My 23-year-old son experienced sudden blurred vision and was diagnosed with Leber's hereditary optic neuropathy. What is this disease? Is it dangerous and can it cause blindness? (Anh Thu, Hanoi)

I've just recovered from pink eye, but my vision is blurry, like there's a film over my eyes. Is this dangerous, and how can it be treated? (Ngoc Lan, 32, Ho Chi Minh City)

Vision decline can be due to natural aging, but it can also signal refractive errors or cataracts.

A 61-year-old woman in Viet Xuyen commune experienced corneal burns after using custard apple seed-infused alcohol to treat head lice.