四眼龜 [－－龟]

Jyutping sei3 ngaan5 gwai1
Pinyin sì yǎn guī

Definitions (CC-CANTO)
  1. four eyed turtle; can be use to tease someone who wear glasses [written and colloquial]
Definitions (粵典–words.hk)
  1. 名詞、俚語
    對​戴眼​鏡​嘅​人​嘅​鄙​稱​（​量​詞​：​隻​）
    an impolite term for someone wearing glasses, "four-eyes"; literally: four-eyed turtle
Definitions (Wiktionary)
  1. noun, Cantonese, derogatory, figuratively
    bespectacled person; someone who wears glasses; four-eyes
    (syn.) 四眼狗 pejorative, 四眼佬, 四眼田雞, 四眼妹 girl, 四眼兒狗, 四眼兒, 四眼婆 woman, 四眼龜 pejorative, 四眼佬 man, 架樑, 四眼兒狗 pejorative, 四隻眼 pejorative, 四眼仔 boy