Skip to main content
Select Source:

Vitrectomy

Vitrectomy

Definition

Vitrectomy is the surgical removal of the vitreous (transparent gel that fills the eye from the iris to the retina).

Purpose

The bulk of the contents of the eyeball is a clear jelly-like substance that is susceptible to several afflictions that impair vision by damaging its transparency.

  • Infections
  • Injuries
  • Bleeding, particularly from diabetic retinopathy
  • Blood vessels growing into the vitreous, again due to diabetes.

The retina is the light-sensitive membrane that receives images and transmits them to the brain. It covers the inside of the back of the eye. On occasion the retina will fall into the vitreous, a condition called retinal detachment. This may be due to disease in the vitreous that pulls the retina inward, small tears in the retina that allow liquid to seep behind it and push it forward, or injury to the eye that simply breaks the retina loose. It may be necessary to remove the vitreous in order to replace the retina and restore vision.

Description

Using instruments suited for microscopic surgery, the ophthalmologist (eye surgeon) penetrates the eyeball, aspirates the vitreous, and replaces it with saline. The saline replaces the vitreous at a constant pressure in order to keep the eye from collapsing. Once the saline is in place, both eyes are patched. The procedure takes two to three hours to complete.

Preparation

Because this is a major operation on the eye, the surgeon will perform a very extensive evaluation of both eyes. After looking inside with a variety of lenses, a CT, MRI, or ultrasound study may be needed. Immediately prior to the vitrectomy, the pupils will be dilated.

Aftercare

Eye drops and antibiotics are administered, and eye rest is advised until healing is completed.

Risks

Risks associated with vitrectomy are retinal detachment, bleeding, iatrogenic (medically caused) cataracts, and endophthalmitis (inflammation of the eyeball).

Normal results

Vision is restored to useful levels in two-thirds of patients.

Resources

BOOKS

O'Malley, Conor. "Vitreous." In General Ophthalmology, edited by Daniel Vaughan, 13th ed. Stamford: Appleton & Lange, 1993.

KEY TERMS

Computed tomography (CT scan) Computerized method of creating images of internal organs using x rays.

Diabetic retinopathy Disease that damages the blood vessels in the back of the eye caused by diabetes mellitus.

Endophthalmitis Inflammation of the eyeball.

Iatrogenic Inadvertently caused by medical treatment.

Magnetic resonance imaging (MRI) Computer ized method of creating images of internal organs using magnetic fields.

Saline A salt solution equivalent to that in the body0.9% salt in water.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Vitrectomy." Gale Encyclopedia of Medicine, 3rd ed.. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"Vitrectomy." Gale Encyclopedia of Medicine, 3rd ed.. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/vitrectomy

"Vitrectomy." Gale Encyclopedia of Medicine, 3rd ed.. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/vitrectomy

vitrectomy

vitrectomy (vi-trek-tŏmi) n. the removal of all or part of the vitreous humour of the eye, including vitreous haemorrhage. It is often necessary in surgery to repair a detached retina.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"vitrectomy." A Dictionary of Nursing. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"vitrectomy." A Dictionary of Nursing. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/vitrectomy

"vitrectomy." A Dictionary of Nursing. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/vitrectomy