lens nucleus
Definition
Noun: - The central, dense core of the eye's crystalline lens: The "lens nucleus" is the innermost, hardened part of the lens, surrounded by the softer lens cortex. It is a key structure in the anatomy of the eye, contributing to its focusing power.
Usage
The term "lens nucleus" is a specific anatomical term used primarily in medical, biological, and optical contexts to describe the central region of the eye's lens. - In cataract surgery, the hardened lens nucleus is often emulsified and removed. - With age, the lens nucleus becomes less flexible, affecting the eye's ability to focus on near objects (presbyopia).
Advanced Usage
- "Nuclear cataract": A type of cataract that forms specifically in the lens nucleus, often causing a yellow or brown discoloration and central vision blurring.
- Nuclear cataracts are age-related and develop in the lens nucleus.
Variants and Related Words
- Lens cortex (noun): The softer, outer layer of the lens that surrounds the nucleus.
- Crystalline lens (noun): The transparent, biconvex structure in the eye that focuses light onto the retina. The lens nucleus is a part of this structure.
Synonyms
- Lens core: A less common but descriptive synonym for the central part of the lens.
Related Phrases
- Nuclear sclerosis: The age-related hardening and yellowing of the lens nucleus, which is a precursor to some types of cataracts.
- Nuclear sclerosis is a normal part of aging but can impact vision if it progresses.
Noun
-
the central structure of the lens that is surrounded by the cortex
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