Change in optic nerve conduction velocity (NCV) at Week 24 for the affected eye from the baseline of unaffected fellow eye as determined by full-field visual evoked potential (FF-VEP). 24 weeks [clinicaltrials_resource:a505fb360e70e75124b8dfb0c3f53472]

One pre-dose PK sample and 1 post-dose PK sample (approximately between 1 and 3 hours after the end of IV infusion) will be collected for ALL participants on Day 1 and at Weeks 4 through 20 (every 4 weeks). Additionally, only 1 PK sample will be collected at Week 24 and Week 32.

Change in optic nerve conduction velocity (NCV) at Week 24 for the affected eye from the baseline of unaffected fellow eye as determined by full-field visual evoked potential (FF-VEP). 24 weeks [clinicaltrials_resource:a505fb360e70e75124b8dfb0c3f53472]

One pre-dose PK sample and 1 post-dose PK sample (approximately between 1 and 3 hours after the end of IV infusion) will be collected for ALL participants on Day 1 and at Weeks 4 through 20 (every 4 weeks). Additionally, only 1 PK sample will be collected at Week 24 and Week 32.