Photopic Response

Photopic response refers to how the human eye perceives brightness and color in well-lit conditions, primarily through cone cells in the retina. It describes the eye's sensitivity across different wavelengths of visible light under bright lighting, where colors appear vivid and details are clear. This response peaks around 555 nanometers (greenish-yellow light), meaning the eye is most sensitive to this wavelength in good lighting. Understanding the photopic response helps in designing lighting and displays that align with human vision, ensuring they appear natural and comfortable to the observer in bright environments.