Final answer:
Ensure the client removes contact lenses before a chemical service to avoid irritation or damage to the eyes from chemicals, which can be absorbed by the lenses or trapped beneath them.
Step-by-step explanation:
Before a chemical service, it is advisable to have the client remove their contact lenses. This precaution is important because during the application of certain chemicals, such as those used in hair coloring or perming, there is a risk of skin or eye contact. If chemicals come into contact with the eyes, they can cause irritation or damage. Contact lenses can absorb these substances, potentially causing discomfort or harm to the eye. Furthermore, chemicals can also get trapped beneath the lens, prolonging exposure and increasing the risk of damage. Removing contact lenses minimizes the risk and ensures that the eyes are protected in case of accidental splashes or drips.