Snellen

This chart which is called a Snellen Eye Chart, measures visual acuity.

BellaOnline - The Voice of Women 2008

In the United States, visual acuity (how clear and sharp our vision is) is generally measured using a Snellen Chart.

Eyeglasses 101 2008

These numbers indicate how well a person can see a particular line on the Snellen Chart at a specified distance.

Eyeglasses 101 2008

Paraponyx diminutalis Snellen (Pyralidae: Lepidoptera) as a serious pest of Nymphoides cristatum in Keoladeo National Park, Baharatpur, Rajasthan.

Keoladeo (Bharatpur) National Park, India 2009

Most of us are familiar with the big "E" Snellen Chart on the ophthalmologist's wall.

Tom McIntyre's Glossary of Shooting Optics Terms 2007

After being assistant to the ophthalmologist H. Snellen Sr. in the renowned eye-hospital Gasthuis voor

Willem Einthoven - Biography 1965

Every school, private and parochial as well as public, should supply itself with the Snellen card for testing eyes.

Civics and Health William H. Allen

Moreover, as shown below, it is needed by children able to pass satisfactorily the Snellen test.

Civics and Health William H. Allen

It is better to have ten separate letters of exactly the right size and the same size than a row of letters on one card, as in the Snellen test, otherwise memory will aid the eye, or, as happened recently, a whole class may agree to feign remarkable nearsightedness or farsightedness by confusing letters learned in advance from the card.

Civics and Health William H. Allen

Practically, however, it is out of the question at the present time to have the majority of children given a more thorough test than that provided by the Snellen card.

Civics and Health William H. Allen