Spring is the time of year when the department gets the most calls regarding supposedly abandoned or orphaned animals. As biologists have learned, usually these animals arenât orphaned at all. Often, overeager individuals ârescueâ the animal while the mother is foraging. The walrus pup before transport to Sea World.
Nuclear Sclerotic Cataracts. This is the most common type of age-related cataract, caused primarily by the hardening and yellowing of the lens over time. Nuclear refers to the gradual clouding of the central portion of the lens, called the nucleus; sclerotic refers to the hardening, or sclerosis, of the lens nucleus.
Types of cataracts include: 1  A subcapsular cataract occurs at the back of the lens. 2  A nuclear cataract forms deep in the central zone (nucleus) of the lens. 3  A cortical cataract is characterized by white, wedge-like opacities that start in the periphery of the lens and work their way to the center in a spoke-like fashion.