Service popularization in academic library through micro-visual angle / 中华医学图书情报杂志

Academic library is an important place for teachers and students to access to resources and service, and should thus popularize its service through micro-visual angle in micro-world.The micro-world characterized by micro-communication, micro-information and micro-culture faced by academic library was analyzed, the micro-ways for academic library to popularize its service by making use of micro-platform were outlined, and it was pointed out that academic library should promote and improve its service popularization through micro-visual angle by cohering micro-power, integrating micro-data, shortening micro-distance, and extending micro-service.

Development and clinical application of a color pediatric visual acuity chart / 国际眼科杂志(Guoji Yanke Zazhi)

AlM: To introduce a new color pediatric visual acuity chart and its clinical application. METHODS:The color pediatric visual acuity chart was designed based on principle of visual angle. The optotype on the color chart had graphics. The progression rate of optotype size between 2 lines was 10 10 and 1. 2589. A regular geometric progression of optotype sizes and distribution was employed to arrange 8 lines with 11 optotype on the color chart. The testing distance was 3m. The visual acuity score could be recorded as logarithm of the minimum angle of resolution notation or decimal notation. The reliability of naked distant measurements with this new chart was tested in one eye of 100 children (4 ~ 6 years old) taking the Chinese national standard logarithm visual acuity chart standard. RESULTS: The color pediatric visual acuity chart and logarithmic chart controls, visual acuity test results that in the two groups had no significant difference (t=1. 2671, P> 0. 05 ). Two sets of vision data existed positive correlation (r= 0. 924, P CONCLUSlON:Children are easier to accept used new color pediatric visual acuity chart to inspect vision. New chart is reliability and apply to children's vision screening.

A Novel Computerized Visual Acuity Test for Children

PURPOSE: To investigate the efficacy of a computerized visual acuity test, the SNU visual acuity test for children. METHODS: Fifty-six children, ranging from 1 to 5 years of age, were included. In a dark room, children gazed at and followed a circular dot with 50% contrast moving at a fixed velocity of 10 pixels/sec on a computer monitor. Eye movement was captured using a charge coupled device camera and was expressed as coordinates on a graph. Movements of the eye and dot were superimposed on a graph and analyzed. Minimum visualized dot diameters were compared to the Teller visual acuity. RESULTS: Ten eyes (8.9%) of six children failed to perform the Teller visual acuity test, and two eyes (1.8%) of one patient failed to perform the SNU visual acuity test. The observed Teller visual acuity and SNU visual acuity were significantly correlated (p < 0.001). Visual angle degrees converted from the Teller visual acuity and SNU visual acuity were also significantly correlated (p < 0.001). CONCLUSION: The SNU visual acuity using moving targets correlated well with Teller visual acuity and was more applicable than the Teller acuity test. Therefore, the SNU visual acuity test has potential clinical applications for children.

The Exact Estimation of Visual Acuity by VEP Technology: A Report of 726 Cases of Eye Injury / 华中科技大学学报（医学）（英德文版）

This study explored the accuracy of using visual evoked potentials (VEP) technology for visual acuity estimation. The enrolled 726 patients with post-traumatic unilateral decrease in visual acuity included the injured eyes served as the experimental group, and the healthy eyes as the control group. The least signal visual angle (LSVA), and amplitude and latency of P100 were chosen as test indexes. The results under different experimental conditions were recorded by PRVEP technology. All data collected were processed and analyzed by SPSS software. The results showed that the coincidence between subjective and VEP visual acuity was 96.7% in control group, but there was very significant difference in experimental group. It was concluded that with the regression formulation for the amplitude of P100 and vision under LSVA, visual acuity can be estimated more accurately and impartially.