# One-Year Results of Orthokeratology and Defocus Incorporated Multiple Segment Lenses in French Children for Myopia Control

## TL;DR

This study compares two methods for controlling myopia in French children over one year and finds similar effectiveness between orthokeratology and DIMS lenses.

## Contribution

Provides real-world data on myopia control techniques in French children over a one-year period.

## Key findings

- Both ortho-k and DIMS lenses showed similar axial length elongation after one year.
- DIMS lenses had a significantly lower spherical equivalent refraction change at six months, but not at 12 months.
- Mean axial length elongation was 0.12 mm for ortho-k and 0.16 mm for DIMS at 12 months.

## Abstract

Purpose

Myopia is a common refractive error affecting vision. This study aims to evaluate two real-world methods for myopia control: orthokeratology (ortho-k) and defocus incorporated multiple segment (DIMS) spectacles lenses.

Methods

This retrospective observational multicenter study was conducted on a French population with myopia, treated with either DIMS spectacle lenses or ortho-k for myopia control. Baseline axial length (AL) and spherical equivalent refraction (SER) were recorded, along with data at six and 12 months. AL change was used as the primary criterion for myopia control.

Results

We included 111 patients in the ortho-k group and 88 in the spectacle lenses group. The mean baseline AL was 24.46 mm in the spectacle lenses group and 25.05 mm in the ortho-k group. No significant difference in AL elongation was observed between the two groups at the six- and 12-month time points. At six months, SER change in the DIMS group was significantly lower than in the ortho-k group; however, this difference was not maintained at 12 months. The mean AL elongation at 12 months was 0.12 mm (n=162) in the ortho-K group vs. 0.16 mm in the DIMS group (n=70).

Conclusion

The study provides new real-world data on myopia control techniques in French children. Both techniques appear to yield similar results over a one-year period.