Axial Length Changes Associated With Orthokeratology Treatment Procedures.

This investigation was one component of the multifaceted FSU College of Optometry Orthokeratology Study. Specifically, this investigation was designed to assess the changes that occur in axial length as a result of orthokeratology contact lens fitting procedures. Ultrasound A-scan biometry for axial length was performed pre-treatment and at approximately two months into treatment on ten randomly selected orthokeratology patients. Results showed an unpredicted slight mean increase in axial length of 0.174 + 0.108 mrn. This finding suggests that the myopia reduction associated with orthokeratology procedures results to a greater extent from the increase in the radius of curvature and sphericalization of the cornea than from any changes in the eye's overall axial length.