Progressive lenses, also known as progressive multifocal lenses, are specially designed eyeglass lenses with multiple focal points that can simultaneously meet various visual needs such as farsightedness, myopia, and presbyopia. The design inspiration for progressive lenses comes from the shape of an elephant's nose, where the curvature of the front surface of the lens increases continuously from top to bottom, resulting in a gradual change in refractive power. This design allows the upper part of the lens to be the distance zone, the middle part to be the medium distance zone, and the bottom to be the near zone, providing clear far, medium, and near vision.