The Different Design of Orthokeratology

The Effectiveness and Safety of Different Design of Orthokeratology Lenses to Reduce Myopia Growth

In this study, we intend to enroll orthokeratology subjects aged 8-18 years old with binocular myopia up to and including -4.00 D. They were randomly selected to wear both orthokeratology of different designs, one with an aspheric wide inversion zone design in the optical zone and the other with a traditional spherical curved segment design, and to investigate the differences between these two lenses in terms of their effectiveness in myopia retardation, defocus, and aberration.

Inclusion Criteria:

• The age is greater than 8 years and less than 18 years
• The myopia was within -4.00D (including -4.00D), and the astigmatism was within 1.50D (including 1.50D) in both eyes.
• Be able to complete 12 months of follow-up
• They were able to understand the purpose of the trial, volunteered to participate, and signed informed consent by the subjects themselves or their legal guardians

Exclusion Criteria:

• One eye met the inclusion criteria
• Patients with systemic diseases causing immunocompromised or affecting orthokeratology
• There are other eye diseases that affect orthokeratology lens wearing, such as dacryocystitis, blepharitis, various inflammation, glaucoma, etc
• Abnormal cornea
• Previous corneal surgery or corneal trauma history
• Active keratitis (e.g., corneal infection)
• Patients with best corrected distance visual acuity of less than 5.0
• Patients with corneal flat curvature lower than 39.00D, or higher than 48.00D
• Patients with refractive instability
• Patients with overt strabismus
• The corneal epithelium showed obvious fluorescent staining, which was not suitable for patients wearing orthokeratology lenses
• Patients with dry eye are not suitable for orthokeratology
• Patients with corneal endothelial cell density less than 2000 cells /mm2
• Patients who had worn rigid contact lenses (including orthokeratology lenses) within the previous 30 days