Fluorescein formulations and kits

A kit comprising:

• an aqueous formulation comprising from about 50 mg/mL to about 300 mg/mL fluorescein sodium, wherein the formulation has a pH of from about 8 to about 10;
• and
• a glass vial holding the aqueous formulation, where the glass vial comprises a shoulder portion that interconnects a neck portion and a body portion, wherein the shoulder portion includes a frustoconical shoulder wall that extends toward the body portion at a transition angle (β) of at least 120°,
• wherein the aqueous formulation has a dissolved silicon concentration upon filling the glass vial (Si0w), and a dissolved silicon concentration after storage in the glass vial at 60° C. for 10 weeks (Si10w), wherein Si10w/Si0w is from 1 to 1.6;
• the aqueous formulation has a dissolved boron concentration upon filing the glass vial (B0w), and a dissolved boron concentration after storage in the glass vial at 60° C. for 10 weeks (B10w), wherein B10w/B0w is from 1 to 1.9;
• Si10w is less than 14 mg/L;
• and
• B10w is less than 2.2 mg/L.