Changes in Corneal Hysteresis After Clear Corneal Cataract Surgery

Hager, A; Loge, Kristina; Füllhas, Marc-Oliver; Schroêder, B.; Großherr, M.; Wiegand, Wolfgang

doi:10.1016/j.ajo.2007.05.023

Cited by 89 publications

(66 citation statements)

References 24 publications

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“…Prior cataract surgery was not an exclusion factor, but data were eligible only if it was acquired at least 3 months post surgery. 29 For this paper's cross-sectional analysis, we obtained data from the most recent visit. One eye was randomly selected from each subject for use in statistical analysis, unless only one eye met the criteria for a clinical diagnosis of POAG or OH, in which case that eye was included.…”

Section: Methodsmentioning

confidence: 99%

Combining corneal hysteresis with central corneal thickness and intraocular pressure for glaucoma risk assessment

Pensyl

Sullivan-Mee

Torres-Monte

et al. 2012

Eye

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Purpose To determine whether adjusting corneal hysteresis (CH) values for central corneal thickness (CCT) and intraocular pressure (IOP) improves its capability to differentiate primary open-angle glaucoma (POAG) from ocular hypertension (OH). Methods This prospective, observational, cross-sectional study included 169 eyes of 169 subjects with a diagnosis of POAG (n ¼ 81) or OH (n ¼ 88). We utilized the Ocular Response Analyzer (ORA), Pascal Dynamic Contour Tonometer (DCT), Goldmann applanation tonometer (GAT), and ORA ultrasound pachymeter to obtain CH, IOP, and CCT values. Correlational, regression, and t-test analyses were conducted before and after the sample was divided into low, intermediate, and thick CCT subgroups. Results In the full sample, CH and CCT were moderately correlated (r ¼ 0.44, Po0.001). Although both were related to diagnosis in univariate regression analysis, only CH was independently related to glaucoma diagnosis in multivariate analysis. After the sample was divided into CCT tertiles, CH was significantly lower in POAG vs OH eyes within all three CCT subgroups, and CH was the only multivariate variable that differentiated POAG from OH in each CCT subgroup. Moreover, the relationship between CH and diagnosis was more robust within the CCT subgroups compared with the full sample, suggesting that integrating CCT into CH interpretation is beneficial. Adjusting CH for IOP did not aid diagnostic precision in this study. ConclusionOur findings suggest that combining CH and CCT for glaucoma risk assessment improves diagnostic capability compared to using either factor alone. Conversely, adjusting CH for IOP provided no clear clinical benefit in this study.

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Section: Methodsmentioning

confidence: 99%

Combining corneal hysteresis with central corneal thickness and intraocular pressure for glaucoma risk assessment

Pensyl

Sullivan-Mee

Torres-Monte

et al. 2012

Eye

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Section: Discussionunclassified

“…A diminuição das propriedades biomecânicas da córnea está relacionada a dificuldade na capacidade de detectar o aumento da PIO (12,14) . Uma redução da CH e CRF foi encontrada após cirurgia da catarata, devido ao edema pós-operatório (12)(13)(14) . Em publicação recente, demonstra- (15) .Uma forma alternativa de se detectar tal aumento seria a tonometria de contorno dinâmico (PASCAL), que sofre menor influência das característi-cas da córnea por não ser necessário aplanação, mas apenas contato do sensor pressórico com a superfície (9,(16)(17) .…”

Section: Discussionunclassified

Avaliação da pressão intraocular através do ocular response analyzer antes e após cirurgia de facoemulsificação

Valbon¹,

Silva²,

Jardim³

et al. 2011

Rev. bras.oftalmol.

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“…5 Kornea biyomekani¤i kornea stromas›n› etkileyen oküler ve sistemik hastal›klarda de¤ifliklik gösterebil-mekte ve G‹B ölçümünü etkileyebilmektedir. [5][6][7][8][9][10][11][12] Bu tür hasta gruplar›nda kornean›n biyomekanik özelliklerini öl-çebilen OCA, do¤ru G‹B'in belirlenmesinde faydal› olabilmektedir. Buradan yola ç›karak, çal›flmam›zda, kornea stromas›n› etkileyen pterjiyumun kornea biyomekani¤ine etkisi incelendi.…”

