を見るまでは

until seeing

→ を
phrase Rare #38,055
until seeing Used after a noun or noun phrase to mean “until [someone] sees or looks at it.” The は adds emphasis to the point in time when the action occurs.
JA: この映画を見るまでは、結末を知りたくない。
EN: Until I see this movie, I don't want to know the ending.

を見るまでは私は強かった

I was strong until I saw him.

検死報告を見るまでは私はこれサインはしない

I’m not signing off on this until I see the autopsy report.

— Article 15 (2019)

私は注射器を見るまでは平気だった

I was fine until I saw the syringe.