LEA NUMBERS®
Pocket-Sized Near Vision Card
#271000

When you want to measure visual acuity values quickly and less exactly than with the standard near vision card (#270900) with its cord to hold the test at the correct distance, you can use the small pocket card and hold it at approximately 40 cm (16 inches). The name pocket card refers to the original use of this test during rounds at the hospitals.

Figure 1. LEA NUMBERS® Near Vision Pocket Card

1. Decide together with the child/person what are the four numbers on the uppermost row. If the child does not want to or cannot talk - choose pointing at the large numbers on the keycard as a matching game.

2. To measure the binocular vision, show the card at the distance of 40 cm (16 inches) and ask the child to identify the first number on the largest row, then the first number on the second, third and fourth row, and so on until the child makes an error. The easiest way to make sure that the child knows which row to look at is to cover the line above the line you want the child to read with the blank side of your business card. When moving to a new line, support the child by asking: “What is the first number?” The child may answer "nine". Then you ask: “What is the number next to nine?” Do not point to the optotypes. You may briefly point to the next optotype, but do not leave the pointing finger at the optotype because pointing makes it easier to fixate on the optotype.
   
   
3. In the rare case that the child is myopic and thus accustomed to looking at a close distance, test at a distance of 20 cm (8 inches). The visual acuity value is one half of the value printed at the line that the child can read correctly the majority of optotypes.
   
   
4. When the child makes an error, move up one line and ask the child to read the whole line.
   
   
5. Visual acuity is the value of the smallest line on which the child correctly reads at least three out of the five numbers.
   
   
6. The monocular values are measured the same way. First occlude the non-dominant eye and then the dominant eye. Ensure that the child/person does not peek during monocular measurements.