Domestic ferrets are just one breed, the colors are the type of ferrets. Within the genus Mustela, ferrets belong to the subgenus Putorius, from which there are only three extant species: M. putorius, the European polecat; M. eversmanni, the Siberian, or steppe polecat; and M. nigripes, the black-footed ferret.
Nearsightedness, also known as myopia, is a common type of refractive error where close objects appear clearly, but distant objects appear blurry. The cornea and lens bend (refract) incoming light rays so they focus in front of the retina.earsightedness, also known as myopia, is a common type of refractive error where close objects appear clearly, but distant objects appear blurry. The cornea and lens bend (refract) incoming light rays so they focus in front of the retina.
While farsightedness makes it difficult to see objects that are close-up, nearsightedness makes it difficult to see objects from a distance. Farsightedness is caused by an imperfection in the eye and is usually genetic. Nearsightedness can be caused by any number of factors and has many different degrees of severity.hile farsightedness makes it difficult to see objects that are close-up, nearsightedness makes it difficult to see objects from a distance. Farsightedness is caused by an imperfection in the eye and is usually genetic. Nearsightedness can be caused by any number of factors and has many different degrees of severity.