Deuteranomaly is a type of color vision deficiency, specifically a form of red-green color blindness where individuals have a reduced sensitivity to green light. It is caused by an anomaly in the medium-wavelength cone cells in the retina, leading to difficulties in distinguishing between certain shades of red and green. This condition is the most common type of color blindness, affecting a significant number of males, as it is linked to the X chromosome. People with deuteranomaly often perceive colors differently, but they typically retain some ability to distinguish between them.