Are human eyes most sensitive to the red or blue or yellow green part of the visible light spectrum?

Human eyes are most sensitive to the yellow-green part of the visible light spectrum, particularly around the wavelengths of 555 nanometers. This sensitivity is due to the peak response of the cone cells in our retinas, which are responsible for color vision. While we can perceive red and blue light, our visual system is optimized for detecting greenish tones, which is important for activities like identifying foliage and other natural elements in our environment.