Abstract
The dual-plane technique is an effective and safe method that aims to correct sunken upper eyelid deformity by increasing the volume of retro-orbicularis oculi fat, and especially supraorbital fat, through hyaluronic acid filler injection. Filling in the superficial plane allows for a more precise correction of sunken upper eyelid deformity with a smaller amount of filler. Contrary to common knowledge in the literature, this technique-filling the superficial plane with a filler, such as subcutaneous fat-does not lead to irregular filler accumulation and surface irregularity on the skin. Additionally, the risk of complications is much lower compared with techniques that recommend filling the deep plane using a sharp needle.