Measurements of Corneal Biomechanical Properties Using a Dynamic Scheimpflug Analyzer for Young Healthy Adults in South Korea

Yonsei University

Status: Completed

Conditions: Myopia

Treatments: Device: Dynamic Scheimpflug Analyzer

Study type: Observational

Funder types: Other

Identifiers

NCT02627157

4-2015-0944

Details and patient eligibility

About

The human cornea is affected by the magnitude and velocity of both internal and external forces because the cornea has both static and dynamic resistance components. Considering these natures of the human cornea, many investigators have tried to demonstrate corneal biomechanical properties to understand these characteristics of the cornea. Corneal biomechanical properties are known to influence the accuracy of measurements in intraocular pressure (IOP) and are recognized as important factor to explain the susceptibility of development of glaucomatous damage. Until recently, the only instrument which enabled the in vivo measurements of the ocular biomechanical properties was ocular response analyzer (ORA, Reichert Ophthalmic Instruments, Depew, NY, USA).8 The ORA has been used to assess the biomechanical properties of the cornea according to the dynamic bidirectional applanation process. A dynamic Scheimpflug analyzer (corneal visualization Scheimpflug technology [Corvis ST], OCULUS, Wetzlar, Germany) has been introduced recently and has become a useful instrument for evaluating corneal biomechanical properties. The dynamic Scheimpflug analyzer captures the dynamic process of corneal deformation caused by an air puff using an ultra-high-speed Scheimpflug camera at a rate of up to 4,330 images per second. Until now, well-organized analysis on the normative data of the corneal biomechanical profiles measured with the dynamic Scheimpflug analyzer for young healthy adults has not been reported yet. Hence, in the present study, we aim to conduct normative data analysis for the corneal biomechanical properties with the dynamic Scheimpflug analyzer in a cohort of young healthy adults in South Korea.

Enrollment: 472 patients

Sex: All

Ages: 20 to 40 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Participants will be included in analyses if they are 20 to 40 years of age
• Participants who have myopia with a spherical equivalent (SE) between 0.00 and -11.00 diopters (D)

Exclusion criteria

• Participants will be excluded from analyses if they had previous ocular or intraocular surgery, a visual field defect, suspicious optic disc appearance, IOP ≥ 30 mmHg, or presence of corneal abnormalities such as keratoconus and forme fruste keratoconus, corneal scarring that would preclude accurate measurements.

Trial design

472 participants in 1 patient group

myopia patients

Description:

20 to 40 years of age and have myopia with a spherical equivalent (SE) between 0.00 and -11.00 diopters (D)

Treatment:

Device: Dynamic Scheimpflug Analyzer