Corneal Versus Ocular Aberrations After Overnight Orthokeratology

Abstract

A greater positive shift in corneal compared with ocular SA on day 7 suggests a negative shift in internal SA, which would be consistent with an increased accommodative response. Lack of any difference on day 1 indicates that this may be an ocular adaptation response toward neutralizing induced positive SA, rather than a direct effect of SA changes on the accommodation mechanism.

Corneal Reshaping and Wavefront Aberrations During Overnight Orthokeratology

“…It helps to understand the visual outcome induced by the corneal remodeling after OK. 8 To the best of our knowledge, this is the first study that has comprehensively evaluated the relationship between the changes in corneal thickness profile and higher-order WAs. Similar findings were reported in previous studies.…”

The influence of orthokeratology compression factor on ocular higher‐order aberrations

“…As the corneal shape is altered during orthokeratology treatment, both corneal and ocular aberrations, primarily spherical and comatic aberrations, significantly increase . Hiraoka et al investigated the correlations between ocular aberrations and axial elongation in 55 children (mean age: 10.3 ± 1.4 years) undergoing orthokeratology treatment for one year and showed that children with greater increases in the root‐mean‐square (RMS) error values for spherical, comatic, and total higher‐order aberrations (HOAs) exhibited slower axial eye growth.…”

Binocular Visual Function in Orthokeratology Contact Lens Wear for Myopia

“…(Stillitano et al 2008) Berntsen et al (2005 found stability of higher order aberrations throughout a day, after one month of OK wear, with 3mm and 5mm pupil sizes. Gifford et al (2013) demonstrated a greater change in corneal than ocular SA from 1 to 7 nights of OK wear, indicating an internal adaptive negative shift in SA, consistent with an increased accommodative response as shown by Tarrant et al, (2009) …”

“…(Stillitano et al 2008, Fedtke et al 2017 While the relationship between SA and accommodation response has been debated, , Tarrant et al 2010 generally accommodation brings about a negative shift in SA. Gifford et al (2013) found a reduction in whole-eye positive SA after a week of OK wear in young adult myopes, when in comparison to increasing corneal positive SA, indicated an internal increase in the accommodative response evidenced by an increase in negative SA. A decrease in accommodative response in MFSCL wear could be due to an increasing depth of focus, which Kang et al (2016) found did not change after two weeks of wear in young myopic adults.…”

“…The reduction of internal eye SA from one to eight nights of OK wear was described by Gifford et al (2013) as showing a likely increased accommodative response, which brings about a negative shift in SA, Taken in summary -OK induced changes in SA, with some possible role of shift in RPR, firstly influence accommodative function and then, by cross-linked relationships, (Schor 1999) influence vergence. These changes are seen more quickly in children than adults, and are more related to the time of myopia progression regardless of age.…”