Yes, the saffron can help improve eyesight after keep eating for a certain period. The saffron is often plant in the district above 5000 meters altitude. It can improve human beings immunity after eating for a period. As we all known, it is a kind of anti-oxidant. The saffron works as "natural sunglasses" to prevent the strong sunlight to damage eyes. It also can adjust the DNA of Cell membrane fatty acid content, to make the visual content become more durable and more elasticity. Even it can prevent the content death.