The hospital 308 laser is based on the number of spots, a spot is the area of the 308 device's light outlet, probably as big as a dollar coin. The charge for a spot is not standardized, depending on the price of the local hospital, generally 30-80 yuan. (Public hospitals in the same area charge less than private hospitals)
For example, if the area of a white spot is smaller than the area of a dollar coin, you only need to take a picture of it, and charge the money for 1 spot according to the calculation of 1 spot; however, if the area of the white spot is more than the size of a dollar coin, you have to take a picture of it for 2 times in order to cover it all, and charge the money for 2 spots according to the calculation of 2 spots.