Dogs and cats can develop cataracts, or an abnormal opacity in the lens inside the eye, due to factors such as diabetes, genetics or aging. If tests show that the retina, or nerve layer in the back of the eye, is healthy, surgery can be performed. Once the cataract is removed, an artificial lens can often be implanted.
The age of onset for inherited canine cataracts is variable, usually from 5-8 years of age. The refractive power needed is determined by the axial length of the globe, the curvature of the cornea, and the location of the replacement lens within the eye.
With that, many dogs and cats can recover about 90 percent of their vision.