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Corneal biomechanical properties in myopic anisometropia measured by corneal visualization scheimpflug technology
Hui Shao1, Qing Zhu1, Lina Zhang1
1Department of Ophthalmology, The Sixth Affiliated Hospital of Wenzhou Medical University (The People' Hospital of Lishui) Lishui, Zhejiang, China.
Objective:
To explore corneal biomechanical properties in patients with myopic anisometropia using a corneal visualization scheimpflug technology (Corvis ST).
Methods:
We examined 102 eyes from 51 adults with anisometropia (minimum spherical equivalent (SE) of 2.50 D). Patients were classified into two groups based on their SE: high myopia (SE ≥ -6.00 D) (n=52 eyes) and non-high myopia group (SE ≤ -6.00 D) (n=50 eyes). Corneal biomechanical and ocular biometric parameters were measured.
Results:
In the high myopia group, axial length (AL), anterior chamber depth (ACD), and central corneal thickness (CCT) were significantly higher compared to the non-high myopia group (all P < 0.001). The second applanation time (A2-time), length of flattened cornea at second applanation (A2-length), and time to highest concavity (HC-time) were shorter in the high myopia group (all P < 0.001). The high myopia group also exhibited lower elasticity and rigidity indices, higher EAI (all P < 0.001), and greater central/mid-peripheral deformation amplitudes (both P < 0.001), with minimal peripheral differences (P=0.074).
Conclusion:
CorVis ST provides a reliable method for measuring corneal biomechanical properties. In anisometropia, eyes with higher myopia show higher deformation amplitude, faster A2-velocity, shorter A2-time and HC-time, and reduced A2-length.
