What is a common cause of lens discomfort during prolonged periods of reading with contact lenses?

Decreased blinking is indeed a common cause of lens discomfort during prolonged reading with contact lenses. When individuals focus intently on reading, their rate of blinking tends to decrease significantly. Blinking is essential for maintaining tear film stability, providing moisture to the surface of the eye, and removing debris. A decrease in blinking can lead to dry spots forming on the cornea, resulting in discomfort and irritation. This is especially relevant in the context of contact lens wear, as lenses can also contribute to a feeling of dryness if the tear film is not adequately replenished during extended periods of visual concentration.

The other options, while they can contribute to discomfort in various situations, are less directly linked to the specific scenario of prolonged reading. Over hydration, which refers to excess moisture in the lens, might cause issues but is not typically the foremost cause of discomfort while reading. Incorrect lens fit is definitely a concern, but it usually leads to discomfort regardless of activity, whereas decreased blinking directly correlates with the behavior of reading. High prescription can contribute to visual stress, but again, it does not specifically tie to the discomfort that arises from reduced blinking during sustained focus on text.