Which structures in the eye do not have their own blood supply and therefore rely on diffusion of oxygen and nutrients from adjacent tissue or fluid? What advantage does this avascularity confer?

Explanation

### Step-by-Step Solution:

1. **Identify the Structures in the Eye**:
- The question asks for structures in the eye that do not have their own blood supply.
- The primary structures that fit this description are the **cornea** and **lens** of the eye.

2. **Understanding Avascularity**:
- Avascularity means that these structures do not have blood vessels.
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