Dogs with poor vision do not let their owners know that they have a vision problem until it is severe in both eyes. (animaleyecare.net)
Specifically, it examines the role of a good marriage as a potential buffer in the adverse consequences of poor vision in late life. (academic.oup.com)
The affected dogs start to show clinical signs of the disease and poor vision in dim light between 4 and 6 years of age. (optigen.com)