What is a common reason for a patient to exhibit poor vision with contact lenses?

Poor vision with contact lenses can often be attributed to incorrect lens parameters. This encompasses various aspects such as the curvature of the lenses, the base curve, the diameter, and the prescription power. If the lenses do not match the individual characteristics of the patient's eyes, such as the curvature of the cornea or the overall shape of the eye, it can lead to blurry vision, discomfort, and ineffective vision correction.

For instance, if the lens is too steep or too flat compared to the cornea, it might not fit well, leading to inadequate visual acuity. Additionally, if the prescription power does not align with the patient's refractive error due to an oversight in fitting or design, vision clarity will be compromised. Ensuring that the lens parameters are correctly aligned with the individual's needs is crucial for optimal vision and comfort.

While factors such as improper hygiene practices, aging changes in the eye, and increased reliance on visual aids can also affect vision, the primary concern in the context of poor vision specifically attributed to contact lens wear focuses on the accuracy of lens fit and prescription, making incorrect lens parameters the most direct cause.