NCT03658239

Corneal Biomechanics Study

The Investigation of Corneal Biomechanics Through the Changes in the Intraocular Pressure

• Status: Withdrawn
• Phase: N/A
• Study type: Interventional
• Enrollment: 0 (actual)
• Sponsor: University of Rochester · Academic / Other
• Sex: All
• Age: 18 Years – 55 Years
• Healthy volunteers: Accepted

Summary

The goal of the study is to investigate relationship between the corneal response to a temporary increase in intraocular pressure and corneal mechanical properties.

Detailed description

The preliminary theoretical study in which the corneal geometry at different intraocular pressure (IOP) levels is investigated using a theoretical biomechanical cornea model found changes in both conventional refractive error (sphere and cylinder) and irregular astigmatism i.e. higher order aberrations (e.g. spherical aberration, trefoil and quadrafoil). This is due to the mechanical characteristics of the cornea determined largely by interaction between collagen fibrils organization and extrafibrillar matrix material properties. Corneal geometry and the material properties are the two main factors that contribute to the changes in corneal aberrations with IOP elevation. These aberration changes due to the variation of IOP and the material properties of the cornea can be measured routinely with corneal topography systems (UR) and Brillouin ocular scanner (MGH), respectively and can guide the investigators to study their impact on optical and biomechanical behaviors of the cornea.

Conditions

• Myopia

Interventions

Type	Name	Description
OTHER	Inversion	Inversions will be done while the subject is on the inversion table. The subject will be inverted to 135, 150 and 165 degrees. There inversion will not last longer than 3 minutes at a time. The inversion will be terminated if the subject's blood pressure drops below 50 mmHg diastolic or if the subject's blood pressure increases more than 50 mmHg systolic.

Timeline

• Start date: 2018-12-01
• Primary completion: 2019-12-01
• Completion: 2020-12-01
• First posted: 2018-09-05
• Last updated: 2020-01-29