Page 182 - Manual of Equine Field Surgery

178 OPHTHALMIC SURGERIES

tal foramen and 2 to 3 mL of 20/o lidocaine are needle within the foramen in fractious patients.

injected.1 Surgical exploration to remove the needle is nec-

The palpebral nerve is located by palpation essary if this latter complication occurs.

along the dorsal aspect of the zygomatic arch with

the index finger. A 25-gauge needle is inserted

through the skin adjacent to the nerve as it crosses REFERENCES

the zygomatic arch, and I to 5 mL of 2% lidocaine

are injected subcutaneously. The injection site 1. Strubbe DT, Gelatt Kl-l: Ophthalmic examination

should be gently massaged for 2 to 3 minutes. and diagnostic procedures. In Gelatt KN, editor: Vet-

Resulting eyelid akinesia may last 45 minutes to 1 erinary ophthalmology, ed 3, Philadelphia, 1999, Lip-

hour.' pincott, Williams & Wilkins.

2. Cooley PL: Normal equine ocular anatomy and eye

examination, Vet Clin N A·m Equine Pract 8:427,

COMPLICATIONS 1992.
3. Carastro SM: Equine ocular anatomy and oph-

thalmic examination, Vet Clin N Am Equine Pract

Inserting the needle directly into the supraorbital 20:285, 2004.

foramen for frontal nerve block is preferred 4. Samuelson D: Ophthalmic anatomy. In Gelatt KN,

by some clinicians but has the potential hazards editor: Veterinary ophthalmology, ed 3, Philadelphia,

of intravascular injection and breaking off the 1999, Lippincott, Williams & Wilkins.