For children: According to the American Optometric Association (AOA), children generally should have their first eye exam at six months of age, another exam at age three and again at the start of school. Risk-free children should then continue to have their eyes examined every two years until age 18. For adult: To maintain a lifetime of healthy vision, the AOA recommends a comprehensive eye exam every two years for adults ages 18 to 60, and annual exams for seniors age 61 and older. Source:http://www.allaboutvision.com/eye-exam/preparing.htm