How can a contact lens cause corneal abrasions?

A contact lens can cause corneal abrasions primarily due to improper fit, movement on the eye, or poor hygiene practices. When a contact lens does not fit properly, it may shift excessively or even become dislodged during blinking and eye movement. This movement can scrape against the corneal surface, leading to abrasions.

Additionally, if hygiene practices are lacking, the lens may accumulate debris or pathogens, increasing the risk of irritation or injury to the cornea. For instance, dirty lenses can introduce foreign particles that cause friction against the cornea or lead to infections that exacerbate corneal damage. Therefore, the relationship between contact lens fit and hygiene practices is critical in preventing corneal abrasions.

The other options also address possible issues related to contact lens wear but do not directly encapsulate how abrasions are formed. While using an expired lens solution or having lenses that are too small may present risks, they are less directly linked to the mechanical action of the lens against the cornea. Excessive eye rubbing while wearing lenses can indeed result in corneal abrasions, but this factor is more of a secondary action rather than a primary cause stemming from the lens itself. Thus, the correct answer encapsulates the direct relationship between the lens's