Astigmatism is usually required for adolescents, but not for adults. Astigmatism is caused by asymmetry of the corneal meridian of the eye. Astigmatism examination mainly includes corneal topography and computerized optometry. For astigmatism in the eyes of children and adolescents, they need to have their pupils dilated, which allows the adjusting ciliary muscles to relax enough to achieve the correct astigmatism. Therefore, children and adolescents can have their pupils dilated to get an accurate reading and to prevent errors in eye astigmatism tests due to self-adjustment of the eyes. If it is an adult optometry, it can be done without astigmatism, but to get an accurate astigmatism status, you can also do astigmatism. It is recommended that patients in need of optometry visit a regular hospital to assess their condition and choose the appropriate type of optometry under the guidance of a doctor.