TL;DR: In Vietnamese folk belief a twitching eye signals that something is coming; Phan Kế Bính records only "máy mắt, có sự", without separating left and right, and he himself held that such signs cannot all be believed. A left-and-right table over the twelve double-hours exists in Chinese texts: the Qing Yuding Yueling Jiyao cites the eye-twitch entry of the Baiguai Duanjing, where left or right is good or bad depending on the hour. It is a belief with no scientific evidence.
What does a twitching left or right eye signal in folk belief?
In Vietnamese folk belief, a twitching eye ("máy mắt") is taken as a sign that something is about to happen. Phan Kế Bính records just one line in Việt Nam phong tục: "Máy mắt, có sự" (a twitching eye means something is coming)[1], without saying whether it is good or bad, and without separating the left eye from the right.
Splitting left and right by the hour is found in Chinese texts. The Qing-dynasty Yuding Yueling Jiyao (Ngự định Nguyệt lệnh tập yếu) cites the "Reading eye twitches" (眼跳占) entry of the Baiguai Duanjing (Bách quái đoạn kinh), which gives the meaning of the left eye and the right eye for each of the twelve double-hours[2]. Both are statements of belief, not verified facts.
What did old Vietnamese books record about eye twitching?
In the section "Reading signs about human affairs", Phan Kế Bính lists a string of signs that Vietnamese people of the early 20th century believed in, with the twitching eye among signs about the body and the household[1]:
| Sign | Folk belief held it means |
|---|---|
| Eye twitching | Something is coming |
| Starting suddenly | Bad news |
| A spider dropping in front of you | Good news |
| Sneezing once when setting out or starting a task | Bad; twice or more is fine |
| Black spots suddenly appearing on toenails or fingernails | Bad |
Right after the list he writes that, looking at our ways of reading signs, "many things are very mystifying and cannot all be believed"[1]. He explains that people believed in a law of resonance in heaven and earth, by which a good sign appears before a good event and a bad sign before a bad one; then he calls this a mistake, since by the new learning things like flowers blooming, birds calling, spiders dropping and fish jumping are mere coincidence[1].
Where does the table of left and right eye twitches by hour come from?
The table below follows the "Reading eye twitches" entry that the Yuding Yueling Jiyao, volume 24, cites from the Baiguai Duanjing[2]. The Chinese column is the original wording, the English its meaning.
| Double-hour | Clock time | Left eye | Right eye |
|---|---|---|---|
| Tý | 23:00 to 01:00 | 貴: something honourable | 酒食: food and drink |
| Sửu | 01:00 to 03:00 | 憂: worry | 人思: someone thinking of you |
| Dần | 03:00 to 05:00 | 行人: a traveller | 吉: good |
| Mão | 05:00 to 07:00 | 貴人: meeting a benefactor | 平安: peace |
| Thìn | 07:00 to 09:00 | 客來: a guest comes | 害: harm |
| Tỵ | 09:00 to 11:00 | 酒食: food and drink | 凶: bad |
| Ngọ | 11:00 to 13:00 | 得意: things go as wished | 凶: bad |
| Mùi | 13:00 to 15:00 | 吉: good | 喜: a happy event |
| Thân | 15:00 to 17:00 | 財: money | 文思: matters of writing |
| Dậu | 17:00 to 19:00 | 音信: news | 客至: a guest arrives |
| Tuất | 19:00 to 21:00 | 他喜: someone else's happy event | 酒食: food and drink |
| Hợi | 21:00 to 23:00 | 貴人: meeting a benefactor | 官事: official business |
In this table the left eye is not always good and the right eye not always bad: each hour differs. The common saying "left is lucky, right is unlucky", or the reverse, does not match it.
How does the Kỳ Môn tradition read an eye twitch?
The Qimen Dunjia Yuanling Jing (Kỳ Môn Độn Giáp nguyên linh kinh) has an entry on "movements of the four parts of the body": eye twitches, hot ears, trembling lips, muscle twitches. It assigns the eye to the Chấn trigram, the ear to Khảm and the lips to Khôn, then says to look at that trigram's direction on the Kỳ Môn chart and see whether it gets auspicious wonders (kỳ), gates and stars: if so it is good, if not it is ordinary, and with a bad pattern it is not good[3]. By this book, the same eye twitch is good or bad depending on the chart of the moment, with no fixed left-right table.
Why do accounts of eye twitching differ?
The three sources give three approaches: Vietnamese folk belief as Phan Kế Bính records it says only "something is coming", the Baiguai Duanjing splits left and right over twelve double-hours, and the Kỳ Môn book reads by direction and chart. The tables circulating today may come from one of these sources or may have changed through word of mouth, so the same hour of twitching can be read differently.
Does an eye twitch really foretell anything?
There is no scientific evidence that a twitching eye foretells what is coming. It is a folk belief and the wording of old sign-reading books; Phan Kế Bính himself, who recorded "máy mắt, có sự", held that such signs cannot all be believed[1].
A suggestion from Nhật Nguyệt: read the eye-twitch tables as part of folk culture and old books, to see how people of the past tried to read signs in daily life, not as a reason to worry or to decide a real matter.
