GP Insights: <br>Tailoring Astigmatism Correction in Ortho-k</br>

By
John Mark Jackson, OD, MS, FAAO
May 1, 2026
3 min

Contact Lens Spectrum

Objective:

To discuss advancements in orthokeratology (ortho-k) lens technology for correcting astigmatism.

Approach:

Key Findings:

Toric ortho-k lenses are recommended when corneal elevation difference exceeds 30 µm.
Residual astigmatism can occur if corneal and refractive astigmatism are mismatched.
Under-correcting corneal cylinder can lead to better visual outcomes.

Interpretation:

Practitioners should consider the balance between corneal and refractive astigmatism when selecting ortho-k lenses to minimize residual astigmatism.

Limitations:

The study is based on a single case example, limiting generalizability.
Further research is needed to establish broader guidelines for astigmatism correction in ortho-k.

Conclusion:

Tailoring ortho-k lens design, including the use of spherical lenses or customized toricity, can enhance visual outcomes for patients with astigmatism.