In Pokémon Mystery Dungeon, there are Glasses that increase Stats or make the Pokémon immune to certain Status conditions when held.

List

Scope Lens

A hold item that boosts the Pokémon's critical-hit rate for moves and attacks.

Alert Glasses

Prevents held items from being stolen.

Discover Glasses

Exposes hidden items and enemies.

Insomnia Scope

Prevents wearer from being afflicted by Sleep.

Lock-On Glasses

Increases accuracy of thrown items.

New Glasses

Prevents tossed items from hitting.

Rootless Scope

Causes tossed items to change directions.

X-Ray Specs

Exposes enemies and items on every floor while worn.

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