Who has better eyes - humans or animals?

How do your eyes work? What are the different parts of your eye? Why do some people need to wear glasses or contact lenses? For free home activities sign-up at www.WhoSmarted.com See omnystudio.com/listener for privacy information. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.