We have realized this work in cooperation with the Laboratory of Ophtalmology, Institute for Biomedical Research, Kaunas Medical University and Department of Anatomy and Physiology, Lithuanian Veterinary Academy. Using A-mode ultrasonography, we investigated structural parameters of the rabbit eye. The intraocular dimensions measured were as follows: distance between the anterior cornea to the anterior lens (CA), Thickness of the lens, distance between the surface of the retina (V), distance from the anterior cornea to the retina, which represents the total axial thickness. We have designed the original investigation methods and ultrasonic equipment with ultrasonic tranducer (f=12 Mhz). Using the acoustodiagnostic system, we were carrying out precise biometry of eye tissues. Ultrasonic investigations were done on 10 eyes of rabbit’s age 12 month. Comparative investigation between rabbits and pigs eye structural elements was done. The percentage relation between total axial length and other ocular dimensions rabbits and pigs eyes was estimated.