The phrase "eye defects" refers to problems or issues with a person's eyes that can affect their vision, such as being nearsighted, farsighted, or having astigmatism.
Unfortunately, the same gene that is responsible for the desirable coat and eye appearance is often responsible for many developmental eye defects. (eyecareforanimals.com)
Because of the nature of hereditary eye defects, this exam should be repeated every two years or prior to any subsequent breeding. (oldenglishsheepdogclubofamerica.org)