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We measured the contents of brain-derived neurotrophic factor (BDNF) in the lacrimal fluid, aqueous humor, and blood serum in 40 patients (40 eyes) with age-related cataracts. Collection of stimulated lacrimal fluid was performed by a pipette on the day preceding surgery; the aqueous humor and the blood were sampled during the phacoemulsification of a cataract. BDNF was measured using an enzyme immunoassay...
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