Which factor can lead to corneal abrasions from contact lenses?

Improper fit of contact lenses is a significant factor that can lead to corneal abrasions. When contact lenses do not fit correctly, they may move excessively on the eye, creating friction between the lens and the corneal surface. This friction can result in the superficial layer of the cornea being damaged or scraped away, leading to abrasions.

An improper fit may be due to several reasons, such as the size, shape, or design of the lens not matching the wearer's eye anatomy. Conditions like astigmatism or changes in the shape of the cornea can exacerbate this issue. Therefore, ensuring a proper fit during the fitting process is crucial for the health of the cornea and the comfort of the wearer.

In contrast, regular cleaning helps maintain lens hygiene and reduces the likelihood of infections or irritations developing. Using saline solution is also typically safe for irrigating lenses and does not contribute to corneal abrasions. Perfect alignment of the lens, assuming a proper fit, would actually reduce the risk of abrasions rather than increase it.