靉靆

Etymology 1
Native reduplicative ideophone.

Adjective

 * 1)  thick
 * 2)  gloomy; dark; cloudy

Etymology 2
of a word from an unidentified foreign language (pronounced ai-dai, ai-na, etc.), since the 15th century. Frequently cited etymons are, and , both derived from 🇨🇬.

Semantically, the sense “eyeglasses” was associated with Etymology 1, the interpretation being that eyeglasses are what  cover  the eyes to allow one to see more clearly, akin to the way clouds  cover  the sky, according to Liuqing rizha (《留青日札》, 1573 ) by Ming-dynasty scholar Tian Yiheng.

Noun

 * 1)  eyeglasses; spectacles

Etymology
From.

The “eyeglasses” sense is a borrowing of.

Adjective

 * 1)  cloudy, dark
 * 2)  dark, gloomy

Noun

 * 1) eyeglasses, spectacles