Approximate the number of photons which enter your eye when you look for a tenth of a second at the Sun. The net power output of the Sun is around 4.2 x 1026 W. (Suppose that the electromagnetic radiation from the Sun is at 550 nm and the diameter of your pupil is 1 mm.)
Determine the energy absorbed by your eye throughout that time, supposing that all the photons are absorbed? The net power output of the Sun is around 4.2 x 102 W.