A corneal onlay is an investigational concept where a thin device is placed on or just under the corneal surface to change its optics. It differs from inlays mainly in position and integration with the cornea.
Concept
Onlays aim to avoid deep stromal implantation by sitting more superficially, potentially easing removal or exchange. Designs include refractive, diffractive, or therapeutic layers.
- Most corneal onlay technologies remain experimental or limited in availability
- Applications could include refractive correction or drug delivery
- Challenges involve epithelial healing, stability, and optical quality
- Current mainstream refractive surgery relies more on laser reshaping or inlays
Current Status
Because of limited long‑term data, corneal onlays are not widely used in routine clinical practice. Patients interested in such technologies are usually enrolled in clinical trials.
- Careful informed consent and monitoring are essential in research settings
- Alternative established options for refractive or therapeutic needs are usually preferred
- Future advances may refine materials and integration to expand clinical use
- Discussion with a corneal specialist can clarify locally available options
