Long Term Effects of Multifocal Orthokeratology on Corneal and Choroidal Structures in Healthy Subjects With Myopia- A Pilot Study

Brief Summary: Orthokeratology has the benefit for slowing down myopia progression and enabling unaided vision during the day. To investigate proposed possible changes of conventional and multifocal orthokeratology in the cornea and choroid this study will image both structures with high resolution optical coherence tomographs over a six month period. Findings will help to plan larger trials over a longer period of time in adults and teenagers.

Recruitment & Eligibility

Inclusion Criteria

Men and women aged over 18 years
Myopia defined as between -1D and -6 D with an increase of 0.5D within the last 18months prior to inclusion
Prospect orthokeratology contact lens wearers
Normal findings in the slit lamp examination, no corneal pathologies

Exclusion Criteria

Participation in a clinical trial in the previous 3 weeks
Presence of any abnormalities (such as refractive surgery) preventing reliable measurements as judged by the investigator
Current contact lens wearers
Pregnancy, planned pregnancy or lactating

Arm && Interventions

Group	Intervention	Description
Orthokeratology contact lens group	Orthokeratology lens	-

Primary Outcome Measures

Name	Time	Method
Quantitative changes in the corneal thickness	1 year
Qualitative changes in the corneal structure	1 year

Secondary Outcome Measures

Name	Time	Method
Quantitative changes in the choroidal thickness	1 year
Qualitative changes in the choroidal structure	1 year

Locations (1): Center for Medical Physics and Biomedical Engineering, Medical University of Vienna
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Vienna, Austria

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