There may be some difference in the number of diopters between fast and slow dilation, but the difference is generally not significant. Because different methods of dilation are suitable for different groups of people, you need to choose the appropriate method of dilation according to the situation. The main differences between fast and slow pupil dilation are in terms of the population, medication and recovery time, and the results are similar, but the two types of pupil dilation are applicable to different groups of people. Slow pupil dilation mainly uses 1% atropine gel, which can paralyze the ciliary muscle, experience light to get an accurate refraction, generally suitable for children under 12 years old pupil dilation optometry. Fast pupil dilation mainly use compound tropicamide eye drops, through the ciliary muscle paralysis, to get the accurate refraction, generally suitable for people over 12 years old optometry.