In eyes with longer AL, the reduction in A-V difference is explained by the parallel reduction in retinal function. These findings suggest that longer eyes have decreased retinal function and O₂ consumption, and thus are relatively less hypoxic in the presence of diabetes, which may partly explain the reduced risk of DR in these eyes.

Background: There are limited data available on the variables that might affect retinal vessel oxygen saturation (SO2) in diabetes. Therefore, the aim of this study is to assess factors associated with retinal oximetry values in persons with diabetes.

Data are presented that address the problem of discrimination between earthquakes and explosions of small magnitude (3¾≤mb≤4¾). Data sources include various long‐period seismometer installations in the United States. The data suggest that long‐period discriminants useful at mb≥4¾ remain as useful at mb≥4. The conclusion is also drawn that detection of the surface wave of mb=4 earthquakes can be accomplished at distances of 6000–7000 km.

Retinal arteriolar dilation during flicker stimulation is reduced on short-term retesting, without a significant change in baseline vessel diameter, indicating decreased responsiveness to the flicker stimulus. Researchers should allow at least 30 minutes between consecutive tests to minimize suppression of the flicker response.