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Simple heterochromia – a rare condition characterized by the absence of other ocular or systemic problems. The lighter eye is typically regarded as the affected eye as it usually shows iris hypoplasia. It may affect an iris completely or only partially. Congenital Horner's syndrome [16] – sometimes inherited, although usually acquired.
Blue eyes in dogs are often related to pigment loss in coatings. The merle gene results in a bluish iris, and merle dogs often have blue, walled, or split eyes due to random pigment loss. Some genetic variants cause Heterochromia iridum. [68] The second way blue eyes can appear is when a dog has a lot of white fur on the face.
In many dog breeds the Piebald gene is common. The white parts of the fur interrupt the pigmented coat patterns. Dogs that may have a spotted or multicolored coat, are often called piebald if their body is almost entirely white or another solid color with spotting and patches on the head and neck.
Human eyes have three types of cones: red-sensing, green-sensing and blue-sensing. Dogs, on the other hand, only have two types of cones in their eyes, allowing them to detect blue and yellow ...
From the Sakhalin Husky to the Patterdale Terrier, we bet you haven't heard of these rare dog breeds. Skip to main content. 24/7 Help. For premium support please call: 800-290 ...
Grey eyes make up about 3 percent of the world's population—the second rarest eye color. There are also rare cases of violet and red-colored eyes. What Determines Eye Color?
Blue merle Border Collie puppy Red merle Australian Shepherd. Merle is a genetic pattern in a dog's coat and alleles of the PMEL gene. It results in different colors and patterns and can affect any coats. The allele creates mottled patches of color in a solid or piebald coat, blue or odd-colored eyes, and can affect skin pigment as well. Two ...
With most eye colors, the amount of melanin is consistent across the entire iris—the more melanin, the darker the eye will appear. With hazel eyes, however, varying amounts of melanin exist in ...