Functional Systems Scores (FSS)
Kurtzke JF. Rating neurological impairment in multiple sclerosis: an expanded disability status scale. Neurology 1983; 33: 1444-1452
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Visual Functions
| Score | Criteria |
|---|---|
| 0 | Normal |
| 1 | Scotoma with visual acuity (corrected) better than 20/30 |
| 2 | Worse eye with scotoma with maximal visual acuity (corrected) of 20/30 to 20/59 |
| 3 | Worse eye with large scotoma, or moderate decrease in fields, but with maximal visual acuity (corrected) of 20-60 to 20-99 |
| 4 | Worse eye with marked decrease in fields and maximal visual acuity (corrected) of 20/100-20/200; grade 3 plus maximal acuity of better eye 20/60 or less |
| 5 | Worse eye with maximal visual acuity (corrected) less than 20/200; grade 4 plus maximal acuity of better eye of 20/60 or less |
| 6 | Grade 5 plus maximal acuity of better eye of 20/60 or less |
| X | Added to grades 0 to 6 for presence of temporal pallor |