Vision Care Glossary

Definitions of Eye Care and Vision Terms

Vision Care Glossary in PRIMARYCITY

The Layperson's Guide to Vision Terminology

The following article will provide definitions and explanations to clarify basic terminology of standard eye care and vision-related services. It is not intended to be used as a diagnostic tool, or as a replacement for a comprehensive eye examination or treatment. Always contact an optometrist for any signs or symptoms of eye injury, trauma, infection, or visual-motor, neurological complications.

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Anatomy of an Eye: Key Terms for Parts of the Eye

The basic parts of the eyeball include the following:

  • Cones: Cones and rods comprise the photoreceptor. Cones are primarily found in the macula and are responsible for clarity of vision, color, and central vision.
  • Conjunctiva: Lines the inner eyelid and the eyeball, and acts as a barrier from foreign substances.
  • Cornea: Clear section of the front of the eye, that directs light into the eye and is responsible for most of our ability to focus.
  • Eyelids: The outer flaps of skin covering and protecting the eyeball. Composed of upper and lower lids.
  • Eye: General term for the entire organ of vision.
  • Iris: The colored region of the eye surrounding the pupil.
  • Lacrimal Gland: Critical for the formation of tears.
  • Lens: The region of the eye responsible for sending light to the retina.
  • Macula: Small region of the eye that aids in our sharp central vision.
  • Optic nerve: A group of nerves responsible for sending messages from the eye to the brain.
  • Orbit: The bony structure housing the eyeball.
  • Pupil: The black part of the eye, which acts as a corridor for light to the retina. Changes size depending on the amount of light.
  • Retina: Region at the part of the eye that detects light.
  • Rods: Light-sensitive detectors responsible for peripheral and night vision. Rods and cones make up the photoreceptors.
  • Sclera: The white fibrous outer layer of the eyeball.

  • Diabetes: A disease where the body is unable to produce the right amount of insulin or how is unable to use it effectively. Many of the serious effects of diabetes involve ocular complications which can lead to loss of vision. There is a higher prevalence among people of certain ethnic groups, heavy smokers and drinkers, and those with high blood pressure for developing diabetes.
  • Diabetic Retinopathy: One of the disorders of diabetes leading to damaged eyesight.
  • Diplopia: Also known as double vision, which can either be binocular or monocular. Caused by dry eyes, diabetes, a dislocated lens, astigmatism, hyperthyroidism (binocular form). Treatment is usually focused on the underlying condition.
  • Dry Eye Syndrome: This can be caused by several factors including the inability to produce enough tears to lubricate and moisturize the eye.
  • Floaters: These "floating spots" appear across the field of vision and are formed from the vitreous gel of the eye. Most instances are normal but they can occasionally be signs of a more serious issue. Speak to your optometrist if you notice them.
  • Glaucoma: Complications involving damage to the optic nerve from excessive eye pressure cause this degenerative eye condition. Early detection is critical to prevent degeneration. Easily and painlessly diagnosed.
  • Hypertension: Also known as high blood pressure, this is a contributing factor to eye disorders due to damage to blood vessels near the eye.
  • Macular degeneration: This leading cause of a loss of vision in seniors occurs from the erosion of the macula.
  • Myopia: Another term for the condition known as near-sightedness.
  • Retinal Detachment: This emergency condition occurs when the retina detaches from the eye. Surgical intervention is required. Warning signs include the sudden appearance of many floaters, blurred vision, and flashes of light. They can be caused by age, fluid buildup, or scar tissue. Those predisposed include previous occurrences, family history, myopia, and other visual disorders.
  • Strabismus: Also known as cross-eyes, it is very common among children. corrective measures include surgery and prescription lenses.
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We hope that this glossary of vision care was helpful. No list can be used as a replacement for professional examinations and treatment. Always contact an optometrist if you experience any symptoms of eye injury, infection, or visual motor complications. For more information on general eye care, speak with your optometrist to schedule an appointment. You can schedule an eye exam with our eye doctor by calling 111-222-3333.

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