Confidence factor, missed scans and relation junction were confirmed as indices of the Dioptron II's validity. Consequently, a classification of the instrument's measurements was recommended. This gave three classes of finding, first, second and third, and it was subsequently verified that instrument test - retest reliability also related to class of result. Repetition of measurements which were not first-class improved instrument validity but only to a limited degree. The link between confidence factor, and astigmatism and cylinder angle discovered with the Dioptron I was corroborated with this version.