While the human eye is capable of perceiving a great range of frequencies, it's generally believed that the vast majority of people can only see up to around 60 frames per second. This number varies depending on a person's age, visual acuity, and overall health; some people report being able to see significantly more or less than 60 FPS. There are also a number of factors that can affect how many FPS someone perceives, such as monitor refresh rate, image quality, and interactivity.