Orthokeratology (Ortho-K): The Complete Guide

Orthokeratology, commonly called Ortho-K, uses specially designed contact lenses worn overnight to temporarily reshape the cornea and provide clear vision during the day.

How Ortho-K Works

The rigid gas-permeable lenses gently flatten the central cornea while you sleep. This:

• Corrects refractive error temporarily
• Provides clear vision without daytime correction
• Creates peripheral defocus that may slow eye growth

Efficacy for Myopia Control

Research shows Ortho-K can slow myopia progression by 50-60% on average. Key studies:

• SMART study: 43% slower axial elongation
• ROMIO study: 43% reduction in myopia progression
• Multiple meta-analyses confirm effectiveness

Who Is a Good Candidate?

Ideal candidates:

• Children aged 6 and older
• Myopia up to -6.00D
• Astigmatism up to -1.75D
• Motivated and responsible
• Good hygiene habits

The Fitting Process

1. Comprehensive eye exam
2. Corneal topography mapping
3. Custom lens design
4. Trial lens fitting
5. Overnight wear and morning assessment
6. Adjustments as needed

Daily Routine

**Evening**: Clean hands, insert lenses, sleep 5-6 hours minimum **Morning**: Remove lenses, clean and store, enjoy clear vision

Risks and Considerations

• Requires excellent hygiene
• Initial adaptation period
• Regular follow-up visits essential
• Reversible if discontinued