Lens-Maker's Glasses

Not to be confused with Lens-Maker's Glasses (Risk of Rain 2).

Explanation about Stacking & Crit Chance
Each stack of linearly increases critical hit chance by 7%. Normally, having at most 14 stacks of this item will grant 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 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

 * : Heals the player each time they crit and boosts their crit a small amount.
 * : Gives bonus attack speed each time attacks crit, and boosts crit by a small amount.
 * : Reduces cooldowns by one second each time attacks crit, and boosts crit chance.
 * : The icicles that spawn after an enemy is killed can crit.
 * : The explosions can crit.
 * : The damage that this item bases on are the actual final damage dealt, so the crit damage will be the basis for the damage output of each missile. ( works differently.)
 * , : Same reasoning as.

Trivia

 * On successful critical strike, it will make a sharp noise and the damage text will be emboldened in red.
 * 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 an untold test.
 * Getting this item makes a red star shape appear above the player character.