Efficacy of Different Interventions for Progressive Myopia After Orthokeratology Lens Wear

Summary

Myopia has emerged as a significant concern impacting the visual health of children and adolescents on a global scale. According to research conducted by Holden BA et al., it is projected that by the year 2050, the worldwide prevalence of myopia and high myopia will experience a substantial increase, affecting approximately 5 billion and 1 billion individuals, respectively, with particularly high prevalence rates observed in East Asia\[1\]. The persistent rise in myopia incidence, coupled with the escalation of complications associated with high myopia, is anticipated to exert complex socio-economic repercussions \[2\]. Consequently, the prevention of myopia onset and the management of axial length elongation have become critically important \[3\].

Orthokeratology (Ortho-K) is a procedure that involves the overnight application of specially designed reverse geometry rigid gas permeable contact lenses to achieve temporary corneal reshaping and reduce myopia during the day\[4,5\]. In children with mild to moderate myopia, Ortho-K has demonstrated visual correction efficacy ranging from 80% to 92%\[6,7\]. Nonetheless, its efficacy in controlling myopia progression may not match its corrective efficacy. The therapeutic effect of Ortho-K in decelerating axial elongation is reported to range from 43% to 63%. Despite the use of Ortho-K, approximately 15% of children continue to exhibit rapid axial elongation exceeding 0.36 mm per year.\[8,9\].

In recent years, adjunctive interventions such as low-concentration atropine eye drops, modification of the back optical zone diameter (BOZD) of orthokeratology (Ortho-K) lenses, and low-level red-light therapy (RLRL) have been proposed to augment the myopia control efficacy of Ortho-K. Zhao et al. \[10\] reported that after one year of treatment with either atropine orthokeratology (AOK) or Ortho-K lenses in children aged 5-14 years, the axial length (AL) increased by 0.14 mm and 0.29 mm, respectively. Another study involving children aged 8-12 years \[11\] demonstrated that after one year of treatment, the AOK group exhibited a 17% reduction in AL growth (0.20 mm vs. 0.24 mm). Research conducted by Xiong et al. \[12\] indicated that for children whose eyes elongated by at least 0.50 mm within one year of Ortho-K wear, the combination of RLRL therapy with Ortho-K significantly reduced axial elongation compared to Ortho-K alone. Additional studies have suggested that decreasing the BOZD can enhance the extent and degree of mid-peripheral corneal steepening, thereby decelerating axial elongation \[13-15\].

Most existing studies primarily compare a single intervention against a control group, thereby lacking direct "head-to-head" comparisons. Traditional meta-analyses are limited to comparing two interventions at a time and often fail to assess multiple treatments concurrently. Consequently, most meta-analyses offer only statistical insights into the efficacy of individual interventions. Clinically, it is common to combine two or more interventions to treat myopia, particularly in cases of rapidly progressive myopia. Previous research has indicated that combined interventions may have additive effects in the prevention and control of myopia; however, these findings require further empirical validation.

This study employs a retrospective approach to evaluate the efficacy of various treatment strategies in managing axial elongation in children aged 8-12 years who experience rapid axial progression following Ortho-K lens wear. The objective is to provide a scientific foundation for the development of personalized myopia control plans.

Conditions

• Progressive Myopia
• Pediatric Myopia
• Orthokeratology-related Myopia Progression

Interventions

DEVICE

OK Lens Continuation Group

Continue wearing original orthokeratology lenses with unchanged parameters, follow-up every 6 months.

DRUG

OK Lens + 0.01% Atropine Group

Continue OK lenses + 0.01% atropine sulfate eye drops once daily at bedtime.

DEVICE

OK Lens with Reduced Optical Zone Group

Wear OK lenses with reduced optical zone diameter (adjusted by 0.5mm from original parameters).

DEVICE

OK Lens + Low-Intensity Red Light Group

Continue OK lenses + low-intensity red light therapy (630nm, 6 minutes daily).

Sponsors & Collaborators

• Tianjin Medical University Eye Hospital

  lead OTHER

Eligibility

Min Age

8 Years

Max Age

12 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2026-04-01

Primary Completion

2026-05-01

Completion

2027-04-01

FDA Drug

Yes

FDA Device

Yes