How is the cow iris different then a human iris?

The cow iris differs from the human iris primarily in its structure and function. In cows, the iris is typically more rounded and larger in proportion to the eye, allowing for better night vision, which is beneficial for their grazing lifestyle. Additionally, cow irises often have a more pronounced variation in color, ranging from brown to blue, while humans generally have a wider range of colors but less variability in size and shape. Moreover, the cow iris has a greater ability to regulate light entry, adapting to their environments.