Eye symptoms and vision problems

Eye symptoms can be signs of infection, irritation, or injury that has occurred directly to the eye or surrounding tissue. In other cases, the condition of your eyes can reveal an underlying health problem.

Have you noticed a change in your vision? Watch for these vision signs, symptoms, and changes.

The eye is made up of several parts. The cornea is the clear, dome-shaped surface that is the outermost layer of the eye. The retina is the light-sensitive tissue at the back of the eye. The lens focuses light onto the retina.

What is lazy eye and how does it happen? Learn more about amblyopia, the most common cause of childhood vision problems.

Learn more about strabismus, or crossed eyes, a relatively common childhood vision concern.

Both eye injury and disease can affect vision. The clarity of vision is called visual acuity, which ranges from full vision to no vision. Acuity is usually measured on a scale that compares a person's vision at 20 feet with that of some who has full acuity. Therefore, a person who has 20/20 vision sees objects 20 feet with complete clarity, but a person with 20/200 vision sees at 20 feet what a person with full acuity sees at 200 feet.