The Validity of Eye Measurement and Observation of Nurses

Abstract

The authors consisted of five nurses at Tokyo Metropolitan Hospital evaluated the validity of measurement by the eye using vomited food made by authors. Fifteen materials were shown 150 times at random, and the differences of the size measured by the eyes of the observers were analyzed. The results obtained by these observations revealed that measurement by the eye was unreliable because of the presence of individual deviation. According to the differences of the extension and volume of the vomited materials, the observers' predilection was categorized in three types including a "too small", "too large" and "mixed" type. The discrepancy of the measurement tends to occur in the material with the increased extension and the irregularity in shape. Although three observers described in the chart using the term "large", "medium" and "small", a subjective impression was considered to make the validity of the term unreliable as an information value.