An optimized method for the design of progressive addition lens (PAL) is proposed in this study, aiming at the characteristics of the population that experiences a transition from myopia to presbyopia. The height expression of the surface of the PAL is proposed based on an aspherical formula, and a continuously varying conic coefficient is used to adjust the optical power and astigmatism distribution. Two PALs with an additional power of 1.5 dioptres were designed for comparison, using the spherical height and the aspheric height expression, respectively. The optical power and astigmatism distribution are given in the design results, and the free form verifier (FFV) of ROTLEX Ltd. in Israel is used to verify the results obtained via simulation. The results show that the optical power around the assembly centre of the optimized PAL annularly increases. The maximum astigmatism distribution of the lens does not exceed 1.25 dioptres, thereby not exceeding 83% of the additional power. In the area above the assembly centre, the astigmatism at any position is less than 0.5 dioptres. The length of the power stabilization zone in the near zone is approximately 20 mm. The optical power of the distance zone of the optimized PAL is annularly increased, which is beneficial to alleviate the asthenopia of myopia. The maximum astigmatism of the lens is considerably reduced, which is easily accepted by customers whose defect in vision has changed from myopia to presbyopia and wear PALs for the first time.