[Experimental study about the effects of exploratory endoscopical technique on the posterior orbit]

To determine the effects of the orbital endoscopic technique in the dog (IOP, vascularization).

Eight dogs were used to examine the four quadrants of the posterior orbit that we have established as a theoretical division of the orbit. Thus, two examinations were performed for each region. In order to observe the effects of the current technique, a rigorous control on the visual parameters was established, paying special attention to the effects of the blood supply in the vessels of the eyeball, measuring the posterior ciliary arteries (in the dog, the central artery of the retina is very rudimentary) with the Doppler color and Power Doppler echography.

The results compiled on the examination of the visual function, ocular mobility, the general examination of reflexes, examination of the ocular fundus and general condition did not show any significant alteration. Conjunctival chemosis occurred in one case, but spontaneously disappeared 76 hours after the operation. The IOP only showed a mild increase after the surgery in two cases. The PSV and EDV blood flow values increased in the immediate post-surgery, above all in the vessel belonging to the region operated in 6 out the 8 subjects, but had decreased at 7 days post-surgery.

The results obtained did not show any significant alterations when the orbital endoscopic technique for the posterior orbit was used. A mild increase is observed in the blood velocity values of the posterior ciliary arteries after the surgery that seems to indicate a certain compression. However, these values are reduced significantly when the method is repeated within 7 days.