Keto Flux Reviews If severe allergic reactions have occurred in the past, people should always bring medically prescribed emergency medications with them. Thus, a life-threatening reaction such as anaphylactic shock can be prevented. In age-related macular degeneration (AMD), the central visual acuity of an eye is completely or partially lost. Macula lutea is the medical term for the center of the retina, the site of the sharpest vision. This small highly specialized area is also called "yellow spot".The area, only a few square millimeters wide, is responsible for essential visuals: reading, recognizing faces and fine details, distinguishing colors.In contrast, all the rest of the retina perceives mainly outlines and light-dark contrasts.