Mkh. Yap et B. Brown, THE REPEATABILITY OF THE NONINVASIVE BLUE FIELD ENTOPTIC PHENOMENON METHOD FOR MEASURING MACULAR CAPILLARY BLOOD-FLOW, Optometry and vision science, 71(5), 1994, pp. 346-349
The speed of macular capillary blood flow can be estimated by using th
e blue field entoptic phenomenon. The technique uses a matching task i
n which the subject matches what is seen entoptically with a computer
simulation of the phenomenon. In this study, we tested the repeatabili
ty of the leukocyte speed results obtained using this technique. Fourt
een young subjects were tested on five different occasions. Group mean
leukocyte speed did not vary significantly from one recording session
to the next. However, readings for individuals varied substantially f
rom one recording session to the next. This variability limits the use
fulness of this technique for screening or monitoring macular blood fl
ow in individuals.