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Elhusseiny AM, Scarcelli G, Saeedi OJ. Corneal Biomechanical Measures for Glaucoma: A Clinical Approach. Bioengineering (Basel) 2023; 10:1108. [PMID: 37892838 PMCID: PMC10604716 DOI: 10.3390/bioengineering10101108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/11/2023] [Accepted: 09/14/2023] [Indexed: 10/29/2023] Open
Abstract
Over the last two decades, there has been growing interest in assessing corneal biomechanics in different diseases, such as keratoconus, glaucoma, and corneal disorders. Given the interaction and structural continuity between the cornea and sclera, evaluating corneal biomechanics may give us further insights into the pathogenesis, diagnosis, progression, and management of glaucoma. Therefore, some authorities have recommended baseline evaluations of corneal biomechanics in all glaucoma and glaucoma suspects patients. Currently, two devices (Ocular Response Analyzer and Corneal Visualization Schiempflug Technology) are commercially available for evaluating corneal biomechanics; however, each device reports different parameters, and there is a weak to moderate agreement between the reported parameters. Studies are further limited by the inclusion of glaucoma subjects taking topical prostaglandin analogues, which may alter corneal biomechanics and contribute to contradicting results, lack of proper stratification of patients, and misinterpretation of the results based on factors that are confounded by intraocular pressure changes. This review aims to summarize the recent evidence on corneal biomechanics in glaucoma patients and insights for future studies to address the current limitations of the literature studying corneal biomechanics.
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Affiliation(s)
- Abdelrahman M. Elhusseiny
- Department of Ophthalmology, Harvey and Bernice Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA;
- Department of Ophthalmology, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Giuliano Scarcelli
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA;
- Department of Ophthalmology and Visual Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Osamah J. Saeedi
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA;
- Department of Ophthalmology and Visual Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Silva N, Ferreira A, Baptista PM, Figueiredo A, Reis R, Sampaio I, Beirão J, Vinciguerra R, Menéres P, Menéres MJ. Corneal Biomechanics for Ocular Hypertension, Primary Open-Angle Glaucoma, and Amyloidotic Glaucoma: A Comparative Study by Corvis ST. Clin Ophthalmol 2022; 16:71-83. [PMID: 35035215 PMCID: PMC8754459 DOI: 10.2147/opth.s350029] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 12/21/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND To evaluate biomechanical parameters of the cornea provided by Corvis ST in patients with ocular hypertension, primary open-angle glaucoma, and amyloidotic glaucoma and to compare with healthy controls. METHODS This was a cross-sectional study of patients with ocular hypertension, primary open-angle glaucoma, and amyloidotic glaucoma that underwent Corvis ST imaging. Primary outcome was the comparison of corneal biomechanical parameters between study groups after adjusting for age, gender, Goldmann intraocular pressure (GAT-IOP), and prostaglandin analogues medication. Secondary outcome was the comparison of different IOP measurements in each group. RESULTS One hundred and eighty-three eyes from 115 patients were included: 61 with primary open-angle glaucoma, 32 with amyloidotic glaucoma, 37 with ocular hypertension and 53 were healthy controls. Amyloidotic glaucoma group had smaller radius (p=0.025), lower deflection amplitude at highest concavity (p=0.019), and higher integrated radius (p=0.014) than controls. Ocular hypertension group had higher stiffness parameter at first applanation (p=0.043) than those with primary open-angle glaucoma, and higher stress-strain index (p=0.049) than those with amyloidotic glaucoma. Biomechanically corrected intraocular pressure was significantly lower than Goldmann intraocular pressure in group with primary open-angle glaucoma (p=0.005) and control group (p=0.013), and Goldmann intraocular pressure adjusted for pachymetry in group with primary open-angle glaucoma (p=0.01). CONCLUSION Eyes with amyloidotic glaucoma have more deformable corneas, while eyes with ocular hypertension have less deformable corneas. These findings may be linked to the susceptibility to glaucomatous damage and progression. There were significant differences between Goldmann applanation tonometry and biomechanically corrected intraocular ocular pressure provided by Corvis ST.
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Affiliation(s)
- Nisa Silva
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
| | - André Ferreira
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
- Unit of Anatomy, Department of Biomedicine, Faculty of Medicine of University of Porto, Porto, 4200-319, Portugal
| | - Pedro Manuel Baptista
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
| | - Ana Figueiredo
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
| | - Rita Reis
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
| | - Isabel Sampaio
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
| | - João Beirão
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
- Department of Ophthalmology, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, 4050-313, Portugal
| | - Riccardo Vinciguerra
- Ophthalmology Department, Humanitas San Pio X Hospital, Milan, Italy
- The School of Engineering, University of Liverpool, Liverpool, UK
| | - Pedro Menéres
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
- Department of Ophthalmology, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, 4050-313, Portugal
| | - Maria João Menéres
- Ophthalmology Department, Centro Hospitalar Universitário do Porto, Porto, 4099-001, Portugal
- Department of Ophthalmology, Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, 4050-313, Portugal
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