Certified Ophthalmic Assistant Practice Exam

A common disadvantage of chemical-based contact lens care systems is that they can cause irritation. This irritation can arise from the preservatives used in these systems, which may not be suitable for every individual's eyes and can lead to discomfort or allergic reactions. Some users might experience redness, burning, or stinging sensations after using chemical disinfectants. While other factors such as cost, the risk of infection, and difficulty in application can also play a role in the choice of contact lens care systems, they do not specifically highlight the unique concern related to irritation caused by chemical ingredients. For example, the financial aspect of these systems can vary greatly and isn't universally recognized as a disadvantage. Likewise, if used properly, the risk of infection is typically mitigated by following appropriate guidelines for lens care. Finally, difficulty in application often pertains more to the user's skill with lens handling rather than the chemical nature of the care products themselves. Thus, irritation stands out distinctly as a direct drawback associated with chemical-based systems.