Wiktionary
n. a sign or poster showing letters or symbols in progressively smaller lines of type, used to test distance vision
WordNet
n. a chart that is read from a fixed distance; used as a test of vision
Wikipedia
__NOTOC__ An eye chart is a chart used to measure visual acuity. Eye charts are often used by health care professionals, such as physicians or nurses, to screen persons for vision impairment. Ophthalmologists, physicians who specialize in the eye, also use eye charts to monitor the visual acuity of their patients in response to various therapies such as medications or surgery.
The chart is placed at a standardized distance away from the person whose vision is being tested. The person then attempts to identify the symbols on the chart, starting with the larger symbols and continuing with progressively smaller symbols until the person cannot identify the symbols. The smallest symbols that can be reliably identified is considered the person's visual acuity.
The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test, Golovin–Sivtsev table, the Rosenbaum chart, and the Jaeger chart.
Usage examples of "eye chart".
Though speaking of that-you said you'd never seen a literate eye chart before.
I'd met this guy a few times when I was an NYPD detective, and he seemed like an okay guy, except for his name, which looked like the third line of an eye chart.
On one wall hung an eye chart and an exquisite depiction of the Ascension in which the artist's skill with light was so great that the scene became three-dimensional and the figures therein seemed almost alive.
Beside a Breuer bentwood chair on which to hang clothes were a doctor's scale and an optometrist's eye chart.
In the meantime, he made sure the work crews used the latrines that had been dug an environmentally correct distance from the stream, under the supervision of Shop Foreman Bloody Bob, who was just as proud of his new title as he was of his newest and most prized possession, the bronze-mounted magic visor that not only improved his vision beyond all expectations, so that he could now identify every animal drawn on the eye chart, but gave him a most fearsome and dramatic aspect, as well.
Armstrong filled out about a million forms and carried them with him to the eye chart, which came next.
Then she put it into her purse and looked up at the wall, at an eye chart that must've been thirty or forty years old.