disease and have an Android device capable of connecting to the Wi-Fi network to automatically and continuously inject medical lubricant drops into the eyes. This method does not require special effort from the patients and guarantees its effectiveness in the treatment, the selection of the right flow avoids flooding the eyes and wetting eyelids. The patient may choose from the plethora of available artificial tears formula. As the drop hits the eyeball, instinctive blinking will help spread the artificial tear over the eye. As there is no direct contact between the device and the eyes, the problems of ocular irritation and contamination of the medication are avoided. The reservoir maintains the fluid at room temperature and is separated from the driving mechanism. The design is non-invasive and comfortable compared to the traumatic external pumps using a tube installed subcutaneously to reach the lateral conjunctival sac. As previously mentioned, the majority of patients with dry eyes belong to the elderly population, thus, a portable, automatic, and practical microinjection device like the one presented here may palliate the patient's physical constraints. The artificial tear microinjection system presented here can have many other considerable advantages in patients with motor problems, the disabled, the elderly, and children. It reduces medical costs and increases patient comfort. A monitored medical study with 30 patients with dry eye syndrome is currently under way. The patients will use the artificial tears microinjection system for three continuous months, regulating the flow according to their needs and another three months attending to the problem by manual drip. The results in which patients establish the difference in their well-being by comparing both methods will be published shortly. [PERSON] al. [26] conducted clinical studies on six severe dry eye patients to whom  
Figure 11: Injection time behavior of the microinjection system versus volume. they apply continuously artificial tears to the eye surface using a catheter implanted subcutaneously and conclude that the ocular surface of all patients improved compared with the manual topical application of drops. [PERSON] al. [PERSON] et al. (2018) also conducted pioneer studies of continuous application of artificial tears, concluding that this method alleviates symptoms in severe dry eye conditions not alleviated by other methods. These previous reports demonstrate the advantages of the continuous injection and viability of clinical applications of the present microinjector.