The normal Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows …

Herman Snellen, MD, (d. 1908) was an ophthalmology professor at Utrecht University in the Netherlands. He was also the director of the Netherlands Hospital for Eye Patients.

Home use of this Snellen eye chart will help you determine the clarity of your distance vision. This can be useful to screen children for nearsightedness, which causes blurry distance vision.

2023年12月29日 · Snellen and other well-known eye charts are used to measure visual acuity, which refers to how well you can see without glasses or contacts. The results are used to …

2025年4月7日 · What is Snellen Test? The Snellen Test is a widely used eye test that measures visual acuity, which is the sharpness or clarity of vision. This test is often conducted by …

Visual acuity is your ability to see clearly and correctly. The Snellen eye test chart is the most common way providers test your vision during an eye exam.

2024年2月14日 · Facts and history about the eye testing chart. The most commonly used eye chart is known as the Snellen chart. It usually shows 11 rows of capital letters.

2025年3月22日 · A Snellen test uses a chart with different sizes of letters or forms to evaluate your visual acuity — that is, the sharpness of your vision. The test shows how accurately you …

What is visual acuity and what does 20/20 vision mean? Visual acuity (VA) is commonly referred to as the sharpness of vision, measured by the ability to discern letters or numbers at a given …

Snellen chart, chart used to measure visual acuity by determining the level of visual detail that a person can discriminate. It was developed by the Dutch ophthalmologist Herman Snellen in …