Marfan syndrome, a connective tissue disorder, can affect almost any part of your body, including your heart, eyes and ligaments.
Most headaches aren't caused by a serious illness, but some could be a sign of a life-threatening condition.
Foot pain? Headache? Sore throat? Skin rash? Use the Symptom Checker to find out what's causing your symptom.
Tests and diagnosis
Eye exam — Overview covers definition, what to expect and results of vision testing.
Treatments and drugs
Think LASIK might free you from glasses? Here's help understanding whether the procedure makes sense for you.
Thinking about trying contact lenses? Here's an overview of the basic choices — plus tips to keep you seeing clearly.
LASIK eye surgery — Overview covers definition, risks, what to expect from vision correction surgery.
March 04, 2015
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