Say what's on your mind — screen time, sunlight, ageing eyes, a symptom that worries you — and get one clear explanation, a few daily habits, and a line on when to book an optician.
The topic and worry above are already filled in — press “Explain it to me” and your answer appears here, with its sources listed at the end.
This reads current eye-health guidance and explains it. It cannot look at your eyes.
Every explanation ends with a Sources list, so you can see exactly where each claim came from, and a “What this is not” note. Nothing here replaces an eye test. Sudden vision loss, a curtain or shadow across your sight, flashes and floaters that have just started, eye pain with redness, or double vision are same-day reasons to get seen — not reasons to read more.