Efficacy of Spectacle Correction Using Defocus Incorporated Multiple Segments in the Myopic Population

The objective of this study was to evaluate the efficacy of DIMS (Defocus Incorporated Multiple Segments) in comparison to control group (CTRL) in a wide age group of European progressive myopes (6-26 years).

In this prospective, non-randomised observational study, 78 myopes with progression myopia to -0.25 to -8.5 D and astigmatism to -0.25 to -2.25 D chose DIMS (n=54) or single vision lenses (SV) (n=24). Baseline measurements included spherical equivalent refraction (SER) and axial length (AL), evaluated at regular intervals.

In participants younger than 15 years of age, slower progression of myopia (SER) (SER -0.25±0.35 D) and reduced axial elongation (0.09 ± 0.16 mm) was observed in Group 1 (DIMS) compared to Group 2 (CTRL) (SER -0.73 ± 0.57 D, AL 0.30 ± 0.20 mm), both significantly at p-value <0.05. In participants over 15 years of age, Group 3 (DIMS) exhibited minimal myopia progression (SER -0.24 ± 0.29D) and negligible axial elongation (0.00 ± 0.07 mm), Group 4 (CTRL) demonstrated more pronounced axial elongation (SER -0.20 ± 0.53D, AL 0.01 ± 0.06 mm).

It can be stated that the DIMS variant is 68.7% more effective in the category of subjects younger than 15 years of age in the effect on AL and 65.6% more effective in the effect on SER compared to the SV lenses. This deceleration in myopia progression is statistically significant in the under 15 age group. A statistically significant difference in the effect on SER in this age group was observed for DIMS.