In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries. The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture as well as possible to the perceived entoptic dots.
Read more about this topic: Blue Field Entoptic Phenomenon
Famous quotes containing the words blue and/or field:
“Tommy is three and when he’s bad
his mother dances with him.
She puts on the record,
“Red Roses for a Blue Lady”
and throws him across the room.”
—Anne Sexton (1928–1974)
“She is as in a field a silken tent
At midday when a sunny summer breeze
Has dried the dew and all its ropes relent,”
—Robert Frost (1874–1963)