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Related Experiment Video

Updated: May 11, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

High myopia-partial reduction ortho-k: a 2-year randomized study.

Jessie Charm¹, Pauline Cho

¹School of Optometry, The Hong Kong Polytechnic University, Hong Kong SAR, China. jessie@eyecare.com.hk

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|May 7, 2013

Summary

This summary is machine-generated.

Partial reduction orthokeratology (ortho-k) combined with daytime spectacles slowed myopia progression in high myopic children. Axial elongation was significantly reduced in the ortho-k group compared to the control group.

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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

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Last Updated: May 11, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Area of Science:

Ophthalmology
Optometry
Pediatric Eye Care

Background:

High myopia in children is a growing concern, increasing the risk of serious eye conditions.
Effective myopia control strategies are crucial for managing progression in young individuals.

Purpose of the Study:

To evaluate the efficacy of combining partial reduction orthokeratology (PR ortho-k) with daytime spectacle correction for slowing myopia progression in high myopic children.
To assess the impact of this combined treatment on axial length elongation.

Main Methods:

A single-masked randomized study involving high myopic children (aged 8-11 years) with baseline spherical equivalent refraction of at least -5.75 D.
Participants were assigned to either PR ortho-k with daytime spectacles or full correction with single-vision spectacles (control group).
Axial length was measured using IOLMaster at 6-month intervals over 24 months.

Main Results:

The PR ortho-k group showed a median increase in myopia of 0.13 D, while the control group had a median increase of 1.00 D over 24 months.
Mean axial length increase was 0.19 ± 0.21 mm in the PR ortho-k group versus 0.51 ± 0.32 mm in the control group (p = 0.005).
Axial elongation was 63% slower in the PR ortho-k group.

Conclusions:

PR ortho-k combined with daytime spectacle correction is an effective method for slowing myopia progression in high myopic children.
This treatment strategy significantly reduces axial length elongation compared to conventional spectacle correction.