The finding goes against decades of conventional wisdom in the restaurant business that suggests there is a menu "sweet spot" where diners look the longest.
Restaurants place the items they hope to sell the most in this fabled sweet spot, lying just above the midline on the right-hand page.
The sweet spot is just one strategy, along with colourful text and highlighted boxes, which menu designers use to catch a diner's wandering eye, said SF State researcher Sybil Yang, assistant professor of hospitality and tourism management.
It is an idea with surprisingly little data behind it, Yang found out. While researchers have studied how people scan a Web page or textbook, there are very few empirical studies of menu reading.
Menu reading might be quite different from reading in other contexts, Yang pointed out, "because in a restaurant you have an audience with the motivation to read the entire thing."
"The restaurant industry has been piggybacking off past research," said Yang, without having the resources to test ideas like the sweet spot.
"It's like a bad rumor that just kept perpetuating."
One widely cited study of menu "scanpaths" comes from graphic designer William Doerfler, who published an influential "focal map" of menu reading suggesting that a reader's eyes zigzag across menu pages and focus for the longest time on the right-hand sweet spot.
"I could only go from my own experience," Yang said, recalling the Doerfler study, "so I was thinking, 'am I just weird?' because I don't read it that way."
To learn more, Yang recruited test subjects to wear an infrared retinal eye scanner, read through a mock menu, and then choose a full meal as if they were at a real restaurant.
She used video to record and analyse the readers' eye movements, or scanpaths as they perused the menu.
She found that on average, people read the menu sequentially like a book, moving from left to right and down the pages of the two-page menu.
They read slowly, suggesting that they were reading for information rather than just scanning the pages.
Yang found no evidence of a sweet spot where eyes tended to focus for the longest time, but she did notice a "sour spot" where readers focused for the least amount of time.
The sour spot contained information about the restaurant and a list of salads - which may not have been of interest to the mock diners, Yang suggested.
"The good news [for restaurants] is that people are reading the menus carefully, and that they seem to be choosing an entr?e and then building a meal around it," she added.