What are the requirements of a good contact lens case?

A good contact lens case should allow for total immersion of a lens, which ensures that the lenses are adequately submerged in the cleaning and storage solution. This total immersion is crucial because it helps to properly disinfect and hydrate the lenses, preventing protein and debris buildup which can lead to eye infections and discomfort. When a lens is fully immersed, the solution can effectively reach all surfaces of the lens, ensuring a thorough cleaning process.

While a quality material, like plastic, is beneficial for durability and cleanliness, and having a tight seal is important to prevent leakage and contamination, the primary requirement centers around immersion. Compact size can be practical for portability, but it is not the defining characteristic of an effective lens case regarding hygiene and lens care. Thus, total immersion is the key factor that ensures proper lens maintenance.