Impact of Defocus Incorporated Multiple Segments Spectacles Versus Single Vision Spectacles on Myopia Control and Astigmatic Changes in Adolescents

DIMS lenses effectively slow myopic progression in adolescents by reducing Spherical Equivalent shift and suppressing axial elongation. Compared with SVS lenses, DIMS wear reduces horizontal/vertical astigmatic components but may increase oblique total and corneal astigmatism over long-term use. These findings highlight the importance of monitoring directional astigmatic changes during DIMS intervention, particularly in children with high baseline or oblique astigmatism.