Changes in Corneal Biomechanics and Intraocular Pressure Following LASIK Using Static, Dynamic, and Noncontact Tonometry

Pepose, Jay S.; Feigenbaum, Susan K.; Qazi, Mujtaba A.; Sanderson, Jeffrey P.; Roberts, Cynthia J.

doi:10.1016/j.ajo.2006.09.036

Cited by 327 publications

(271 citation statements)

References 33 publications

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“…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

“…Além das medidas pressóricas, IOPg e IOPcc, o ORA determina a histerese corneana (CH -Corneal Hysteresis) que é um parâmetro relacionado com a visco-elasticidade da córnea e o fator de resistência corneana (CRF -Corneal Resistance Factor) (6)(7)(8)(9) .…”

Section: Discussionunclassified

“…Além da medida da PIO calibrada de acordo com o "padrão ouro", TAG (IOPg -gold standard, Goldmann correlated Intraocular pressure), existe um cálculo para determinar uma pressão compensada da córnea de acordo com as propriedades biomecânicas encontradas (IOPcc -corneal compensated Intraocular pressure). Além das medidas pressóricas, IOPg e IOPcc, o ORA determina a histerese corneana (CH -Corneal Hysteresis) que é um parâmetro relacionado com a viscoelasticidade da córnea e o fator de resistência corneana (CRF -Corneal Resistance Factor) (6)(7)(8)(9) . …”

Section: Introductionunclassified

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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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Section: Discussionunclassified

Section: Introductionunclassified

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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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“…[1][2][3] To our knowledge, this is the first report to evaluate the biomechanical changes of the cornea after PTK. This assessment is clinically important for the dissemination of this surgical technique, especially in consideration of the occurrence of iatrogenic keratectasia in post-PTK eyes.…”

Section: Discussionmentioning

confidence: 99%

“…Actually, it has been shown that the corneal biomechanical parameters were significantly decreased after LASIK. [1][2][3] Although PTK usually requires less laser ablation of the corneal stroma than is needed by other excimer laser surgery, the biomechanics of the cornea before PTK may have already been more affected by histopathological deformation than that of normal eyes before keratorefractive surgery. In addition, the presence of iatrogenic ectasia after PTK has also been documented.…”

Section: Introductionmentioning

confidence: 99%

The changes in corneal biomechanical parameters after phototherapeutic keratectomy in eyes with granular corneal dystrophy

Kamiya

Shimizu

Ohmoto

2008

Eye

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Purpose To assess corneal biomechanical changes in eyes undergoing phototherapeutic keratectomy (PTK) and to investigate the relationship of PTK with corneal thickness. Methods We examined 36 eyes of 23 patients undergoing PTK for the treatment of granular corneal dystrophy (GCD). Corneal hysteresis (CH) and corneal resistance factor (CRF) were measured with an Ocular Response Analyzer TM before and 3 months after surgery. We also investigated the relationships between corneal biomechanical parameters and central corneal thickness before and after surgery. Results The CH was significantly decreased from 10.2 ± 2.2 to 8.7 ± 1.8 mm Hg after PTK (Wilcoxon signed-rank test, Po0.001), as was the CRF, from 10.3±2.0 to 8.5±1.8 mm Hg (Po0.001). We found a significant correlation between both CH and CRF and the central corneal thickness before surgery (Pearson correlation coefficient r ¼ 0.37, P ¼ 0.03 for CH, r ¼ 0.51, P ¼ 0.002 for CRF) and 3 months after surgery (r ¼ 0.54, P ¼ 0.001 for CH, r ¼ 0.74, Po0.001 for CRF). Conclusions PTK induces a significant decrease in the biomechanical parameters of the cornea. The corneal thickness may play some role in corneal biomechanics even in eyes with GCD.

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Corneal Thickness and Intraocular Pressure in a Nonglaucomatous Burmese Population

Casson¹

2008

Arch Ophthalmol

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Objective: To determine correlates of central corneal thickness (CCT) and its relationship to intraocular pressure (IOP) in a Burmese population. Methods: We performed a population-based survey of inhabitants 40 years or older in Myanmar; of 2076 participants, data from 1909 nonglaucomatous subjects who underwent ultrasound pachymetry and Goldmann applanation tonometry were analyzed. Linear mixed effects models adjusting for nonindependence of right and left eye data were constructed. Results: Mean (SD) CCT was 521.9 (33.3) µm, and the mean (SD) IOP was 14.5 (3.4) mm Hg. Intraocular pressure and spherical equivalent were significant predictors of CCT (PϽ.001 and P=.01, respectively). Age, sex, body mass index, and corneal curvature were not significant pre-dictors. Central corneal thickness was the only significant predictor of IOP (ie, an increase of 100 µm in CCT predicted an increase of 1.3 mm Hg in IOP). The Spearman correlation between CCT and IOP for the right and left eyes was highly significant (PϽ.001), but the Spearman rank correlation values (R 2 =0.016 and R 2 =0.017, respectively) were weak. Conclusions: The CCT in this Burmese population was significantly associated with IOP and spherical equivalent. The weak association between CCT and IOP is consistent with that of other population-based studies. Other corneal factors are likely to influence Goldmann applanation tonometry.

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Changes in Corneal Biomechanics and Intraocular Pressure Following LASIK Using Static, Dynamic, and Noncontact Tonometry

Cited by 327 publications

References 33 publications

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

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

The changes in corneal biomechanical parameters after phototherapeutic keratectomy in eyes with granular corneal dystrophy

Corneal Thickness and Intraocular Pressure in a Nonglaucomatous Burmese Population

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