sentence: Cone cells are less sensitive to light than rod cells.
sentences_before: They react to light and work best in relatively bright light.
sentences_after: Human eyes usually have different types of cone cells. This makes it possible to distinguish different colors. Rod cells are more sensitive to light, but cannot tell colors apart. In a publication done in 1935, Osterberg thinks that there are about 6 million cone cells in a human eye.
concept_name: cone cell
headings: Cone cell
categories: Eye anatomy