Which of the following deposits are soft contact lenses particularly susceptible to?

Soft contact lenses are particularly susceptible to protein deposits due to the nature of the materials used in their manufacture. Soft lenses are typically made from hydrophilic (water-attracting) polymers, which absorb water and create a moist environment. This environment is conducive for proteins found in tears, such as lysozyme, lactoferrin, and albumin, to adhere to the lens surface. As wearers blink, these proteins can build up on the lenses over time, leading to discomfort and decreased vision quality.

In contrast, while enzymes play a role in breaking down protein deposits, they do not accumulate on the lenses themselves. Surfactants are generally used in cleaning solutions to help remove deposits, but they do not adhere to the contacts to the same extent. Leukocytes, or white blood cells, are part of the immune response and do not typically accumulate on contact lenses in significant amounts compared to proteins. Thus, the correct answer reflects the common issue faced by users of soft contact lenses with protein deposits forming on the lenses.