Nuclear sclerotic (NS)
 |
| Best graded with slit beam at 30 to 45 degree angle to the cataract. |
NS tr or 1+: Nucleus clearer than anterior/posterior sections
NS 2+: Nucleus equal to the anterior/posterior sections (same opacity level throughout)
NS 3+ Nucleus denser than anterior/posterior sections
NS 4+ Brunescent: Cataract completely opaque/brown
Cortical spoking (CS)
 |
| Best graded while visualizing with retroillumination. |
CS 1+: ⅛ to ¼ of the total area
CS 2+: ¼ to ½ of the total area
CS 3+: ½ or more of the total area
Posterior subcapsular cataract (PSC)
 |
| best graded while visualizing with retroillumination..WHO criteria, graded on vertical height (in mm) |
PSC 1+: 1 mm to 2 mm
PSC 2+: 2 mm to 3 mm
PSC 3+: >3 mm
These basic measurements are combined into a cataract grade. You can have multiple types of cataracts at once and this can be written as the following:
OD: 2+ NS, 2+ CS, 1+ PSC
OS: 2+ NS, 1+ CS
Source:WHO published a simplified cataract grading scale,2002
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