Atacicept in Subjects With Optic Neuritis

The RNFL thickness was measured for 12 sectors (every 30 degrees) per eye in triplicate by optical coherence tomography (OCT) measurements and were then averaged over 12 sectors. The change in RNFL thickness at LOV visit was calculated as RNFL thickness at LOV minus RNFL thickness at baseline.

The RNFL thickness was measured for 12 sectors (every 30 degrees) per eye in triplicate by optical coherence tomography (OCT) measurements and was then averaged over 12 sectors. Difference was calculated as RNFL thickness in affected eye minus RNFL thickness in fellow eye.

The RNFL thickness was measured for 12 sectors (every 30 degrees) per eye in triplicate by OCT measurements and was then averaged over 12 sectors. The change in RNFL thickness at Weeks 12 and 24 was calculated as RNFL thickness at Weeks 12 and 24 minus RNFL thickness at baseline, respectively.

The change in macular thickness at 3 mm around fovea in the affected eye at Weeks 12, 24 and 36 was calculated as macular thickness at 3 mm in the affected eye at Weeks 12, 24 and 36 minus macular thickness at 3 mm in the affected eye at baseline, respectively.

The change in macular thickness at 6 mm around fovea in the affected eye at Weeks 12, 24 and 36 was calculated as macular thickness at 6 mm in the affected eye at Weeks 12, 24 and 36 minus macular thickness at 6 mm in the affected eye at baseline, respectively.

The change in macular volume in the affected eye at Weeks 12, 24 and 36 was calculated as macular volume in the affected eye at Weeks 12, 24 and 36 minus macular volume in the affected eye at baseline, respectively.

Low-contrast letter acuity was measured by using the Sloan Charts at 1.25 fraction (%) and 2.5%. Sloan letters are a set of optotypes used to test visual acuity. Total number of letters correctly identified in the affected and fellow eye were reported. The possible Sloan Chart range is 0 to 70. More the number of letters identified, better is the visual acuity.

Contrast Sensitivity was measured using the Pelli-Robson Charts. Pelli-Robson chart is used for clinical measurement of contrast sensitivity and determines the contrast required to read large letters of a fixed size. Total number of letters correctly identified in the affected and fellow eye were reported. The total possible range is 0 to 48. More the number of letters identified, better is the contrast sensitivity.

Contrast sensitivity was measured using the Pelli-Robson charts with letters arranged in groups of 3. Pelli-Robson chart is used for clinical measurement of contrast sensitivity and determines the contrast required to read large letters of a fixed size. The possible score line range is 0 (visual disability) to 16 (normal contrast sensitivity).

Conversion to CDMS was defined as experiencing a second clinical attack meeting all of the following criteria: (a) Neurological abnormality, either newly appearing or re-appearing, with abnormality specified by both (i) Neurological abnormality separated by at least 30 days from onset of a preceding clinical event, and (ii) Neurological abnormality lasting for at least 24 hours; (b) Absence of fever or known infection (fever with temperature [axillary, orally or intraauricularly] greater than 37.5 degree Celsius/99.5 degree Fahrenheit); (c) Objective neurological impairment, correlating with the participant's reported symptoms, defined as either (i) Increase in at least 1 of the functional systems of the Expanded Disability Status Score (EDSS), or (ii) Increase of the total EDSS score. EDSS assesses disability in 8 functional systems and total score ranges from 0 (normal) to 10 (death due to MS). Percentage of participants converting to CDMS (second clinical attack) was reported.