How do you tell if you have a lazy eye?

Lazy eye. An eye that cannot see well despite being without disease is called amblyopic or "lazy". There are many causes, most common are strabismus (an eye that crosses) or an eye that has a worse refractive error than the other eye. It is best to get a thorough eye exam if you are suspecting a problem and get diagnosed. Lazy eye can be treated if caught early enough.
Lazy. A lazy eye tends to drift in or out when one is tired or inattentive. Ask your family and friends if they ever see your eyes drifting.