What characteristic should a well-fitted soft contact lens have during blinking?

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A well-fitted soft contact lens should completely cover the limbus during blinking for a few important reasons. The limbus is the junction between the cornea and the sclera, and its adequate coverage is essential for both aesthetic and functional purposes. When a contact lens covers the limbus, it helps maintain a stable tear film and ensures that the lens is centered correctly on the eye. Proper coverage minimizes the risk of lens movement that could compromise vision and comfort, while also helping to protect the cornea from irritation and exposure.

Furthermore, if the lens does not adequately cover the limbus, it might lead to complications such as dryness, discomfort, or even corneal abrasion, especially if movements and fluctuations in tear film occur. This characteristic is a crucial indication that the lens fits properly, providing optimal vision and comfort for the wearer, allowing for a healthy ocular environment.

The other options do not meet the criteria for a well-fitted soft contact lens. A lens that does not move at all may be too tight, potentially causing discomfort or corneal issues. A lens being 15 mm larger than the horizontal visible iris diameter (HVID) is excessive and does not reflect appropriate sizing, which can affect fit and comfort as well. Lastly, a lens

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