Section: Giriflunclassified

“…14,20,21 Daha önce yap›lan çal›flmalarda, keratorefraktif cerrahi, glokom cerrahisi, katarakt cerrahisi gibi oküler cerrahilerin, diabetes mellitus ve romatoid artrit gibi sistemik hastal›klar›n ve keratokonus gibi korneal patolojilerin kornea biyomekani¤ine etkisi gösterilmifltir. [5][6][7][8][9][10] Pterjiyumun kornea üzerine etkisi, histolojik çal›flmalar, korneal topografi ve konfokal mikroskopi ile gösterilmifl olmas›na ra¤-men, kornea ön stromas›n› etkileyen pterjiyumun kornea biyomekani¤ine etkisi hakk›nda literatürde herhangi bir çal›flma bulunmamaktad›r. 16,17,[22][23][24][25][26][27][28] Son y›llarda Reichert, kornean›n biyomekanik özellik-lerini de¤erlendiren OCA (Reichert Corporation; Depew, USA ) cihaz›n› gelifltirdi.…”

Section: Tart›flmaunclassified

Evaluation of Corneal Biomechanical Properties Measured by Ocular Response Analyzer in Eyes with Pterygium

Kara¹,

Baz²,

Bozkurt³

et al. 2011

tjo

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ÖzetAmaç: Pterjiumlu gözlerde Oküler Cevap Analizör (OCA) ile ölçülen kornean›n biyomekanik parametrelerini de¤erlendirmek ve normal gözlerle karfl›laflt›rmak. Gereç ve Yöntem: Çal›flmaya tek tarafl› pterjiumu bulunan 42 hastan›n 84 gözü dahil edildi. Pterjiumu olan gözler çal›flma grubunu ve ayn› hastalar›n sa¤l›kl› di¤er gözleri kontrol grubunu oluflturdu. Tüm olgulara OCA ile ölçüm yap›ld›. Kornea düzeltmeli göz içi bas›nc› (G‹Bkk), korneal rezistans faktör (KRF) ve korneal histerezis (KH) de¤erleri kaydedildi. Verilerin istatistiksel analizinde ba¤›ms›z örneklem t-testi kullan›ld›. Sonuçlar: Toplam 42 hastan›n (23 kad›n, 19 erkek) yafl ortalamas› 57±11 (32-73) y›ld›. Çal›flma grubunda ortalama KH 10,4±2,0 (6,2-14,1) mmHg, KRF 10,3±1,7 (6,5-13,2) mmHg ve G‹Bkk. 15,2±4,5 (7,6-23,3) mmHg idi. Kontrol grubunda ortalama KH 10,5±2,1 (6,4-14,4) mmHg, KRF 10,5±1,7 (7,4-13,7) mmHg ve G‹Bkk. 14,9±4,7 (9,1-26,3) mmHg idi. Bu de¤erlerde, çal›flma ve kontrol grubu aras›nda anlaml› bir fark yoktu (p>0,05). SummaryPurpose: To evaluate the corneal biomechanical properties using an ocular response analyzer (ORA) in patients with pterygium and to compare them with those in healthy subjects. Material and Method:The study included 84 eyes of 42 patients with unilateral pterygium. The study group consisted of eyes with pterygium and the control group comprised the healthy fellow eyes of the same patients. ORA measurements were performed in all patients. The values of corneal-compensated intraocular pressure (IOPcc), corneal resistance factor (CRF) and corneal hysteresis (CH) were recorded. Statistical analyses were performed using a t-test for independent samples. Result: The mean age of the 42 patients (23 female, 19 male) was 57±11 (range, 32-73) years. In the study group, mean CH was 10.4±2.0 (6.2-14.1) mmHg, mean CRF was 10.3±1.7 (6.5-13.2) mmHg, and mean IOPcc was 15.2±4.5 (7.6-23.3) mmHg. In the control group, mean CH was 10.5±2.1 (6.4-14.4) mmHg, mean CRF was 10.5±1.7 (7.4-13.7) mmHg, and mean IOPcc was 14.9±4.7 (9.1-26.3) mmHg. There were no significant differences in these parameters between the study and control groups (p>0,05). Discussion: Corneal biomechanical parameters measured by ORA do not change significantly in eyes with and without pterygium. (Turk J Ophthalmol 2011; 41: 94-7)

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Changes in Corneal Hysteresis After Clear Corneal Cataract Surgery

Cited by 89 publications

References 24 publications

Combining corneal hysteresis with central corneal thickness and intraocular pressure for glaucoma risk assessment

Combining corneal hysteresis with central corneal thickness and intraocular pressure for glaucoma risk assessment

Avaliação da pressão intraocular através do ocular response analyzer antes e após cirurgia de facoemulsificação

Evaluation of Corneal Biomechanical Properties Measured by Ocular Response Analyzer in Eyes with Pterygium

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