Predicting time to refractive stability after discontinuation of rigid contact lens wear before refractive surgery

Tsai, Patricia S.; Dowidar, Amgad; Naseri, Ayman; McLeod, Stephen D.

doi:10.1016/j.jcrs.2004.05.021

Cited by 37 publications

(4 citation statements)

References 9 publications

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“…The second part of this study focused on changes to the corneoscleral profile in keratoconus eyes with regular specialty lens wear. Corneal warpage related to small-diameter corneal lenses is a well-known phenomenon [24][25]. Corneal lenses are typically fitted using the 3point-touch technique, which creates an apical contact area of 2-3 mm with minimal clearance over the apex, an intermediate clearance zone and a midperipheral contact annulus [26].…”

Section: Discussionmentioning

confidence: 99%

The corneoscleral shape in keratoconus patients with and without specialty lens wear

Nuffel

Consejo

Koppen

et al. 2021

Contact Lens and Anterior Eye

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Section: Discussionmentioning

confidence: 99%

The corneoscleral shape in keratoconus patients with and without specialty lens wear

Nuffel

Consejo

Koppen

et al. 2021

Contact Lens and Anterior Eye

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“…Although corneal contact lenses vary according to fitting choice, they may cause changes in the curvature of the anterior and posterior surfaces due to the mechanical effect and the hypoxia they cause, and even if the contact lenses are removed, the stabilization process may take several weeks. 40 , 41 Because it is not possible to wait this long in practice, measurements were obtained from our patients at least 1 hour after lens removal, as per routine practice in our clinic. The extent to which the ORA device performs a true biomechanical assessment is controversial, as the pressure and waveform-based parameters obtained with the ORA are seriously affected by the geometric properties of the cornea (e.g., thickness) and by intraocular pressure.…”

Section: Discussionmentioning

confidence: 99%

Superiority of Baseline Biomechanical Properties over Corneal Tomography in Predicting Keratoconus Progression

Erol¹,

Atalay²,

Özalp³

et al. 2021

tjo

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Objectives: To determine corneal biomechanical and tomographic factors associated with keratoconus (KC) progression. Materials and Methods: This study included 111 eyes of 111 KC patients who were followed-up for at least 1 year. Progression was defined as the presence of progressive change between the first two consecutive baseline visits in any single parameter (A, B, or C) ≥95% confidence interval or two parameters ≥80% confidence interval for the KC population evaluated by the Belin ABCD progression display. The eye with better initial tomographic findings was chosen as the study eye. Analyzed Pentacam parameters were maximum keratometry (Kmax), minimum pachymetry (Kmin), central corneal thickness, thinnest corneal thickness, 90° vertical anterior and posterior coma data in Zernike analysis, and Belin Ambrosio Enhanced Ectasia Display Final D value. Corneal hysteresis (CH) and corneal resistance factor (CRF) were analyzed together with the waveform parameters obtained with Ocular Response Analyzer (ORA). Factors related to KC progression were evaluated using t-tests and logistic regression tests. Statistical significance was accepted as p<0.05. Results: There were 44 (mean age: 27.1±8.5 years, female: 25) and 67 (mean age: 31.1±9.1 years, female: 36) patients in the progressive and non-progressive groups, respectively. Although Pentacam parameters along with CH and CRF were similar between the two groups, ORA waveform parameter derived from the second applanation signal p2area was statistically significantly lower in the progressive group (p=0.02). Each 100-unit decrease in p2area increased the likelihood of keratoconus progression by approximately 30% in the logistic regression analysis (β=0.707, p=0.001, model r2=0.27). Conclusion: Parameters derived from the second applanation signal of ORA may be superior to conventional ORA parameters and corneal tomography in predicting KC progression.

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“…(6) Corneal warpage appears to be gradually reversible after discontinuation of contact lens wear. Tsai et al reported that the discontinuation of rigid gas permeable (RGP) lens wear for six weeks may be necessary to ensure refractive stability before the initial examination for surgical correction of refractive error 39 . Hashemi et al reported that a two-week soft contact lens-free period seemed to be adequate for the cornea to stabilize 40 .…”

Section: Discussionmentioning

confidence: 99%

Value of corneal epithelial and Bowman’s layer vertical thickness profiles generated by UHR-OCT for sub-clinical keratoconus diagnosis

Jiang

Yang

et al. 2016

Sci Rep

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Ultra-high resolution optical coherence tomography (UHR-OCT) can image the corneal epithelium and Bowman’s layer and measurement the thicknesses. The purpose of this study was to validate the diagnostic power of vertical thickness profiles of the corneal epithelium and Bowman’s layer imaged by UHR-OCT in the diagnosis of sub-clinical keratoconus (KC). Each eye of 37 KC patients, asymptomatic fellow eyes of 32 KC patients, and each eye of 81 normal subjects were enrolled. Vertical thickness profiles of the corneal epithelium and Bowman’s layer were measured by UHR-OCT. Diagnostic indices were calculated from vertical thickness profiles of each layer and output values of discriminant functions based on individual indices. Receiver operating characteristic curves were determined, and the accuracy of the diagnostic indices were assessed as the area under the curves (AUC). Among all of the individual indices, the maximum ectasia index for epithelium had the highest ability to discriminate sub-clinical KC from normal corneas (AUC = 0.939). The discriminant function containing maximum ectasia indices of epithelium and Bowman’s layer further increased the AUC value (AUC = 0.970) for sub-clinical KC diagnosis. UHR-OCT-derived thickness indices from the entire vertical thickness profiles of the corneal epithelium and Bowman’s layer can provide valuable diagnostic references to detect sub-clinical KC.

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Predicting time to refractive stability after discontinuation of rigid contact lens wear before refractive surgery

Cited by 37 publications

References 9 publications

The corneoscleral shape in keratoconus patients with and without specialty lens wear

The corneoscleral shape in keratoconus patients with and without specialty lens wear

Superiority of Baseline Biomechanical Properties over Corneal Tomography in Predicting Keratoconus Progression

Value of corneal epithelial and Bowman’s layer vertical thickness profiles generated by UHR-OCT for sub-clinical keratoconus diagnosis

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