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Lecture 5
Optho surgery
33
Veterinary Medicine
Professional
08/22/2016

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Term
When do we not use lubricating ointment in the eye for surgery?
Definition
-optho surgery
Term
Which optho surgery do we use lubricating ointment for?
Definition
-pre-tarsorrhaphy
Term
What kind of scrub do we use for optho surgery?
Definition
-Betadine 1:10 soln
Term
Why do we not use Chlorhexidine scrub for optho surgery?
Definition
-it is toxic to the cornea
Term
Which type of forceps do we use for conjunctiva and eyelids? Which kind do we use for nictitans?
Definition
-Bishop-Harmon
-Von-Graefe
Term
What is the purpose of a Chalazion clamp?
Definition
-clamps the eyelids
Term
What do we use strabismus scissors for?
Definition
-eyelids and conjunctiva
Term
What do we use WEstcott scissors for?
Definition
-conjunctiva
Term
What do we use a strabismus hook for?
Definition
-eyelid retractor, rolling out the eyelid margins with a proptosed glove
Term
Why does a strabsimus hook have a blunted end?
Definition
-trauma to the cornea
Term
What do we use a Chalazion clamp for?
Definition
-chronically impacted Meibomian gland
Term
In general, how do we care for delicate opthalmic surgical instruments?
Definition
-rinse immediately after use with distilled water
-clean delicate instruments alone in an ultrasonic cleaner never stacking the instruments on each other
-rinse with distilled water and soak in instrument milk -> allow to air dry =? pack carefully with instruments separated
-ALWAYS USE TIP COVERS
Term
Which size of suture do we use for conjunctiva and skin in dogs and cats? What about in horses?
Definition
-6-0 to 5-0 in dogs and cats
-5-0 horse conjunctiva and 4-0 skin in horses
Term
What is special about the needles we use for eye surgery?
Definition
-cutting needles
Term
For what do we use spatula needles?
Definition
-corneal sutures
Term
Definition: Enucleation
Definition
-removal fo the globe and adnexa
Term
What is the adnexa?
Definition
-eyelids and nictitans
Term
What are the indications of an enucleation?
Definition
-permanently blind and painful eye
-permanently blind eye due to trauma in a cat
-invasive neoplasia of the globe or eyelids
Term
Describe a transpalpebral enucleation.
Definition
-going through the eyelids to reach the globe
Term
When do we specifically us a transpalpebral enucleation?
Definition
-infected corneas or globes to keep infection contained
-useful for lobe with extensive neoplasia
Term
Describe a transconjuncival enucleation.
Definition
-going through the conjunctiva to remove the globe and removing the eyelids and nictitans after globe removal
Term
When do we specifically use a transconjuntival enucleation?
Definition
-proptosed globes
Term
True or False: Some complications, but not all, of enucleations are preventable.
Definition
-FALSE, ALL complications are preventable
Term
How do we prevent infection of the ocular surgical site.
Definition
-proper surgical clipping and sterile prep
-perioperative antibiotics if skin or globe infection is a concern
-if an infected globe ruptures during removal, perform immediate culture of the orbit and copious irrigation of the orbit, start parenteral antibiotic, aways perform primary closure, do not leave open or insert a drain
-cyst or serous fluid accumulation in the orbit from incomplete removal of the nictitans gland
-non-healing hole at the medial canthus from incomplete skin removal
-extrusion of an infraorbital prosthesis
Term
How do we prevent and extrusion of an intraorbital prosthesis?
Definition
-use a secure, periorbital layer closure over the prosthesis
-shave 1/3 of prosthesis with flat surface facing out
Term
HOw can we blind the healthy eye during an enucleation? Is it permanent? In which species is it particularly common?
Definition
-excessive traction on the globe/optic nerve during enucleation
-permanent
-often occurs in cats
Term
How do we avoid causing blindness in the remaining eye during an enucleation?
Definition
-clamp pedicle => remove clamp => slide scissors in where clamp was => cut pedicle
-cut pedicle without using clamps
-partially deflate the globe first
Term
What is temporary tarsorrhapthy?
Definition
-suturing the eyelids closed without removal of the eyelid margins
Term
What is the purpose of temporary tarsorrhaphy?
Definition
-provides temporary protection to the globe
Term
What are the indications for temporary tarsorrhaphy?
Definition
-following globe proptosis (SA)
-facial nerve paralysis (LA especially camelids)
-corneal ulcers (cattle
Term
What do we use to guide us for temporary tarsorrhaphy sutures?
Definition
-meibomian gland openings
Term
What are the indications of tumor excision or eyelid laceration?
Definition
-eyelid mass excision when direct closure is possible
-excision of a cicatricial eyelid scar creating hair irritation to the cornea
-repair of an eyelid laceration
Term
What are some of the possible complications of eyelid laceration or tumor excision surgery?
Definition
-suture irritation to the cornea: make tight figure 8
=Step-defect at the eyelid margin
-gapping at the eyelid margin
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