Which micronutrient, or its precursor, is crucial for good vision mentioned regarding fennel?

Vitamin A (or beta-carotene)

Maintaining robust eye health requires a consistent supply of specific micronutrients, and fennel is noted for contributing to this requirement. Specifically, Vitamin A is highlighted as being crucial for good vision. Vitamin A is essential for the proper functioning of the retina, the light-sensitive tissue at the back of the eye, and is key to processes like vision in low light conditions. Furthermore, the text notes that beta-carotene, which the body can convert into Vitamin A, also contributes to the protective nutrient layer required for long-term visual acuity. In addition to this, the high Vitamin C content found particularly in the bulb provides antioxidant protection for the delicate structures of the eye against environmental damage.