Ocena wpływu noszenia soczewek ortokorekcyjnych na postępowanie krótkowzroczności u dzieci
Orthokeratology Influence upon the Progression of Myopia in Children
Oxana Borissova, Ewa Pelczar
Wrocławskie Eye Laser Center
Kierownik: lek. med. Ewa Pelczar
Summary: Orthokeratology is a
procedure using reverse-geometry gas-permeable lenses
for the temporary reduction of myopia. Since the 1960s,
rigid contact lenses have been found to control myopia.
Purpose: We wanted to see whether the overnight wear of CKR (Controlled Kerato-Reformation) for orthokeratology would have a similar effect of myopia stability.
Material and methods: A total number of 74 patients were enrolled in this clinical study, 33 males and 41 females, 146 eyes, age between 9 and 18 y.o. The myopia varied from -1.75D to -6.75 D. 74 patients used ortholenses regularly during 1 year with very good effect of myopia correction, without any complications; after that period we asked them to take about 1-month break in CKR use. Refraction and topography (Optivision CornealMap EH 300) was checked after 4-weeks of orthokeratology break. We compared refraction and keratotopography data before ortokerathology procedure and after 1 and 2 years of orthocorrection, waiting 1 month for the cornea reshaping each year.
Results: An average myopia before orthocorrection was -3.76 Dsph -0.37 Dcyl, keratotopography data were Ks 43.71D/ Kf 42.97. After 1 year of orthocorrection, patients had 1-month break, waiting for the cornea reshaping, which ended with an average refraction -3.66 Dsph -0.49 Dcyl and Ks 43.33/ Kf 41.95. The group of 8 patients, who used ortholenses for more then 2 years, had average refraction -4.31 Dsph -0.34 Dcyl and Ks 43.56/ Kf 42.72 before orthocorrection. After 1 year of orthotreatment they had overage refraction -4.11 Dsph -0.58 Dcyl and topography data Ks 43.18/ Kf 42.34. After 2 years of orthotreatment they had overage refraction -4.36 Dsph -0.55 Dcyl and topography data were Ks 43.28/ Kf 42.35.
Conclusion: This study indicates that orthokeratology using the CKR design may reduce the progression of myopia in young people.
Keywords: Myopia, Orthokeratology, Ortholens, CKR, Corneal topography.