The eyes are the organs of vision located on the face. Eye symptoms include physical eye symptoms such as eye pain, eye itch, watery eyes, red eyes, and also various types of Vision Symptoms such as blurred vision, poor vision, visual loss, peripheral vision loss, and so on. There are numerous disorders of the eyes such as stye, conjunctivitis, eye infection, foreign body in the eye, eye injury, cataract, glaucoma, and many other eye disorders. Read more about: Eye Symptoms, Eye Disorders

   •   •   •

The function of our eyes is to allow us to see the objects in our surroundings at variable distances and under various conditions of lights. This function is achieved by a very complex arrangement of layers and structures found in the eye. In addition, two pockets of transparent fluid — the aqueous and vitreous humors — nourish eye tissues and help maintain constant eye shape.

The eye is comprised of three layers: an outer protective white coating called the sclera; a middle layer (choroid) containing blood vessels which nourish the eye; and an inner layer (retina) which contains the nerves that bear information to the brain for processing.

The cornea is the clear portion found at the front of the eye and serves to bend light rays. The iris, an extension of the choroid, is the colored portion of the eye and is made up of a spongy tissue. The pupil (black) is an opening in the iris that allows light into the eye. The lens then helps focus the light rays onto photoreceptors, which absorb and convert the light into electrical signals that carry information. The optic nerve contains fibers that transmit these signals to the brain for interpretation of the objects seen.

Source: NCBI, Genes and Disease (NCBI/NIH)1

   •   •   •

Eye: The organ of sight constituting a pair of globular organs made up of a three-layered roughly spherical structure specialized for receiving and responding to light.2

   •   •   •

Eye adverse event: An adverse event that occurs in eye.3


Types may include:4

Types of Eye:

  • Both Eyes
  • Left Eye
  • Right Eye

Anatomy Articles

Read about these related anatomy topics:

Symptom Articles

Read about these related symptoms:

Disease and Condition Articles

Read about these related conditions and diseases:

Related Symptom Topics

Read more about these related symptoms:

... More »

Related Disease and Condition Topics

Read about these diseases and medical conditions related to Eye:

... More »

   •   •   •


  1. Source: NCBI, Genes and Disease (NCBI/NIH): ncbi.nlm.nih.gov/ books/ NBK22174/ 
  2. Source: MeSH (U.S. National Library of Medicine)
  3. Source: OAE Ontology
  4. Source: NCI Thesaurus
  5. Source: MedLinePlus (NIH): medlineplus.gov/ eyediseases.html
  6. Source: NHS Choices UK: nhs.uk/ conditions/ red-eye/ 
  7. Source: MedLinePlus (NIH): medlineplus.gov/ eyeinjuries.html

   •   •   •

Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.