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Lid tone

The underlying resting tone of the eyelid, which is assessed through various tests such as the snap-back test or distraction test. A weakened lid tone can be a result of various factors such as orbicularis weakness or a dehisced lateral canthal tendon. An eyelid with a weak lid tone results in decreased function of the eyelid, leading to various conditions such as eyelid malpositions including ectropion, entropion, lower eyelid retraction, poor lid closure or blink mechanism, or even tearing.

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