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  1. 2021年9月9日 · The procedure, called the modified Allen test, checks that blood flow to your hand is normal. In order to prepare for an arterial blood gas test, tell your doctor about all medications ...

  2. 2022年4月30日 · That's a condition in which some blood flows backward through the mitral valve with each heartbeat. Over years, moderate or severe mitral regurgitation can cause weakness of the heart muscle ...

    • Overview
    • Eye Fatigue
    • Symptoms
    • Screen & Environment
    • Habits
    • Routine

    This article is about eye fatigue, a common condition that can be caused by intense eye use and digital devices. It provides information on the symptoms of eye fatigue, how to prevent it, and what to do if the problem persists.

    Anything that requires intense eye use can cause fatigue, such as reading, writing and driving. Digital devices may also be linked to eye fatigue because you tend to blink less often when looking at a computer screen.

    Sore or irritated eyes, trouble focusing, dry or watery eyes, blurred or double vision and increased sensitivity to light are some symptoms of eye fatigue. Lack of sleep may lead to repeated eye irritation.

    Place your computer screen 20-26 inches away from your eyes and a little below eye level; regularly clean off dust and fingerprints from the surface; choose screens that tilt and swivel; use a glare filter for your screen; change lighting to get rid of glare and harsh reflections; use an adjustable chair; place a document holder next to your comput...

    Try the 20-20-20 rule every 20 minutes by looking at something about 20 feet away for 20 seconds ; post a note "Blink" on your computer as reminder ; take regular breaks from computer work .

    Apply warm washcloth soaked in warm water on tired dry eyes (keep closed) ; use artificial tears when they feel dry ; help prevent dry eyes while indoors by using air cleaner filtering dust & humidifier adding moisture .

  3. 2010年12月16日 · However, thorough studies comparing omega-3s to placebo are needed to prove this memory benefit from supplements. Huperzine A. Also known as Chinese club moss, this natural medicine works in a ...

  4. Ovulation usually happens 14 days before your next period begins, but it can vary from month to month -- even in women with regular cycles. To get a better sense of when you’re ovulating, chart ...

  5. 2022年10月18日 · ADHD affects an estimated 3% to 5% of children and adults in the U.S. Get ADD and ADHD information here including its causes, diagnosis, and promising treatments.

  6. 2023年10月31日 · Some studies show that ginseng may boost your immune system. There's some evidence that one particular type of American ginseng extract might lower the number and severity of colds in adults ...

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