盲公鏡 [－－镜]

Jyutping maang4 gung1 geng3
Pinyin máng gōng jìng

Definitions (CC-CANTO)
  1. Dark glasses (referred to as 'Blind glasses' as typically used by the blind)
Definitions (Wiktionary)
  1. noun, dated, possibly
    glasses worn by the blind
  2. noun, archaic, in Mandarin, slang
    black sunglasses