The normal ultrasonographic anatomy and biometry of 60 adult sheep and 60 adult cattle eyes were evaluated by saline immersion technique. Five intraocular dimensions were taken: corneal thickness, aqueous chamber depth, lens diameter, vitreous chamber depth and axis bulbi. The eyes were then frozen and cut in a sagittal plane and the same dimensions were measured directly. Aand B-mode measurements were compared with each other and with that of direct measurements. There was no difference between Aand B-mode measurements. However, there was a difference between ultrasound and direct measurements.

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Abstmct-Eight cases of intraocular malignant melanoma in domestic cats are presented and compared to these tumors in the dog and the human. The significance of the origin of all 8 cases within the anterior uvea and its relationship to vascular factors is discussed.

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