The pre-ocular tear film is a complex biochemical structure produced by the lacrimal glands and epithelial cells on the ocular surface. Clinical syndromes of ocular irritation may result from deficiencies in one or more of these layers. At a recent dry eye workshop at the National Eye Institute, dry eye conditions were classified into those with adequate aqueous tear production and those with a...

medida de la AVF (2).

Schirmer's test and tear film break-up time (BUT) were studied in 56 eyes of patients with pterygium and compared with 50 eyes of normal healthy subjects representing the same age, sex and geographical distribution. Both the values were found to be significantly reduced in cases of pterygium indicating the inadequacy of tear film in these patients.

and Implications An experiment was conducted with 48 laying hens to determine the effects of high dietary contents of corn dried distiller’s grains with solubles (DDGS) on nitrogen and dry matter manure excretion as well as egg production and egg quality. Diets containing 0, 23, 46, and 69% corn DDGS were fed to laying hens for 8 weeks after an initial 4-weeklong transition period during which ...

OBJECTIVES To clarify the relation between the prevalence of dry eye syndrome and subjective symptoms of asthenopia in visual display terminal (VDT) operators. METHOD 722 VDT workers (242 subject workers with symptoms of asthenopia and 480 controls without such symptoms) without obvious organic ocular diseases received an ophthalmological examination consisting of refractometry and a tear fun...