Detecting disguised visual acuity
10.13618/j.issn.1001-5728.2025.04.008
- VernacularTitle:检验识别伪装视力降低实验研究
- Author:
Lan WANG
1
;
Wentao XIA
;
Suzhen WANG
;
Xingcai LI
;
Tiantong YANG
;
Zilong LIU
;
Zhixiang ZHANG
Author Information
1. 青岛大学山东省健康医疗大数据工程研究中心,山东青岛 266011
- Publication Type:Journal Article
- Keywords:
Forensic clinical medicine;
Visual acuity test;
Disguised visual acuity;
Diversified test;
Visual acuity discrepancy
- From:
Chinese Journal of Forensic Medicine
2025;40(4):428-433
- CountryChina
- Language:Chinese
-
Abstract:
Objective To differentiate disguised visual acuity,(VA)by analyzing discrepancies across diversified visual acuity tests.Methods Volunteers were recruited,and VA(V,and V2)was measured before and after the experiment.Volunteers independently selected an experimental VA(Vt)and were assigned to either the disguised group or the control group.A specially designed heterogeneous optotype chart and a single-optotype chart with variable test distances were used to measure VA(t1,t2,t3),while a standard logarithmic VA chart was used to measure VA(t4).Based on the maximum VA discrepancy(△t),t4 was classified as"real"(≤ 1 line),"disguised"(≥ 2 lines),or"suspicious"(＞1 and＜2 lines with anomaly).Results A total of 126 valid cases were collected,including 30 in the control group and 96 in the disguised group,with VA ranging from 0.2～1.5.All 88 opinions classified as"disguised"were from the disguised group,and all 29 classified as"real"were from the control group.Of the 7 cases deemed"suspicious,"6 were from the disguised group.The sensitivity,specificity,and overall diagnostic accuracy were 91.7％,96.7％(P＜0.0001),and 92.9％(P＜0.0001),respectively.In the disguised group,38 cases exhibited unexplained identifying anomalies.Conclusion A VA discrepancy of ≥ 2 lines is a reliable indicator for detecting disguised visual acuity.Identifying anomalies may serve as a novel and sensitive marker for recognizing visual disguise.
