Trypan Blue is a vital dye used in biological research to assess cell viability. It selectively stains dead cells blue, allowing scientists to distinguish between live and non-viable cells under a microscope. This property makes it a useful tool in various applications, including cell culture and toxicity testing. In addition to its role in research, Trypan Blue is also utilized in medical settings, particularly in ophthalmology. It can help visualize certain tissues during eye surgeries, enhancing the precision of procedures. Overall, Trypan Blue serves important functions in both laboratory and clinical environments.