Lens-Maker's Glasses

The Lens-Maker's Glasses is a item in Risk of Rain, increasing your chance to critically strike by 7%*. When picked up, a red cross/plus sign will hang over your character's head.

When an attack critically strikes, it will make a sharp noise, and the damage text will be emboldened with a red outline.

Explanation about Stacking & Crit Chance
Each stack of linearly increases your critical chance by 7%. Normally, having at most 14 stacks of this item will guarantee you 100% critical chance:
 * Every character starts with 1% crit chance at the beginning.
 * All crit chance increasing items, including (+5%),  (+5%),  (+6%), and  (+7%), additively contribute to the crit chance together.
 * Although the value of crit chance is not capped, crit chance has no effect beyond 100%.


 * If no other crit chance increasing item has been picked already, picking up a will raise crit chance by 10% (as what the in-game item description says) instead of 7%. Otherwise, picking up the first  will only give you 7%.

All of this translates into:
 * If is the only crit-enhancing item that has been collected in the run, the crit chance on 14 stacks would be: 1% + (10% × 1) + (7% × 13) = 102% ➙ 100%.
 * If at least one of the other crit-enhancing items has been collected before the 1st pair of glasses, the minimum crit chance on 14 stacks would be: 1% + >5% + (7% × 14) = 104% ➙ 100%.

Item Synergies

 * Harvester's Scythe: Heals you each time you crit, as well as boosting your crit a small amount.
 * Predatory Instincts: Gives you bonus attack speed each time you crit, as well as boosting your crit by a small amount.
 * Wicked Ring: Reduces your cooldowns by one second each time you crit as well as boosting your crit chance.
 * Frost Relic: The icicles that spawn after you kill an enemy from Frost Relic can crit.
 * Brilliant Behemoth: The explosions can crit.

Trivia

 * The mailing location, Grievenkamp, is a reference to John E. Grievenkamp, an optical scientist.
 * The old crit chance stacking was: (1 - (0.9)^x)*100, while x is the number of stacks. This formula worked in an unknown old patch, and has been since changed, there is no information if this was a bug or if it was a untold test.

es:Lens-Maker's Glasses