Abstract
Purpose :
To purpose was to evaluate the changes in the accommodation response and internal spherical aberration in myopic children and adolescents wearing orthokeratology lenses for 12 months and analyse subjects’ response after a month of stopping treatment.
Methods :
A prospective study was carried out, 47 healthy subjects (age 12.00 ± 2.46 years) were recruited. Refraction without cycloplegia, high and low uncorrected and best corrected visual acuity (UCVA, BCVA), accommodation lag, horizontal near phoria without correction, corneal topography, corneal and total wavefront aberration were performed at baseline, 1 day, 1 week, 1,6 and 12 months and after one month of dropout orthokeratology wearing.
Results :
The spherical equivalent (SER) before and after 12 months was -3.23 ± 1.57D and -0.36 ± 0.64 D, respectively. Accommodation lag was 0.53 ± 0.39 D and 0.15 ± 0.29 D at baseline and at 12 months, respectively. A high correlation was found between the lag of accommodation value before starting orthokeratology treatment and the difference between PRE-OK lag of accommodation and the visit of 12M. No significant differences were found when comparing after one month of dropout value 0.63 ± 0.36 D with the value before starting. The spherical aberration (SA) increased from the first day of use of the lenses, being statistically significant for all visits. Internal spherical aberration showed a significant decrease for visits of 1W, 1M and 12M (p<0,05).
Conclusions :
By 74% of the subjects in the present study showed a decrease in the lag of accommodation. The decrease in accommodative response was greater in subjects with a higher lag of accommodation at the beginning of treatment. A decrease in the internal spherical aberration was found, which together with the change in the lag of accommodation suggests an effect of OK in the accommodative response. They are necessary to the least 4 weeks to start thinking about a complete reversibility of the treatment and depend on the lens design and myopia.
This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.