The claim that some shampoos do not sting the eyes if they come in contact with them is not always true. Many products that are marketed as "tear-free" can still cause irritation, especially if they are used in large amounts or if the person using them is particularly sensitive.

Formulas of traditional shampoos include various surfactants such as sodium lauryl sulfate (SLS), which effectively remove dirt and oil but can also be irritating to the eyes. In contrast, tear-free shampoos are designed to minimize eye irritation by using milder surfactants, such as sodium lauryl glucose carboxylate (SLGC) or cocamidopropyl betaine (CAPB). These surfactants are considered less harsh and less likely to cause tears or discomfort when they come into contact with the eyes.

However, it's essential to note that individual sensitivity can vary, and some people may still experience eye irritation even with tear-free shampoos. If you are concerned about eye irritation, consider testing the shampoo on a small area of your skin or scalp before using it fully. If you experience any irritation or discomfort, avoid using the shampoo near your eyes or rinse your eyes thoroughly with clean water.

Additionally, it's always advisable to follow the usage instructions provided by the shampoo manufacturer and avoid getting any shampoo, regardless of its tear-free claim, into your eyes. In case of accidental contact, rinse your eyes thoroughly with water. If any discomfort persists, consult with a healthcare professional.