Here are a few options for a WordPress post tag description, in Traditional Chinese, for the title “預防乾燥症” (Preventing Dry Eyes):

**Option 1 (Concise & General):**

> 了解如何預防乾燥症，擁有舒適健康的眼睛。

(Translation: Learn how to prevent dry eyes and have comfortable, healthy eyes.)

**Option 2 (Focus on preventative measures):**

> 掌握預防乾燥症的關鍵知識，包括生活習慣調整、環境控制與眼部護理，保護眼睛健康。

(Translation: Master the key knowledge to prevent dry eyes, including lifestyle adjustments, environmental control, and eye care, to protect eye health.)

**Option 3 (Targeting a specific audience):**

> 針對長時間使用電子產品、配戴隱形眼鏡或居住在乾燥環境的人士，提供預防乾燥症的實用建議。

(Translation: Provides practical advice for preventing dry eyes specifically for those who spend long hours using electronic devices, wear contact lenses, or live in dry environments.)

**Option 4 (Simple and accessible):**

> 關於預防乾燥症的文章和資訊，幫助你保持眼睛濕潤舒適。

(Translation: Articles and information about preventing dry eyes, helping you keep your eyes moist and comfortable.)

**Considerations for choosing the best description:**

* **Target Audience:** Who are you trying to reach with this tag? Adjust the language to match their level of understanding.
* **Content of the Posts:** What kind of articles and content are you associating with this tag? The description should reflect that.
* **Search Engine Optimization (SEO):** While tag descriptions are often not heavily weighted in SEO, including relevant keywords can still be helpful. Choose words and phrases related to “dry eyes” (乾燥症 – ganzao zheng), “prevention” (預防 – yufang), and related symptoms or causes.
* **Length:** Keep the description reasonably short and to the point, typically under 150-200 characters.

I would recommend Option 2 or 3 as they provide more actionable information and may be more helpful for your users. Choose the one that best fits the overall tone and content of your WordPress blog.