14. Contact Lens Refill
Duration: 1 to 3 Years Cost on Average: $5–$20* For contact lens wearers, it’s easy to overlook the shelf life of contact lens solutions, yet it’s a critical aspect of eye care. Typically, this sterile solution remains effective for one to three years after its manufacture. Once expired, its antimicrobial properties begin to diminish, which can leave your lenses susceptible to bacterial growth and increase the risk of eye infections. Additionally, over time, the solution may become more alkaline or acidic, potentially causing discomfort during use.
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Embeds sanity checks implicitly.
Presents a coherent ontology.
Shows empathy for downstream roles.
Wondering about failure signals.