SAFETY ENGINE

Every plan — no exceptions — passes through binding safety floors before it reaches a signature. This page describes the actual numbers, because a safety claim without numbers is a slogan.

THE FLOORS, WITH THEIR VALUES

• PTA — percent tissue altered,^[1] ceiling dependent on Kmax: 40% when Kmax ≥ 46 D, 45% below; binding in the LASIK family, informational (with honest labelling) in procedures where the threshold was never validated
• RSB — residual stromal bed:^[2] 300 µm for LASIK/iLASIK/Q-LASIK; 280 µm for lenticule procedures with a 470 µm pre-op minimum; graded 300–350 µm for surface ablation depending on biomechanical evidence
• RCT — residual corneal thickness ≥ 400 µm, controlled independently: no flap choice can repair it, only reducing ablation can
• Post-op K window (Min–Max K) — a pass/fail test, from which each cornea's maximum treatable correction is computed
• Age & stability — 18 minimum (18–21 flagged for surgeon's discretion), 12-month refractive stability, medication and chronic-disease screening on every case

DISCIPLINE IN THE COUNTING

Ectasia indices are counted with correlation awareness — derived indices never masquerade as independent evidence. Missing data is never assumed normal; it is named in the report. Device floors are respected but never relied on when RLES AI's own floors are stricter: a laser that warns at 250 µm of stroma does not loosen a 300 µm rule.

WHAT THE ENGINE NEVER DOES

It never rules that surgery "cannot be done". It states which floor a plan violates and by how much, shows what parameter change would repair it, and offers the alternatives — a smaller zone, a different procedure, an ICL pathway. The verdict belongs to the surgeon; the engine's job is to make sure the verdict is informed.

FREQUENTLY ASKED QUESTIONS