1. Collocates
The phrase is most frequently preceded by the prepositions `to the` (e.g., `visible to the naked eye`) and `with the` (e.g., `see with the naked eye`). Common preceding verbs include `see`, `observe`, `detect`, and `spot`. The most frequent preceding adjective is `invisible`.

2. Semantic Prosody
The phrase carries a semantic prosody of limitation or insufficiency. It establishes a baseline of normal human perception that is often contrasted with a more powerful, technologically-aided form of sight (via telescopes, microscopes, or specialized cameras), highlighting what is hidden or imperceptible.

3. Register & Formality
The phrase predominantly appears in formal and technical registers. It is heavily used in scientific writing, particularly astronomy and biology, as well as in forensic and technological contexts. Its use in general journalism and fiction maintains a formal tone.

4. Phraseological Patterns
The most dominant lexical bundle is `(in)visible to the naked eye`. Other strong patterns include `see with the naked eye`, `observe with the naked eye`, and `detect with the naked eye`. The word/phrase itself functions as a fixed idiomatic expression.

5. Grammatical Patterns
Grammatically, `naked eye` consistently functions as the object of a preposition, primarily `to`, `with`, `by`, or `from`. The entire prepositional phrase (`with the naked eye`) serves as an adverbial, modifying a verb of perception or an adjective like `visible`.

6. Recurring Sentence Structures
A common syntactic frame is `[Subject] + is/was + (adjective) + to the naked eye`, such as `The star is visible to the naked eye`. Another is `[Observer] + (modal verb) + see + [object] + with the naked eye`.

7. Pragmatic Function / Discourse Role
The phrase pragmatically establishes a shared, baseline reality of unassisted perception. It is often used to introduce a contrast, emphasizing that a deeper or truer reality is only accessible through special tools or methods, thereby managing the audience’s expectations.

8. Frequency & Dispersion
While not a universally high-frequency phrase, it shows very high frequency and dense dispersion within specific genres. The provided data shows it is exceptionally common in texts about astronomy, with secondary concentrations in other scientific and technical fields.

9. Thematic Context (Topics)
The most prominent thematic context is astronomy, involving the observation of stars, comets, planets, galaxies, and eclipses. Other recurring topics include microscopy (cells, organisms), forensics (evidence), technology (cameras, sensors), and general discussions of perception versus realit