Origin of the concept
NICE was proposed as a cumulative ectasia-risk index based on elevation-tomography variables for preoperative LASIK screening. The original academic work and later published clarification should be read together when evaluating its definitions and clinical scope.
Why implementation details matter
A named risk system is reproducible only when its input definitions, source displays, units, cut points, point assignments, and missing-data behavior are explicit. Substituting a different elevation location or a similarly named Pentacam field changes the implemented method.
Independent interpretation
NICE and ERSS examine overlapping clinical concerns through different variable structures. Agreement may reinforce concern; disagreement should prompt source and pattern review. Their scores should not be added together unless a separately validated method explicitly defines such a combination.
CER-AI methodology boundary
CER-AI labels its implementation as CER-AI-adapted NICE and displays the component audit separately. This educational page explains the source literature; it does not publish or alter the application's current clinical rules.
CER-AI-adapted NICE component scoring
| Input | 1 point | 2 points | 3 points |
|---|---|---|---|
| K2 | <45 D | 45–47 D | >47 D |
| Central pachymetry | >520 µm | 500–520 µm | <500 µm |
| B.Ele.Th | <=15.5 µm | >15.5 to <18 µm | >=18 µm |
| Signed I-S | <1.00 D | 1.00–1.40 D | >1.40 D |
All four source-locked numeric inputs are required. Out-of-range or missing data make NICE incomplete rather than favorable.
From NICE total to CER-AI pathway result
| Total | Category | CER-AI result |
|---|---|---|
| 4 | No NICE escalation | PASS |
| 5–8 | Caution | CAUTION |
| >=9 | Hard stop | STOP-DEFER |
NICE remains independent; its points are never added to ERSS or PS3.
Selected sources
See the complete CER-AI medical reference registry for broader context.