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1914 Proc. 34th Ann. Convent. Internat. Custom Cutters' Assoc. Amer. 164 I use more or less the Eyeball system; it does not matter where they [sc. pattern pieces] are placed. The sleeve is drafted upon half breast line.

1954 Morning Herald (Maryland) 28 Aug. 20/3 Murphy said that the old fashioned ‘eyeball’ method of determining a credit risk was..ineffective.

1958 Abilene (Texas) Reporter-News 3 Sept. 1/2 [They] had relied on their ‘eyeball estimate’ that there were going to be more [children] than ever—and a spare bus was thrown immediately into the..area.

1963 Describing & Measuring Managerial Ability & Services: Conf. Proc. 1962 28 He may..adopt a nonmathematical or eyeball approximation. This technique is abhorrent to the scientifically inclined.

1965 Washington Post 5 Jan. b4/2 The bottom is visible at most times and piloting is done almost entirely by eye, the depth being judged by the color of the water. ‘Eyeball navigation’, they call it.

1972 Motor Boating & Sailing May 129/1 I was wishing I had my wet suit for that inevitable dip into the glacier-fed waters, but I didn't, so I looked for an alternative to an eyeball inspection of the problem.

1992 Times 2 Jan. (Boating Suppl.) 15/2 Sailing among the Ionian isles is mostly eyeball navigation.

2005 D. Wells NOLS Wilderness Navigation vi. 121 After you have written down your eyeball estimates, double-check them using a grid reader or map ruler.