After you have generated your EyeGlass Numbers you will also see a confidence score. This score ranges from poor to high. This confidence score is based on the precision of the test results.
In this example, accuracy refers to the closeness of a measured value to a standard or known value. Precision itself is independent of accuracy. You can be very precise, but very inaccurate as shown in the image above. The higher the combined accuracy and precision the higher the confidence level will be. If the combined accuracy and precision are low (example 1), a confidence level of poor will be displayed. EyeGlass Numbers that have a confidence level of high or good can be used to create a pair of glasses. We do not recommend users who receive a confidence level of poor or fair use their EyeGlass Numbers to create a pair of glasses. Instead they should try to refine their tests to receive a better confidence level.