A very interesting question. To find the answer we looked into the Compton's Intereactive Encyclopedia andfound this about cat's eyes.

In bright light a cat's pupils contract to narrow vertical slits. But in the dark these slits enlarge to round openings that admit a maximum amount of light. The eyes seem to shine in the dark. This shininess results when even the smallest amount of light strikes a reflective area of iridescent green or yellow crystalline needles in the inner lining of the eye. The eyes of the Siamese cat appear red in the dark; the retinas lack pigment, and the color is provided by blood vessels. A cat is very alert to any movement, but it probably cannot distinguish color. For these reasons, it will pounce when a victim moves but may not attack prey that remains still.

Answer #% % filename A254.DOC page% % page 1 of% % numpages 1 % % date \@ "MMMM d, yyyy"May 31, 1998