Luminous efficiency of visual vision

The optical efficiency of the visual vision is mainly determined by the characteristics of the cone body. The visual field is set to 20 visual field.

The standard optical efficiency ratio is at a wavelength of 555 nm at the peak, and its light metric is defined and internationally available.

Thus, it can be seen that the absolute luminous efficiency of the maximum luminous efficiency can be determined. The maximum luminous efficiency can be calculated from the operation of the photometric definition. CIE specifies the wavelength of 555 nm (the ratio of the rate of 540 THi) when the visual efficiency of the largest visual light, the light efficiency of the monochromatic light K. Set at 683 LM / W.

CIE in 1951 set the standard visual efficiency of dark vision 100 vision, as shown in figure 3.20. It can be seen that the maximum luminous efficiency appears at 507 nm wavelength, and the light efficiency is higher on the short wavelength side. The provisions of CIE, the wavelength of 555 nm (540 TH:), and dark vision related monochromatic light luminous efficiency still is 683 LM / W, on the basis of the relative scotopic luminous efficiency is very harsh, even feel dizzy, what can not see, after a while to see the visual object. This is because the iris shrinks, the pupil diameter becomes smaller, limiting the human eye

The response of the eye to light, and then the rod in the retina of the photoreceptor loss of function, but also the cone and the optic nerve system to reduce the level of response, where the phenomenon of pause, through the L 'M process.