Eye

Definition

The eye is a complex sensory organ responsible for vision, composed of various structures including the cornea, lens, retina, and optic nerve. It is also susceptible to infections caused by various microorganisms.

5 Must Know Facts For Your Next Test

1. The conjunctiva and cornea are common sites for microbial infections in the eye.
2. Normal microbiota of the eye includes species like Staphylococcus epidermidis and Corynebacterium spp.
3. Conjunctivitis, commonly known as pink eye, can be caused by bacteria such as Haemophilus influenzae or viruses like adenovirus.
4. Keratitis is an infection of the cornea that can result from bacterial, viral, fungal, or parasitic pathogens.
5. The lacrimal apparatus produces tears that contain antimicrobial enzymes like lysozyme to protect the eye from infections.

Review Questions

• What are the common sites for microbial infections in the eye?
• Name two types of normal microbiota found in the eye.
• What is conjunctivitis and what are its common causes?

Related terms

Conjunctivitis:

An inflammation of the conjunctiva often due to infection by bacteria or viruses.

Keratitis:

An infection or inflammation of the cornea that can be caused by various pathogens.

Lacrimal Apparatus: A system responsible for tear production and drainage, playing a key role in protecting the eye from infections.