The Valve Index Gets The iFixit Teardown Treatment! - YouTube
KIWI design Lens Protector Cover Accessories, Compatible with Quest 2, Quest Pro, Quest, Rift S, Valve Index, Pico 4 and HP Reverb G2 (Classic): Amazon.co.uk: PC & Video Games
I replaced the Valve Index's Lenses - no more glare, alas a bit of distortion and reduced FOV | Tyler Lindell - Like Ginkgo for your Virtual Self
Valve Index Headset - iFixit
Valve Index Interface & Foam Replacement Basic Set