Night Lenses- Orthokeratology

What are Night Lenses or Orthokeratology?

• Ortho?K uses custom rigid gas?permeable (RGP) lenses worn during sleep to gently flatten the central cornea.
• This contact lens reshapes the cornea, thereby correcting refractive errors during the day. 
• Effects are temporary and require nightly wear to maintain clear vision. 
• Vision Typically improves over several nights, with full effect in 1-2 weeks. 

What Ortho?K Can Correct

• Myopia (short sightedness) Up to−6.00 D; most predictable up to −4.00 D.
• Astigmatism: Typically up to 1.50–1.75 D depending on lens design.
• Other uses: Myopia control.  

Benefits

• Clear daytime vision without glasses or daytime contacts.
• Non?surgical and fully reversible.
• Useful for active lifestyles
• Widely used in children for myopia control, slowing eye elongation by 40–60% in studies.

Risks and Considerations

• Main risk: eye infections, typically preventable with proper hygiene.
• Initial discomfort from rigid lenses is common.
• Requires consistent nightly wear and regular follow?ups. 

Who Is a Good Candidate?

• Mild to moderate myopia, low to moderate astigmatism.
• Children with progressing myopia.
• Adults wanting daytime freedom from glasses or contacts.
• Not ideal for very irregular corneas (e.g., keratoconus). 

Orthokeratology remains a reversible, non?surgical option for vision correction and myopia management.