No, blind effects do not work on Olaf during the duration of his ultimate ability, Ragnarok.
Olaf's ultimate, Ragnarok (R), is a powerful ability that grants him specific immunities to various crowd control effects. For the entire duration that Ragnarok is active, Olaf becomes immune to blinds and silences.
This means that:
- Blind effects, which would normally cause basic attacks to miss, will have no impact on Olaf. His attacks will continue to hit their target.
- Silence effects, which prevent champions from casting abilities, will also not affect Olaf. He can continue to cast his spells freely.
This immunity is a core component of Olaf's kit, allowing him to disregard common forms of disruption and relentlessly pursue his targets in combat.