There’s a reason why so many people rely on a morning cup of coffee: It can help you feel awake. But sometimes it may cause less desirable side effects like caffeine-induced(咖啡因引起的) vision disturbances. Here are the reasons why caffeine can affect vision, plus how to prevent these eyesight issues.
1. You Drank Too Much Caffeine
Can too much caffeine cause blurry(模糊的) vision? ▲ Eating or drinking a moderate amount of caffeine (which, according to the Mayo Clinic, is up to 400 milligrams per day, or the caffeine in about four cups of coffee) can help you feel more awake with little to no additional symptoms, according to the University of Michigan. And while moderate caffeine intake isn’t bad for your eyes, consuming large amounts of caffeine may lead to side effects like — you guessed it — blurred vision.
The fix:Stick to moderate or low doses to avoid a caffeine vision disturbance, according to the University of Michigan.
2. Caffeine Affects Your Blood Sugar
Even moderate doses of caffeine can cause your blood sugar to rise or fall, particularly if you have diabetes(糖尿病), according to the Mayo Clinic. And shaky eyesight can be a side effect of these blood sugar fluctuations(波动), according to the Cleveland Clinic.
The fix: If caffeine regularly causes blood sugar swings and resulting vision disturbances, limit how much of the substance you drink, according to the Mayo Clinic. If you have diabetes, talk to your doctor about the best sources and dose of caffeine for you.
3. Heavy Caffeine Use May Contribute to Glaucoma(青光眼)
Research suggests long-term, heavy caffeine usage may contribute to blurry vision down the line. For instance, consuming large amounts of caffeine every day may increase your risk for glaucoma — a group of eye conditions that causes gradual vision loss in some cases.
The fix: Get regular eye exams to take care of your vision health, according to the Mayo Clinic. You can also talk to your eye doctor about whether to limit caffeine based on your eye pressure.
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