The statistically significant correlation between the total item score and binocular VA was 0.24. Analyses showed that DVS satisfies the criteria for classification as a valid unidimensional and cumulative scale, as CS (0.93), CR (0.99), and MMR (0.85) values fall within the desired range. ![]() Regularity in the banding pattern of the scalogram of the 108 participants was suggestive of a deterministic Guttman scale. ![]() The relationship between total item score and binocular visual acuity was determined.įive participants were excluded because of missing data. Standard criteria of scalability were evaluated that included the coefficient of reproducibility (CR), minimal marginal reproducibility (MMR), and coefficient of scalability (CS). Responses of 113 participants to the DVS were subjected to Guttman analysis. The aims were to determine whether the DVS fulfills Guttman scaling criteria and to test the relationship between DVS score and VA in a cataract population. ![]() ![]() Like VA testing in which letter reading becomes progressively difficult through the test, DVS questions have a hierarchy of difficulty (Guttman scale). The Distance Vision Scale (DVS) is a self-assessment of visual acuity (VA).
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