Discontinuation of Lens Wear in New Ortho-k Children (DOEE2) — DOEE2  

Myopia Clinical Trial

Official title: Discontinuation of Orthokeratology on Eyeball Elongation (DOEE) Study. (2) Discontinuation of Lens Wear in New Ortho-k Children

Status Completed

Clinical Trial Summary

This study aims at investigating the efficacy of myopic control using ortho-k in younger and older children.

Clinical Trial Description

Children wearing ortho-k have been shown to have slower rate of myopic progression than those wearing single-vision spectacles (Cho et al. 2005) or soft lenses (Walline et al. 2009). Younger myopic children (aged 6-10 years old) may have the faster increase in myopia than old myopic children (aged 11-15 years old), i.e. the rate of myopic progression may be different in different age groups and in children with different refractive status (Edwards 1999; Fan et al. 2004; Cheng et al. 2007). Although the refractive correction with ortho-k has been well documented, it is unknown whether the efficiency and reversibility of ortho-k for myopic reduction as well as myopic control are similar in children of different age and refractive groups.

In this 14-month study, the eyeball length in 45 younger (6-10 years old) and 45 older (11-15 years old) myopic children before and after ortho-k will be evaluated. Eyeball elongation will be determined for the first 7 months when single-vision glasses will be prescribed (Phase I) and the next 7 months when ortho-k will be prescribed (Phase I). Rate of myopic progression will be determined and compared between the two groups of children in the two phases. ;

Related Conditions & MeSH terms

• Myopia

• NCT number: NCT01236755
• Study type: Interventional
• Source: The Hong Kong Polytechnic University
• Status: Completed
• Phase: N/A
• Start date: October 2010
• Completion date: December 2013