schirmer tests showed decreased tearing ( less than 15 mm of wetting ) in 32 of 54 eyes ( 59 % ) of a representative group of patients with corneal xerophthalmia but in only four of 60 eyes ( 7 % ) of age- , sex- , and neighborhood-matched controls ( p less than .001 ) .
C0043349
xerophthalmia
C0015392
eyes