For females this would usually be finished in about 1 hour 15minutes. For males this would be finished in about 1 hour. Olympic distance triathlon (1500m / 40m bike / 10km run) For females this would take about 2 hours 25mins. For males this would take about 2 hours. Half Ironman (1.9km swim / 90km bike / 21km run) Females usually take about 5 hours 30mins.
Zinc. Night blindness may also be the result of a zinc deficiency which reduces the activity of an enzyme that helps the body produce vitamin A (retinol dehydrogenase). Research has shown that taking a zinc supplement is helpful. Healthcare providers often recommend 15 - 30 mg of zinc daily for vision.
Vitamin A. Vitamin A is vital for night vision, but it also affects tears. Lack of vitamin A damages the tear film. A prolonged deficiency causes severe dry eye, which can lead to eye ulcers, scarring and blindness, reports the Linus Pauling Institute.our diet can help prevent or treat dry eyes. Photo Credit Branislav Ostojic/Hemera/Getty Images. Lack of tears in your eyes causes dry eyes. Proteins, minerals and vitamins are all critical for making tears, which means that a lack of vitamins could increase your risk for developing dry eyes.