Corneal Aberrations,Contrast Sensitivity,and Light Distortion in Orthokeratology Patients: 1-Year Results

Purpose. to evaluate the corneal higher-order aberrations (hoa),contrast sensitivity function (csf),and light distortion (ld) in patients undergoing orthokeratology (ok). methods. twenty healthy subjects (mean age: 21.40�8 years) with mean spherical equivalent refractive error m=-2.19�0.97 d were evaluated at 1 day,1 month,and 1 year after starting ok treatment. monocular ld,photopic monocular csf,and corneal hoa for 6 mm pupil size were measured. results. ld showed an increase after the first night (p<0.05) and recovery to baseline after 1 month,remaining stable after 1 year (p>0.05). spherical-like,coma-like,and secondary astigmatism hoa rms increased significantly (p≤0.022) from baseline to 1-month visit,remaining unchanged over the follow-up. contrast sensitivity for medium frequencies (3.0,4.24,and 6.00 cpd) was significantly correlated with ld parameters at baseline (r≤-0.529,p<0.001). however,after 1 year of treatment,this correlation was only statistically significant for 12 cpd spatial frequency (r≤-0.565,p<0.001). spherical-like rms for 6 mm pupil size correlated with irregularity of the ld (r=-0.420,p<0.05) at the 1-year visit. conclusion. ld experienced by ok patients recovers after one month of treatment and remains stable in the long term while optical aberrations remain significantly higher than baseline. � 2016 elena santolaria-sanz et al.