Surgical anatomy of the lens was studied in dog, cat, pig, sheep, goat, cow, buffaloe, camel, horse, mule and donkey. 20 lens from each species were extracted from eyeballs of a newly sacrificed animals. Each lens was examined fully, including weight, volume, diameter, axis and thickness of the lens capsule at different levels. The aforementio ned knowledge is of an importance for the success of the operations usually performed for treatment of one of the most common disease of the lens in different domestic ani mals "cataract". Also an anatomical study of the lens is an aid in forensic medicine.