Wydanie 2/2005

Ocena odległych wyników zastosowania ortosoczewek CKR

The Long-Term Results of CKR / Orthokeratology Lenses Use

Oxana Borissova, Ewa Pelczar

Wrocławskie Eye-Laser Center
Kierownik: lek. med. Ewa Pelczar

Summary: Orthokeratology is a temporary reduction of myopia by the programmed application of RGP contact lenses to reshape the cornea. Modern orthokeratology achieves this using specially designed reverse geometry gas permeable contact lenses worn during sleep.
Purpose: The aim of this clinical study is to determine the effect of Orthokeratology treatment on patients after wearing the lenses for 6 to 18 months, to determine the effect of the procedure on myopia reduction, treatment complications and patient's satisfaction.
Material and methods: A total number of 146 patients were enrolled in this clinical study, 271 eyes, 67 male and 79 female, age between 9 and 54 years. The myopia varied from -1.25D to -6.5D, in each patient baseline examination was performed, then followed by routine follow-up examinations. We used CKR/Orthokeratology lens design (Controlled Kerato-Reformation) and Optivision CornealMap EH 300 Corneal Topographer.
Results: Patients were divided into 3 groups: group I with spherical equivalent up to -2.75 D (112 eyes), group II between -3.00 D and -4.75D (118 eyes) and group III between -5.00D and -6.50D (41 eyes). After CKR/OrthoK treatment and reduction in myopia, group I ended with an average myopia of -0.18D, group II -0.45D and group III -0.76D. The mean value of uncorrected vision acuity after CKR/OrthoK treatment was 1.0 for the first group, 0.96 for the second group and 0.85 for the third group. The number of corneal abnormality seen trough biomicroscopy was: 7% (8 eyes from 112 eyes) in the first group, 31% (37 eyes from 118 eyes) in the second group and 63% (26 eyes from 41 eyes) in the third group. However, patient's satisfaction was very high in all groups of patients, 98%, 96% and 100%, respectively.
Conclusions: Orthokeratology using the CKR design is a very effective procedure, with good results of myopia correction and proven to be safe for myopia up to -4.75D.

Keywords: Myopia, Orthokeratology, Orthotreatment, Ortholens, CKR, Corneal Topography.