To treat fine lines under your eyes, look for an eye cream containing retinol or peptides, which help stimulate collagen production and smooth the skin over time. For immediate plumping and hydration, ingredients like hyaluronic acid and ceramides are excellent. Since the under-eye skin is extremely delicate, choose a formula specifically designed for eyes to prevent irritation, and apply it gently using your ring finger. Start by using retinol-based creams just 2-3 nights a week to build tolerance. Lastly, always apply a broad-spectrum sunscreen daily, as protecting this sensitive area from UV damage is crucial to preventing future lines.