2. Select for first tests the children who obviously need attention and will be obviously benefited. Use the eye test to help trace the cause of headaches, nervousness, inattention. 3. Let the children mark off the distances with a foot rule and chalk, going as high as twenty. Be sure to get the best light in the room. 4. Start all children on the ten-foot line. If a child cannot read at ten feet the letter which should be seen at that distance, move the child forward, have it step forward and backward, and note the result carefully. 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. If the Snellen card is used, and if it is more convenient to have both child and card stationary, satisfactory results will be obtained by having the child read from large letters down as far as he can see. 5. Have the child read from right to left, from left to right, or skip about so that memory cannot aid the eye. 6. Test each eye separately. I was twenty-five years old before I learned that my left eye did practically all of the close sight work. A grown woman discovered just a few days ago that she was almost blind in the left eye; when she rubbed the right one while reading she was shocked to find that she could see nothing with the left eye. 7. If the card is stationary and the child moved, and if only one size of the letter is used, put in the denominator the number of feet at which the normal eye should see clearly, and in the numerator the distance at which each eye and both together can easily see. If the regular Snellen card is used containing letters of different size, place in the denominator the number of the lowest line each eye and both eyes together can read easily, and in the numerator the number of feet from card to eye.