Five Quick Lessons on the Human Eye from Park Ophthalmology

blue eyeMost people rely on their vision as the primary sense for understanding the world around them. But human eyes are complicated with many components that must work together for the best possible vision. Dr. Beth R. Friedland of Park Ophthalmology in the Triangle area makes it her practice to educate patients about eye health and vision understanding.

Park Ophthalmology offers an outlined summary, in simple terms, of the five major aspects of the human eye and their importance to our vision:

  • Visible parts of the eye: Most people can probably name the pupil, the black circle at the center of the eye that allows light to enter. The iris is the colored portion surrounding the pupil and the white surrounding part is called the sclera. Not visible but important to vision is the cornea, a clear dome that covers the iris and pupil.
  • Lens: The lens is positioned right behind the iris and pupil. The lens serves to focus light entering through the pupil to the back of the eye.
  • Retina: The retina is a delicate membrane that covers the inside of the back of the eye. It translates light waves into electrical signals for the brain to interpret as vision. In the center of the retina is the macula, a small pit that provides the clearest central vision. Cells within the retina are called rods and cones, with rods transmitting black and white images and cones transmitting color images.
  • Optic nerve: The optic nerve is the messenger that sends the electrical impulses from the retina and macula to the brain for processing.
  • Humors: Human eyes also have two kinds of liquid, or humors, that nourish the eyes and give them shape. The aqueous humor fills in the space between the cornea and lens and the vitreous humor fills out the area between the lens and the back of the eye.

Dr. Friedland welcomes all patient questions about their vision and how human eyes work. Do not hesitate to ask questions during an annual vision examination at Park Ophthalmology.


Park Ophthalmology welcomes patients from all areas of the Triangle and offers a wide variety of specialized services including surgery for diseases of the eye, vision examinations, eye safety information, sports medicine protective eyewear and counseling, contact lenses and evaluation, and all types of ocular diagnosis and treatment. Many types of surgery are available, including cataract and laser surgery. We are here for you and your eye and overall health. Give us a call today!

This article about the vision care is brought to you by the professional team at Park Ophthalmology located in the Triangle Region of North Carolina.

The information contained in this blog article is intended solely for informational purposes and is not intended to be offered as medical advice by your Triangle Vision Specialist in Raleigh and Durham.


Park Ophthalmology

5306 NC Highway 55, Suite 102 (adjacent to the RTP/ Research Triangle Park)

Durham, NC 27713

Office: 919 544 5375

Fax: 919 544 5829


Park Ophthalmology North

6512 Six Forks Road, Suite 105

Raleigh, NC 27615

919 846 6915

Office Manager Jenny Whitman, e-mail:

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