Where is the speed line? Why is it called the speed line, what does it represent?

The position of the speed line is on the adaptation circle, and its shape is a line segment radiated from the pupil to the periphery. Its formation is actually a movement trace caused by the rapid contraction of the pupil, which is affected by the amplitude and frequency of the pupil contraction, and is also affected by the operation time of the pupil. The more obvious this trace on the adaptation circle is, the more it reflects the movement characteristics of the pupil. It also reflects the speed and strength of the pupil when it contracts.

①How many speed lines are specified by the evaluation system?

The evaluation system on the distribution of radiation is mainly divided into three shapes: one is that there is no radiation on the adaptation circle; the other is the radiation on the adaptation circle, and the third is the radiation around the adaptation circle.

②How many cases are there in the arrangement of radiation?

The arrangement of the radiation is divided into a dense type and a sparse type.

③How to determine the speed line is dense or the speed line is sparse?

The adaptation circle is divided into 12 time zones. Here we take a time zone as an example: when the radiation traces in this area are obvious and the number of radiation is large, it is called dense. When the traces of radiation in this area are blurred and the number of radiation is small, it is called sparse.