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

PURPOSE: To evaluate the effects of Defocus Incorporated Multiple Segments (DIMS) spectacles versus Single Vision Spectacles (SVS) on myopia control and astigmatic changes in adolescents with myopia. METHODS: This retrospective study included 153 myopic children aged 7-14 years who attended our clinic between January 2022 and March 2023 (86 in the DIMS group and 67 in the SVS group), with a follow-up duration of one year. Axial Length (AL) and Corneal Astigmatism (CA) were measured using the OA-2000. Cycloplegic refraction was used to obtain Spherical (S), Cylinder Angle (C), and Spherical Equivalent (SE). Total astigmatism (TA) and corneal astigmatism J0/J45 components were calculated using Thibos' vector analysis. Pre- and post-treatment changes were analyzed using paired t-tests, while between-group comparisons were assessed using the Mann-Whitney U test, independent-samples t-test, and general linear model. RESULTS: < 0.05; Table 1, Figure 1 and Figure 2). CONCLUSIONS: 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.