Which of the following is NOT a function of the eyelids?

The functions of the eyelids primarily revolve around protecting the eye, maintaining moisture, and promoting overall eye health. One key role is the distribution of tears across the surface of the eye, providing lubrication and facilitating clear vision. The eyelids also serve to protect the eyes from potential threats, whether that be physical injury from foreign objects or excessive light. Additionally, they help flush away debris and keep the ocular surface clean, supporting optimal visual function.

The option mentioning enhancing color perception is not a recognized function of the eyelids. Instead, color perception is primarily a function of the retina in the eye, particularly involving cone photoreceptors that are responsible for detecting color. The eyelids do not influence color perception; rather, they support the eye's health and function in other, more protective and maintenance-oriented ways.