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Chapter 16 Ophthalmic Surgery study guide
Surgical Technology Study Guide Chapter 16
Terms in this set (64)
a suture passed beneath the superior rectus muscle to rotate the globe downward in eye surgery.
Acetylcholine is an organic chemical that functions in the brain and body of many types of animals, including humans, as a neurotransmitter—a chemical released by nerve cells to send signals to other cells.
the mucous membrane that covers the front of the eye and lines the inside of the eyelids.
Castroviejo needle holder
Has delicate tips that are ideal for the placement of small needles that are easily crushed. In neurosurgical, plastic, cardiovascular and eye sets.
- commonly used in eye surgery and microsurgery
Used for holding fine suture needles in eye procedures.
Shaped exactly like a #15 blade but much smaller and only used with a beaver handle
balanced salt solution (BSS)
a solution used for eye irrigation is
Isotonic solution - prevents corneal dryness.
Used to keep tissues of the eye from drying out during a procedure
Fenestration surrounded by an adhesive backing
Small clear plastic drapes with an opening and adhesive backing
commonly used during eye surgery
Split drape (U-drape)
A long, transparent plastic U-drape, used to isolate the contaminated areas from the sterile field.
Cartilage plate forming the eyelids
provides rigidity to the tarsal eyelids
small, hard tumor developing on the eyelid, somewhat similar to a sebaceous cyst
angle where the upper and lower eyelids meet
inversion, or inward turning, of the edge of the lower eyelid
the surgical removal of a portion of the tissue of the iris
A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening.
Colored part of the eye
Controls the amount of light entering the eye
Area behind the cornea and in front of the lens and iris. It contains aqueous humor.
fluid-filled space between the cornea and iris
clear watery substance that fill the anterior and posterior chambers
clear fluid in the front of the lens that lubricates and nourishes that part of the eye
mesh-like structure in the anterior chamber that filters the aqueous humor as it flows into the canal of Schlemm
barraquer eye speculum
(Paper Clip, Wire Speculum) Holds open the upper and lower eyelids. Commonly used for cataract extraction.
the term for the six muscles that provide movement of the eye
abnormal deviation of the eye
a disorder in which the eyes point in different directions or are not aligned correctly because the eye muscles are unable to focus together
Esotropia is a form of strabismus, or "squint", in which one or both eyes turns inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance.
the perception of two images of a single object; also known as double vision
topical anesthetic used most frequently for preoperative ocular instillation
center of retina, area of highest visual acuity, contains only cones
gland located in the upper outer region above the eyeball that secretes tears
The removal of an entire mass or part, especially a tumor or the eyeball, without rupture.
removal of the contents of the eye while leaving the sclera and cornea intact
instrument used to make the corneal cut during a corneal transplant
an example of a disease of the crystalline lens that can cause a disruption in the optical stage of image formation, leading to decreased visual acuity
extracapsular cataract extraction
surgical removal of the anterior segment of the lens capsule along with the lens allowing for the insertion of an intraocular lens implant
phacoemulsification hand piece
instrument used to remove the cataract lens in preparation for intraocular lens placement
surgical removal of all or part of the vitreous humor
jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape
-outer surface of vitreou
Instrument with which the vitreous is cut and aspirated;
technique uses a laser to treat intraocular structure
procedure which may be done in conjunction with vitrectomy if the surgeon is unable to gain visualization of the posterior cavity of the eye
the name of the opening created in the outer tunic for insertion of the infusion cannula for excision of vitreous?
What should the surgical technician be able to do in ophthalmic surgery in relation to the microscope and instrumentation ?
The procedure is performed under an operating microscope care should be taken in draping the microscope to prevent breaks in sterile technique
What scissors could be used during ophthalmic surgery?
Westcott scissors, spring-action microscissors small spring scissors and Mcpherson-Vannas iris scissors
What does cryotherapy do and use during ophthalmic surgery ?
Used in treatment of retinal detachment
Uses localized cold temperature to seal tears and holes much as diathermy unit CO2 gas passed is under pressure through flexible tubes to the tip of a probe
What type of gloves should be used in ophthalmic surgery ? What are some complications ?
Nonpowdered gloves should be used if not available the powder should be thoroughly removed from the gloves. Powder and other debris like lint can cause formation of post-operative granuloma in the eye.
What are common suture needle types used in ophthalmic surgery ?
Round bodied with cutting tip (taper cut )
Reverse cutting (micropoint)
What is the fluid that passes through the canal of Schlemm ?
a circular channel in the eye collects aqueous humor from the anterior chamber and delivers it into the bloodstream via the anterior ciliary veins.
What are some of the various pieces of equipment and supplies used in ophthalmic surgery ?
What are the six extrinsic muscles and their locations in relation to the eye ?
superior rectus, medial rectus, lateral rectus, inferior rectus, superior oblique, and inferior oblique
After a Strabismus Correction : Recession/Resection what is the special step done after the end of the procedure ?
What is the purpose of rods ?
located in the retina. Rods are more common and see black/white and motion
What are C3f8 and SF6
C3F8 Perfluoropropane SF6 Sulfur hexafluoride gas
the patient may receive an injection of intraocular gas to create pressure on the retina while subretinal fluid is reabsorbed and scars form.
Where do the lacrimal ducts drain tears into ?
When the eye blinks, the lid pushes the tears across the eye into the drains (puncta) at the inner corner. The drains empty into channels (canaliculi) that connect the eye with the nose. The channels drain into a tear sac (lacrimal sac) that lies beside the nose. The sac narrows into the tear duct (lacrimal duct), which drains through the nasal bone into the nostril.
What forms the outer tunic of the globe ?
Cornea and Sclera
What forms the posterior globe of the eye ?
What are the layers of the cornea ?
1. Epithelium Layer
2. substantia propria
3. elastic lamina
4. endothelial cells
What is the role of the Cornea ?
The cornea allows light into the eye and bends the light rays to help the lens focus them upon the retina.
What special steps are taken for donor corneas ?
The donor tissue is screened and tested for the presence of communicable diseases
The donor cornea is sized 0.1 mm larger than the recipient opening to ensure proper fit.
What are the characteristics of the lens ?
The lens is a transparent, biconvex structure that is situated behind the pupil anterior to the vitreous body. It is encircled by the ciliary processes and encapusulated in a transparent, elastic, delicate membrane.
What is an important point about cataracts ?
The word cataract is used to describe a lens that has become opaque. Cataracts are a condition affecting the eye not a disease. As the lens gradually clouds the less light is able to pass through blurring and distorting images received by the retina.
What are the characteristics of IOL's
IOL's are small prescription lenses placed inside the eye for clear lens replacement surgery. IOL's may be foldable or hard. Foldable lenses are made of silicone or acrylic and can be rolled up and placed inside a tube that is inserted through the small incision.
What anesthesia is used for a vitrectomy ?
Local; should include a retrobulbar block.
What special precautions should a patient take after intraocular gases injected into the eye ?
Progression of cataracts and elevated IOP
What is the purpose of silicone oil ?
Sometimes used instead of gas to keep the retina attached postoperatively. Silicone remains in the eye until it is removed.
Where is a veirs rod placed ?
Veirs rod is placed through the laceration and the canaliculus is approximated with nonabsorbable suture around the rod.
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