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Soft Contact Lens Complications Practice Test

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What are the consequences of tight lens syndrome?
Correct Answer:
No movement = no tear exchange, resulting in conjunctival blanch and congestion; conjunctival drag
Explanation:
Tight lens syndrome happens when a contact lens fits so tightly that it doesn’t move with the eye. Movement is key for refreshing the tear layer under the lens and bringing in oxygen to the cornea. When the lens barely moves, tear exchange under the lens is reduced, which stresses the ocular surface and vessels. This mechanical compression of the conjunctiva can cause blanching (a pale appearance) and congestion (redness) from altered blood flow under the lens. At the same time, the lack of movement and the tight fit create friction between the conjunctiva and the lens as the eye moves, leading to conjunctival drag. So the combination of no movement, reduced tear exchange, and the resulting vascular changes and friction best describes tight lens syndrome.

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