Here's why:
* It's rare: Deer born without eyes, or who lose their sight later in life, are uncommon.
* Lack of specific terminology: There are no widespread, accepted terms for animals with specific disabilities.
* Focus on function: Instead of a specific name, we would likely describe the deer based on its condition, like "a blind deer" or "a deer with no eyes."
It's important to remember that even without sight, a deer can still live a relatively normal life, adapting to its environment using its other senses.