Comparison of corneal thickness and biomechanical properties between North African and French patients

Lazreg, Sihem; Mesplié, N.; Praud, Delphine; Delcourt, Cécile; Kamoun, H.; Chahbi, Mohamed; Léoni-Mesplié, S.; Smadja, David; Trattler, William; Touboul, David; Colin, Joseph

doi:10.1016/j.jcrs.2012.09.015

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…Lastly, this study was conducted in a cohort of myopic patients in Singapore, a predominantly Asian population, with a high incidence of myopia. As differences in corneal biomechanical properties have been found in different ethnic groups,74 results from this study may not be applicable to all study populations.…”

Section: Discussionmentioning

confidence: 79%

<p>Corneal Ectasia Risk And Percentage Tissue Altered In Myopic Patients Presenting For Refractive Surgery</p>

Ong¹,

Farook²,

Tan³

et al. 2019

OPTH

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PurposeA percentage tissue altered (PTA) score of ≥40% has been advocated as an independent indicator of post-operative ectasia risk following laser in-situ keratomileusis (LASIK). This study was performed to test the hypothesis that refractive procedures, such as laser-assisted sub-epithelial keratectomy (LASEK) or small incision lenticule extraction (SMILE), may alter the range of PTA, within which refractive corneal surgery can be safely performed.SettingRefractive department, tertiary ophthalmic hospital.DesignRetrospective observational study.MethodsReview of case notes was performed for patients who presented for refractive surgeries, other than LASIK. To determine the risk of corneal ectasia for each patient prior to refractive surgery, we estimated what each patient’s PTA would have been if they had undergone LASIK. The Randleman Ectasia Risk Score System (ERSS) was also calculated.Results114 eyes (66 patients) were included. 94 eyes underwent SMILE. 20 eyes underwent LASEK. A significant proportion of eyes had PTA ≥40% – SMILE eyes: up to 31.9%, LASEK eyes: up to 60.0% (at presumed LASIK flap of 120 μm). The maximum calculated PTA was up to 47.9% in the SMILE group and up to 51.5% in the LASEK group. Using ERSS, 12.8–16% of SMILE eyes and 15.0–80.0% of LASEK eyes would have been considered to have moderate-to-high ectasia risk. No post-surgical ectasia was observed at 3 years.ConclusionSMILE and LASEK alter the range of PTA, within which corneal refractive surgery may be performed with a lower risk of developing post-operative corneal ectasia; a safe PTA threshold needs to be determined for these procedures before recommendations for clinical practice can be made.

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Section: Discussionmentioning

confidence: 79%

<p>Corneal Ectasia Risk And Percentage Tissue Altered In Myopic Patients Presenting For Refractive Surgery</p>

Ong¹,

Farook²,

Tan³

et al. 2019

OPTH

View full text Add to dashboard Cite

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“…Lifshitz et al 34 performed a clinical study to attempt to correlate central corneal thickness (CCT) with participants’ baseline CCT and they effectively found that participants of North African origin had statistically significantly thinner corneas than participants of other origins (P < 0.00001). Lazreg et al 35 later in one of the rare studies with this population investigated the corneal pachymetry and biomechanics compared to French participants presenting to refractive surgery clinics, where they also found thinner and lower elastic resistant (biomechanics) corneas in this North African population. Moreover, many studies of corneal shape and curvature have shown that there is no difference with other ethnicities and the compatibility with current OrthoK lenses designs.…”

Section: Discussionmentioning

confidence: 89%

Practice of orthokeratology in Algeria: a retrospective study

Ouzzani

Mekki²,

Chiali

et al. 2021

Journal of Optometry

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Purpose To report the practice of orthokeratology (OK) in Algeria and to investigate the visual outcomes, safety and subjective responses with this technique in myopes. Methods A retrospective chart review of 48 participants using OK lenses since January 2010 were included in the study. Lenses were selected and fitted according to the manufacturer’s recommendations using their respective software and the number of lenses required for a successful fit was recorded. Visual acuity (VA) in logMAR units and biomicroscopic findings were recorded for each visit. Subjective ratings was determined with analogue rating scale was filled in by the investigator, the participants were divided into Group 1 (> 4.00D) and Group 2 (< 3.75D) myopic groups for analysis. Results First lens fitting success rate of 64.58%. There was also a significant difference between the BCVA at baseline and VA at Day 1 (P < 0.05), and no significant difference at Day 7, Day 30 and the final visit (P = 0.51, P = 0.93, P = 0.62, respectively), for Group 2. There was a significant difference between the BCVA at baseline and VA at Day 1, 7, 30 and the final visit (P < 0.05), for Group 1. the patients of the second group were happier but the results from the survey were not statistically significant (P = 0.10), no serious complication was reported. Conclusion the technique was efficient and safe as we didn’t have any serious complication, with a high success rate for first lens fitting.

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“…69 Studies that have compared CCT measurements among Caucasians, Hispanics, Asians and African-Americans have reported significantly thinner measurements in the latter group. 65,66,70,71 Two other studies 69,72 compared CCT measurements between North African individuals and those from Europe including France and Russia. Both studies 69,72 concluded that the North African participants had significantly thinner mean CCT measurements when compared to their European counterparts.…”

Section: Discussionmentioning

confidence: 99%

“…65,66,70,71 Two other studies 69,72 compared CCT measurements between North African individuals and those from Europe including France and Russia. Both studies 69,72 concluded that the North African participants had significantly thinner mean CCT measurements when compared to their European counterparts. Dimasi et al 53 suggested that differences in the thickness and composition of the stromal layer may account for the varied CCT measurements obtained in the different race groups.…”

Section: Discussionmentioning

confidence: 99%

A review of African studies on central corneal thickness

Rampersad

Hansraj

2016

African Vision and Eye Health

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Recently, there has been increasing interest in understanding central corneal thickness (CCT) measurements in various populations. This may be related to the influence of CCT in the diagnosis, classification and management of glaucoma. In addition, CCT measurements are also important for monitoring corneal diseases and contact lens wear, indicating the overall health of the cornea and assessing eligibility for refractive surgery. This article reviews studies that have reported CCT measurements in non-glaucomatous African sub-populations. The CCT measurements, gender associations and limitations of these studies are highlighted. The findings of these studies and their implications are discussed in relation to global studies reporting on CCT measurements.

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Comparison of corneal thickness and biomechanical properties between North African and French patients

Abstract: Corneas were thinner in North African patients than in French patients, and the CRF was different even when CCT was taken into accounted. More research is needed to determine whether these differences are associated with an additional risk for ectasia after laser in situ keratomileusis.

Cited by 14 publications

References 20 publications

<p>Corneal Ectasia Risk And Percentage Tissue Altered In Myopic Patients Presenting For Refractive Surgery</p>

<p>Corneal Ectasia Risk And Percentage Tissue Altered In Myopic Patients Presenting For Refractive Surgery</p>

Practice of orthokeratology in Algeria: a retrospective study

A review of African studies on central corneal thickness

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