The Effect of Wearing Orthokeratology on Objective Visual Quality

Study Overview
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Brief Summary
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The visual quality indexes of these patients before and after Orthokeratology treatment were compared: 4 mm higher strehl ratio (SR) , 4 mm higher order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Comas, Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai)

Detailed Description
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USING OPD-SCAN III instrument method: Drag The joystick to focus on the screen prompt, and the device automatically starts to measure the aberration when the yellow focus is shown; Simk will change from black to rose red when the aberration is measured to start measuring the corneal topography, prompting the patient to blink the tear film evenly and press the button on the joystick when the focus is completed.The following data were obtained and analyzed: 4 mm high order STREHL rate (SR) , 4 mm high order corneal aberration (Hoa ) , Spherical Aberration (SA) , Coma Aberration (Coma) , Trefoil Aberration (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai)

Official Title
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The Effect of Wearing Orthokeratology on Objective Visual Quality

Conditions
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Visual Quality

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: The subject understands the purpose of this clinical trial and is willing, able and committed to return to the center for all clinical trial visits and to complete all research related procedures Exclusion Criteria: 1. Associated with corneal abnormalities, such as active Keratitis (corneal infection) , corneal dystrophy, Keratoconus, corneal Leukoplakia, corneal hypoesthesia, or previous corneal surgery, or a history of corneal trauma; 2, there are other eye diseases, such as Dacryocystitis, dry eye disease, conjunctivitis, blepharitis, Uveitis, and other inflammation, Glaucoma, cataracts, fundus disease, eye tumors, ocular trauma, squint patients; 3. A history of allergy to contact lens or contact Lens Solution. 4. Test results indicate that subjects with contraindications or unsuitable for wearing Orthokeratology.

Ages Eligible for Study
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Minimum Age: 8 Years
Maximum Age: 25 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Before wearing the Orthokeratology<br>OPD-Scan was performed and the following data were recorded: 4 mm high order strehl ratio (SR) , 4 mm high order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Coma Aberrations (Coma) , Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai) | |
| Wear Orthokeratology for a week<br>OPD-Scan was performed and the following data were recorded: 4 mm high order strehl ratio (SR) , 4 mm high order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Coma Aberrations (Coma) , Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai) | |
| Wear Orthokeratology for a month<br>OPD-Scan was performed and the following data were recorded: 4 mm high order strehl ratio (SR) , 4 mm high order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Coma Aberrations (Coma) , Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai) | |
| Wear Orthokeratology for three months<br>OPD-Scan was performed and the following data were recorded: 4 mm high order strehl ratio (SR) , 4 mm high order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Coma Aberrations (Coma) , Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai) | |
| Wear Orthokeratology for six months<br>OPD-Scan was performed and the following data were recorded: 4 mm high order strehl ratio (SR) , 4 mm high order corneal aberrations (Hoa ) , Spherical Aberrations (SA) , Coma Aberrations (Coma) , Trefoil Aberrations (RMS) , corneal aspheric index (Q, e) , corneal surface regularity index (SRI) , corneal surface asymmetry index (Sai) | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 4 mm high-order strehl ratio | Objective visual quality 1 | 6 months | 
| 4 mm high-order corneal aberrations (Hoa) in Microns | Objective visual quality 2 | 6 months | 
| Spherical Aberrations (SA) in Microns | Objective visual quality 3 | 6 months | 
| Coma Aberrations (COMA) in Microns | Objective visual quality 4 | 6 months | 
| Trefoil Aberrations in Microns | Objective visual quality 5 | 6 months | 
| corneal aspheric index(Q) | Objective visual quality 6 | 6 months | 
| corneal aspheric index(e) | Objective visual quality 7 | 6 months | 
| corneal surface regularity index (SRI) | Objective visual quality 8 | 6 months | 
| corneal surface asymmetry index (Sai) | Objective visual quality 9 | 6 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Objective visual quality, Orthokeratology