What is the primary function of soaking solutions for contact lenses?

The primary function of soaking solutions for contact lenses is to create a hydrophilic surface. Soaking solutions are designed to keep contact lenses hydrated and maintain their moisture level, which is crucial for comfort and optimal vision. When lenses are soaked in these solutions, they absorb water, resulting in a surface that can better attract and retain moisture. This hydrophilic property is essential because it ensures that the lenses remain comfortable when worn, reduces dryness, and helps in maintaining clarity.

The other options touch on aspects that are not the main purpose of soaking solutions. For instance, enhancing lens color, while potentially a feature in some solutions, is not a fundamental purpose related to lens maintenance or wear. Similarly, increasing lens firmness and reducing weight do not effectively address the essential needs of ensuring comfort and hydration for the wearer. Therefore, option A correctly identifies the primary functional benefit of using soaking solutions for contact lenses.