Final answer:
The development of improved microscopes significantly enhanced medical diagnosis by allowing for the detection of viruses and microscopic details of diseases, thus enabling quicker and more accurate medical test results.
Step-by-step explanation:
The development that helped to provide quicker, more accurate medical test results and led to improved diagnostic processes was the advancement of microscopes. Early diagnostic techniques, such as the electron microscope, enhanced the ability to detect various diseases, especially at the microscopic level where viruses could be discerned. In particular, the electron microscope played a significant role in medical research by uncovering numerous viruses affecting all types of living organisms. This advancement has been critical in the development of molecular diagnostics and the improved diagnosis of diseases. Moreover, technologies such as Polymerase Chain Reaction (PCR) and other DNA amplification methods have provided rapid and reliable ways to detect pathogens and genetic mutations, leading to more targeted treatments for diseases.