This tool estimates the replacement IOL to be implanted based on the in‑situ IOL, manifest refraction,
keratometry (K1/K2), cornea‑IOL distance, and a target refraction. When the current IOL is toric,
it can also compute an “optimal rotation” of the existing toric IOL (for comparison only).
Important – warnings and limitations
Decision-support tool for eye‑care professionals. It does not replace clinical examination or surgical judgment.
Simplified model (vergence conversion, ELP, PCA/SIA compensation). Differences are expected (manufacturing tolerances, decentration, tilt, postoperative rotation, etc.).
Use caution with irregular corneas, prior corneal surgery (PRK/LASIK, keratoplasty, rings), non‑keratometric astigmatism, etc.
Provided “as is” for teaching/evaluation. Without regulatory validation, it is not a medical device.
Data: computations run locally in your browser; no data are transmitted. If hosted, ensure compliance with local regulations (privacy, security).
1. Distances
Note: the expected ELP of the replacement IOL can be estimated from the A‑constant difference (see “Replacement IOL”).