All ocular abnormalities were
documented and, for selected dogs, fundus photographs were taken with either a
portable camera (RC - 2, Kowa Company, Tokyo, Japan) or through a 20 - diopter lens (Volk Optical, Mentor, OH, USA) with a digital video
camera mounted on an indirect ophthalmoscope (Omega 2C, Heine Optotechnik, Herrsching, Germany).