The invention discloses a method for protecting eyesight. The method comprises the following steps: presetting a time period; detecting an audience who is the most close to the screen once in each time period, and acquiring the viewing distance of the audience; determining whether the viewing distance is smaller than the preset value; when the viewing distance is smaller than the preset value, generating a first reminding information indicating that the viewing distance is too small, until the audience moves out of the area of the preset value. According to the invention, only the viewing distance of the audience who is the most close to the screen is acquired, such that whether the audience viewing distance satisfy the requirement of a scientific viewing distance can be rapidly determined; it is not necessary to acquire a viewing distance of every audience, such that working load of corresponding hardware is reduced. When the viewing distance of the audience is smaller than the preset value, the first reminding information is generated for indicating the audience that the viewing distance is too small. The audience adjusts the viewing distance according to the first reminding information, such that a requirement of scientific and healthy viewing of TV program can be satisfied, and audience health is prevented from being influenced by a small viewing distance.