Corneal Biomechanics Differences Between Chinese and Caucasian Healthy Subjects

Area of Science:

• Ophthalmology
• Biomechanical Engineering
• Medical Imaging

Background:

• Corneal biomechanics are crucial for understanding ocular health and disease.
• The Corvis ST provides dynamic corneal response parameters (DCRs) for in-vivo assessment.
• Ethnic variations in corneal properties may influence DCRs.

Purpose of the Study:

• To investigate and compare dynamic corneal response parameters (DCRs) between healthy Caucasian and Chinese subjects using the Corvis ST.
• To identify specific DCRs that exhibit significant differences between these ethnic groups.

Main Methods:

• A multicenter retrospective study included 2889 healthy subjects (Caucasian and Chinese).
• Chinese eyes were matched to Caucasian eyes based on age, intraocular pressure (IOP), and corneal thickness (CCT).
• Assessed DCRs included Deformation Amplitude (DA), Applanation 1 velocity (A1v), integrated radius (1/R), deformation amplitude ratio (DAratio), stiffness parameter at applanation 1 (SPA1), Ambrósio's Relational Thickness (Arth), and Stress Strain Index (SSI).

Main Results:

• After matching, 503 Chinese subjects were compared with 452 Caucasian subjects.
• Significant differences were observed in SPA1 (p=0.008), Arth (p=0.008), and SSI (p<0.001) between the groups.
• DA, A1v, DAratio, and 1/R showed no significant ethnic differences (p>0.05).

Conclusions:

• Significant ethnic differences exist in specific Corvis ST dynamic corneal response parameters between healthy Chinese and Caucasian subjects.
• SPA1, Arth, and SSI are potential indicators of ethnic variations in corneal biomechanics.
• Further research is warranted to understand the clinical implications of these ethnic differences.