Table 1 of Lin, Mol Vis 2010; 16:1206-1214. Table 1 of Lin, Mol Vis 2010; 16:1206-1214.
Table 1. Lens opacities classification (LOC) system defines the extent of opacification of lens.
| Parameter | Features | Grade |
|---|---|---|
| Nuclear color (NC) | The color of the posterior cortical/posterior subcapsular reflex is: | |
| <NI standard | NC0 | |
| Similar to the NI standard | NC1 | |
| >NI standard | NC2 | |
| Nuclear opalescence (N) | The average opalescence of the nucleus is: | |
| <=that in N0 | N0 | |
| >N0 but <=NI | NI | |
| >NI but <=NII | NII | |
| >NII but <=NIII | NIII | |
| >NIII | NIV | |
| Cortical cataract (C) | The aggregate extent of linearly organized or clustered opacities is: | |
| <=that in C0 | C0 | |
| >C0 but <=Ctr (trace) | Ctr | |
| >Ctr but <=CI | CI | |
| >Ctr but <=CII | CII | |
| >Ctr but <=CIII | CIII | |
| >Ctr but <=CIV | CIV | |
| >CIV | CV | |
| Posterior subcapsular (P) | The aggregate extent of the axial opacity seen in retro-illumination is: | |
| <=that in P0 | P0 | |
| >P0 but <=PI | PI | |
| >PI but <=PII | PII | |
| >PII but <=PIII | PIII | |
| >PIII | PIV |