Snellen Charts Manufacturers

A snellen chart is an eye chart used by eye care professionals and others to measure visual acuity. It is generally printed with eleven lines of block letters. The first line consists of one very large letter. Subsequent rows have increasing numbers of letters and decreasing in size. A patient taking the test covers one eye, and reads the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the patient's visual acuity in that eye.