EN
The aim of investigations was the description of changes in the lenses of dogs with senile cataract. The study was conducted on 52 dogs (from a group of 125 cases of cataract) of mixed breed and pedigree, both sexes, aged 8-20 years, originating from the Lublin area. Senile cataract was stated on the base of clinical and ophthalmological examination, dogs with secondary local or systemic infections were excluded. Senile cataracts were most often noted in mixed breed (36 dogs - 61.5% cases) followed by Spaniels, Terriers, German Shepherds and Poodles. Among all cases the disease was more frequently noted in males (32 dogs, 61.5%) rather than bitches (20 dogs, 38.5%). In 36 dogs (69%) the disease had evolved from the nucleus of the lens, but in the remaining animals (31% cases) the cataract had a cortex origin. The course of senile cataract is bilateral, but not equal and not symmetrical. The mature form evolution has a 2 year course, independently of the eye or origin.