Results from the use of Corvis ST Device and femtosecond laser, and comparing the incidence of corneal edema

Corneal biomechanics examination using Corvis ST device and femtosecond laser corneal cleansing and also comparing the incidence of corneal edema between diabetic and non-diabetic people

Materials and methods: The Corvis ST uses a high-speed Scheimpflug camera that captures cross-sectional images of the cornea during the reshaping process. After a steady puff of air, the cornea moves inward and reaches its maximum deformation, and then returns to its previous position. In 31 consecutive minutes, consecutive imaging of the cornea and cross-sectional profiles of the posterior and anterior surfaces are performed during the application of external dynamic air pressure.

In the femtosecond method, the patient's head, eyes, or body remain immobile and the patient is placed behind the head only during surgery.

Discussion: Corvis ST is not reliable in measuring the highest concavity peak distance (HCPD). With the information obtained from this device, a distinction is made between the effects of intraocular pressure (IOP) and corneal biomechanics on corneal deformation. Among the biomechanical parameters, A1T and highest concavity (HCR) showed a good ability to detect keratoconus.

No significant differences were observed between men and women for any of the biomechanical parameters. Age was positively correlated with A1DA, A2DA, and the highest concavity deformation amplitude (HCDA). The cornea is more closely related to collagen fibers and becomes harder with age.

CVS-IOP error increased significantly with higher CCT

The use of femtosecond laser does not reduce the patient's vision we only have bad burns due to laser scattering, but its focus has increased compared to older methods such as traditional surgeries.

After phacoemulsification, patients with diabetes were 3.5 times more likely to develop severe corneal edema than non-diabetics.