Retinal refers to something that is related to or affecting the retina, which is a thin layer of light-sensitive tissue lining the back of the eye. In medicine, it can refer to conditions or treatments that involve the retina, such as retinopathy (a disease of the blood vessels in the retina) or retinal detachment (when the retina becomes separated from the underlying tissue). The term "retinal" is also used more broadly to describe something that has a deep, intense color, often associated with red hues.