Page 168 - Manual of Equine Field Surgery

164 OPHTHALMIC SURGERIES

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Figure 27-3 Catheter placed in the dorsal punctum

demonstrating the use of digital pressure to obstruct

the ventral canaliculus.
Figure 27-4 Nasolacrimal catheter sutured in place

to treat nasolacrimal obstruction.

stab incision and exits dorsally or dorsolaterally

along the face. The catheter is sutured in place catheterization. Catheters that exit the dorsal or

adjacent to the opening of the duct with two ventral puncta and are sutured in place have the

simple-interrupted No. 3-0 monofilament non- potential to rub the cornea and cause corneal

absorbable sutures. Additional sutures are placed ulceration. Care should be taken to avoid contact

along the face to secure the catheter" (Figure of the catheter or sutures-with the cornea.

27-4).

REFERENCES

POSTOPERATIVE CARE

1. Moore C: Eyelid and nasolacrimal disease, Vet Clin

N Am Equine Pract 8:499, 1992.

2. Strubbe D, Gelatt KN: Ophthalmic examination and

i
Medicatons: If obstruction of the nasolacrimal diagnostic procedures. In Gelatt KN, editor: Veteri-

duct is diagnosed, the.n flush material is submit- nary ophthalmology, ed 3, Philadelphia, 1999, Lip-

ted for bacterial culture and susceptibility, the pincott Williams & Wilkins.

results of which should direct antibiotic use. 3. Cooley PL: Normal equine ocular anatomy and eye

Antimicrobial therapy should be continued for at examination, Vet Clin N Am Equin.e Pract 8:427,

least 14 days. 1992.

Other: Nasolacrimal catheters that are sutured 4. Carastro SM: Equine ocular anatomy and oph-.

in place to maintain patency of the duct during thalmic examination, Vet Clin N Am Equine Pract

treatment should remain in place for at least 2 to 20:285, 2004.

3 weeks.1 Topical antimicrobial therapy should be 5. Samuelson D: Ophthalmic anatomy. In Gelatt KN,

continued until the catheter is removed. editor: Veterinary ophthalmology, ed 3, Philadelphia,

1999, Lippincott Williams & Wilkins.

6. Slatter D: Lacrimal system. In Slatter D, editor:

Fundamentals of veterinary ophthalmology, ed 3,
COMPLICATIONS Philadelphia, 2001, WB Saunders.

7. Brook D: Use of an indwelling nasolacrimal cannula

Congenital ostium malformation or scarring of for the administration of medication to the eye,

the nasolacrimal duct or puncta may prevent Equine Vet J (Suppl) 2:135, 1983. ·