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