Applanation Free Eye Fixation: Applanation Free Eye Fixation

A unique feature of the FEMTEC laser system is its approach of an applanation free eye fixation. Due to the spherical design of the Patient Interface designed for the use with the FEMTEC imitating the natural corneal curvature, a flattening of the cornea is not required during FEMTEC procedures. The cornea is only slightly adapted to the Patient Interface’s curvature, not applanated. This configuration allows for less suction and pressure to create lasting contact between the patient's eye. The corneal architecture is only minimally affected, allowing precise lamellar cuts even in the deep stroma.

As the spherical (curved) Patient Interface of the FEMTEC workstation does not flatten the cornea, the laser’s cuts are also curved, following the stromal lamella. FEMTEC uses tracker-friendly circular patterns. The Patient Interface suction is computer-controlled.

In contrast, other femtosecond lasers require applanation of the cornea e.g. with a flat contact glass, compressing the cornea and inducing higher intraocular pressure. Central bubble layers can interfere with Excimer tracker systems. Suction is typically applied manually without system monitoring and control.