Med Lasers.  2021 Dec;10(4):229-237. 10.25289/ML.2021.10.4.229.

Effectiveness of Overnight Orthokeratology with a New Contact Lens Design in Moderate to High Myopia with Astigmatism

• Park Y
• Kim H
• Kang JK
• Cho KJ

• KMID: 2533535
• DOI: http://doi.org/10.25289/ML.2021.10.4.229

Abstract

Background and Objectives
To assess the effectiveness of overnight orthokeratology (OK) in myopia using a new contact lens design over a one-month wearing period.
Materials and Methods
Participants were required to have myopia between –3.00 and –7.50D and astigmatism ≤ 2.00 D to participate in the study. The participants underwent OK with the White OK lens ® (Interojo, Pyungtek, Korea), which has a 6-curve lens design. Participants were assessed at weeks 1, 2, and 4 using slit-lamp bio-microscopy, and tested for refraction, uncorrected distance visual acuity, and corneal topography. Success was defined as achieving a Logarithm of the Minimum Angle of Resolution (logMAR) ≤ 0.1.
Results
A total of 46 eligible subjects with a mean age of 23.11 ± 7.89 years were recruited. Baseline logMAR was 1.18 ± 0.30 and a consistent decrease in logMAR was observed from week 1 to week 4. The success rate was 95.35% at week 4. The mean sphere significantly decreased from a mean pre-fitting value of –4.58 ± 1.28 D to a mean value of –0.65 ± 0.69 D at week 4 (p < 0.0001). Statistically significant corneal flattening was detected during keratometry at week 4.
Conclusion
Overnight OK with the White OK lens is effective for the correction of moderate and high myopia with astigmatism over a one-month wearing period.

Keyword

Myopia; Orthokeratology; Astigmatism