Stability of wavefront aberrations during the daytime after 6 months of overnight orthokeratology corneal reshaping.
OBJECTIVE
To evaluate the stability of wavefront aberrations during the daytime after 6 months of overnight orthokeratology corneal reshaping.


METHODS
A prospective study of 26 eyes using the Ultravision BE lens design during 6 months of overnight wear. Uncorrected visual acuity (UCVA), cycloplegic refraction, and wavefront aberrometry were measured at 8 AM (within 1 hour after awakening and removing lenses), 1 PM (5 to 6 hours after lens removal), and 6 PM (10 to 12 hours after lens removal).


RESULTS
There was no significant difference in UCVA between 8 AM, 1 PM, and 6 PM (P=.383). Spherical power from wavefront aberrometry showed significant regression from 8 AM to 1 PM (P<.001) and stabilized near zero diopters. Total root-mean-square (RMS) increased and higher order aberration RMS and defocus (Z4) decreased between 8 AM and 1 PM (P<.001) but did not change for the rest of the day (P>.001). There was no statistically significant change in astigmatism (Z3 and Z5) (P=.449) and coma (Z7 and Z8) (P=.145) between 8 AM, 1 PM, and 6 PM. Spherical aberration (Z12) showed regression throughout the day (P<.001).


CONCLUSIONS
After 6 months of overnight orthokeratology wear, some optical aberrations showed regression during the day. Despite no significant change in UCVA during 10 to 12 hours, there was a significant increase in defocus (Z4) within the first 5 hours after removing the orthokeratology lens and a decrease in spherical aberration (Z12) throughout the day.
Stillitano
Iane
I
Contact Lens & Refractive Surgery Sectors, Department of Ophthalmology, Federal University of São Paulo, Paulista School of Medicine, São Paulo, Brazil. ianestillitano@oftalmo.epm.br
Schor
Paulo
P
Lipener
Cesar
C
Hofling-Lima
Ana Luisa
AL
D002940:Circadian Rhythm; D019781:Corneal Topography; D003941:Diagnostic Techniques, Ophthalmological; D005403:Fixation, Ocular; D006801:Humans; D054158:Orthokeratologic Procedures; D011446:Prospective Studies; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy*; D013997:Time Factors; D014792:Visual Acuity