Myopia control effect of defocus incorporated multiple segme
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A Study was conducted to determine myopia progression in children who continued to wear the defocus incorporated multiple segments (DIMS) lenses or switched from single vision (SV) to DIMS lenses for a 1-year period following a 2-year myopia control trial which inferred that the myopia management effect was maintained in the third year.

Analysis included 128 children. The children who had worn DIMS lenses continued to wear DIMS lenses (DIMS group), and children who had worn SV lenses switched to wear DIMS lenses (Control-to-DIMS group). Cycloplegic spherical equivalent refraction (SER) and axial length (AL) were measured at 6-month interval. Historical controls were age matched to the DIMS group at 24 months and used for comparing the third-year changes.

Results:
--Over 3 years, SER and AL changes in the DIMS group (n=65) were -0.52±0.69D and 0.31±0.26 mm; these changes were not statistically significant over time.

--SER (0.04±0. 38D) and AL (0.08±0.12 mm) changes in the Control-to-DIMS group (n=55) in the third year were less compared with the first (mean difference=0.45 ± 0.30D, 0.21±0.11 mm) and second (0.34±0.30D, 0.12±0.10 mm) years.

--Changes in SER and AL in both groups over that period were significantly less than in the historical control group (DIMS vs historical control: mean difference=0.18±0.42D; 0.08±0.15 mm; Control-to-DIMS versus historical control: adjusted mean differences=0.30±0.42D; 0.12±0.16 mm).

Conclusively, the myopia management effect was maintained in the third year in children who had previously used DIMS spectacles, as well as in children who switched from SV to DIMS lenses.

Source: https://bjo.bmj.com/content/early/2021/03/17/bjophthalmol-2020-317664?rss=1
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