**3. Conclusions**

The new emerging technologies for the diagnosis of DED represent a more objective way of talking about this entity that does not have a gold standard for its diagnosis, they facilitate the work and are very useful for research purposes. It is also important to mention that these technologies are of great help to provide an accurate diagnosis and accurate treatment; however, the preexisting tests for the diagnosis of DED are still useful and when applied with adequate methodology and the required sequence, they provide reliable data to make a correct diagnosis of DED; therefore they continue to be valid and must continue to be transmitted to new generations, especially to take advantage of contact with the patient and clinical observation that is not substitutable with anything.
