True or False:

1. Your eye doctor can often tell if you have high blood pressure, high cholesterol, or diabetes based on an eye exam.

2. Waking up with red eyes is normal.

3. If you wore glasses when your driver's license was issued, you must have the license changed after laser vision correction surgery or you could be issued a ticket for driving without glasses.

Answers:

1. True. Through your eyes, doctors can see how healthy your blood vessels are, which often show signs of hypertension and high cholesterol. Diabetic signifiers can appear as abnormalities in blood vessels in the retina.

2. False. Red eyes are a signal that something's wrong—anything from allergies to an infection, says American Academy of Ophthalmology clinical correspondent Marguerite McDonald, MD, FACS. Get your eyes checked to learn what the problem is and how to treat it.

3. True. It's rare that you'd be ticketed, McDonald says, but you could be. Have your driver's license updated after vision correction surgery.

Bonus Fact: According to the USDA National Nutrient Database, a cup of cooked frozen spinach has 29,811 micrograms of eye-aiding carotenoids (lutein and zeaxanthin), the highest amount found in any food.