RESUMEN
Myopia is the most important cause of visual impairment in adolescents. However, its etiology is complex. In recent years, a large number of epidemiological studies have been done on risk factors of myopia. Most of these studies is cross- sectional study, not longitudinal cohort study. Overall, the incidence of myopia is the result of the interaction between genetic susceptibility and environmental exposure. This review is about the risk factors for myopia.
RESUMEN
<p><b>OBJECTIVE</b>To study the chemical constituents in the total saponin from Trigonellf foenum-graecum.</p><p><b>METHOD</b>The compounds were isolated by column chromatography on macroporous resin and silica gel and elucidated by physical and chemical evidences and spectroscopic analysis.</p><p><b>RESULT</b>Two compounds were obtained and identifiedas methyl-protodioscin and methyl-protodeltonin.</p><p><b>CONCLUSION</b>Methyl-protodioscin and methyl-protodeltonin were isolated from this plant for the first time.</p>