US 11,890,096 B2
Method for measuring flicker fusion threshold based on digital set identification
Ruishan Sun, Tianjin (CN); Jing Chen, Tianjin (CN); Luping Gao, Tianjin (CN); Jingqiang Li, Tianjin (CN); Chen Zeng, Tianjin (CN); Xingchen Yan, Tianjin (CN); Xiong Chen, Tianjin (CN); and Di Wu, Tianjin (CN)
Assigned to Civil Aviation University of China, Tianjin (CN)
Filed by Civil Aviation University of China, Tianjin (CN)
Filed on Jan. 22, 2020, as Appl. No. 16/748,821.
Claims priority of application No. 201910087082.0 (CN), filed on Jan. 29, 2019.
Prior Publication US 2020/0237281 A1, Jul. 30, 2020
Int. Cl. A61B 5/16 (2006.01); A61B 3/02 (2006.01)
CPC A61B 5/161 (2013.01) [A61B 3/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for measuring flicker fusion threshold based on digital set identification, comprising the following steps:
1) setting a measurement scheme, including setting N 8-shaped digital frames in a background light area that flickers within a set frequency, where the N takes on a value of 2 to 4, and assigning a name to each stroke of the 8-shaped digital frame, specifically in the 8-shaped digital frame:
three horizontal strokes are sequentially called a first horizontal stroke, a second horizontal stroke, and a third horizontal stroke from top to bottom; a first vertical stroke is between the first horizontal stroke and the second horizontal stroke on the left; a second vertical stroke is between the second horizontal stroke and the third horizontal stroke on the left; a third vertical stroke is between the first horizontal stroke and the second horizontal stroke on the right; and a fourth vertical stroke is between the second horizontal stroke and the third horizontal stroke;
2) setting ten groups of different frequency combinations that are applied to the N 8-shaped digital frames, respectively, wherein a frequency range of each group of the frequency combinations is from 20 to 50 Hz;
3) assigning each frequency in each group of the frequency combinations with a stroke of the 8-shaped digital frame;
4) randomly selecting, for each of the N 8-shaped digital frames, one group from the ten groups of the frequency combinations, and selecting a total of N groups, and in the N groups, a number B1 of different frequencies in the frequency group obtained by the first 8-shaped digital frame is one more than the number B of different frequencies in the frequency group obtained by the other 8-shaped digital frames;
5) determining the value of each frequency in each group of frequency combinations in the N groups of frequency combinations described in step 4), so that 0 to N random digits flickering between 0 and 9 are presented to a subject;
6) recognizing, by the subject, the flickering digits on the N 8-shaped digital frames in the background light area within a set frequency range; and
7) determining the range of the flicker fusion threshold or a final flicker fusion threshold of the subject according to the 0 to N flickering digits that can be seen by the subject.