What magnifies more a 3 or 5 diopter?

A 5 diopter lens magnifies more than a 3 diopter lens. Diopter strength is a measure of the lens's optical power, with higher values indicating greater magnification ability. Specifically, the magnification power increases as the diopter value increases, making the 5 diopter lens more effective for magnification than the 3 diopter lens.