Presbyopic lenses are lenses made of convex lenses that are used to correct presbyopia and have a magnifying effect when looking at close objects. Myopic lenses are lenses made of concave lenses that are used to correct myopia and have a narrowing effect when looking at close objects. Presbyopia is a physiological weakening of the regulation function due to aging, resulting in unclear viewing of near objects. Myopia is a lack of clarity in looking at long-distance objects due to the increased refractive power of the eye, or the growth of the eye axis. In addition, presbyopia is expressed as a positive number in the refractive index and myopia is expressed as a negative number.