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In page Conjunctivochalasis:

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Diagnosis can also be made by measuring the replenishment of the tear meniscus. The test can be done as follows: Apply 5 μl of fluorescein to the base of the inferior fornix, maximally deplete the lower tear meniscus by a capillary tube or Weckcel sponge, and then monitor the recovery of the tear meniscus height with or without blinking.[3] Patients with mechanical dry eye detectable within 3–8 seconds without blinking or within 0.5-1.5 seconds with blinking.[citation needed]