Biometric Factors Changes Caused by Myopia Orthokeratology (OK) Lens

The Influence on Biometric Factors Changes by Different OK Lens

Subjects fit with VST or CRT type lens are reviewed 1 day to 2 year after first wearing the lens. Ocular examinations were performed, including slit-lamp biomicroscope, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), corneal topography (Medmont E300W, Medmont Pty Ltd, Melbourne, Australia), corneal refractive power (autorefractometer, KR880, Topcon, JAPAN), corneal epithelial thickness (Optical Coherence Tomography, RTVue-XR), axial length using IOL-Master 700 (Carl Zeiss Meditec AG). To investigate corneal and retina changes caused by overnight OK lens.

Inclusion Criteria:

• Normal subjects without any history of ocular surgeries or diseases (except for refractive errors) or systemic diseases that might affect contact lens wearing. The spherical error between -1.0 and -5.0 D, cylindrical error of at most 2.0 D, and a corrected distance visual acuity of 20/20 or better.

Exclusion Criteria:

• Subjects who had previously worn contact lens, were also excluded