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In page Conjunctivochalasis:

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Mechanical dry eye should not be confused with aqueous tear deficiency dry eye or delayed tear clearance.[1] Mechanical dry eye patients complain of blurry vision and pain that tend to be worse when looking down such as while reading. Dryness in aqueous tear deficiency dry eye patients tends to be worse as the day progresses due to progressive exposure. Frequent blinking exacerbates mechanical dry eye symptoms, while increasing blinking improves symptoms of aqueous tear deficiency dry eye.[citation needed]