The term 'RETINA FEATURE' can be broken down into two words: 'RETINA' and 'FEATURE'. The word 'RETINA' refers to the light-sensitive layer of tissue at the back of the eye, which is responsible for vision. The word 'FEATURE' refers to a distinctive characteristic or quality of something. In this case, the term 'RETINA FEATURE' refers to the cones in the RETINA, which are specialized cells that are responsible for color vision and detecting fine detail.