Objective:To investigate the symptom detection rate and stability of anxiety and sleep quality in police officers,as well as the time-related effect of anxiety on sleep quality.Methods:The Self-Rating Anxiety Scale(SAS)and Pittsburgh Sleep Quality Index(PSQI)were used to track the anxiety and sleep quality of 564 po-lice officers twice for a year.SAS standard score ≥50 and PSQI total score＞7 were the detection criteria for anxi-ety symptoms and sleep disorders,respectively.x2 test was used to compare the differences of detection rate and the proportion of people in different symptom conversion groups.Structural equation model was used to analyze the time-related effect of anxiety on sleep quality.Results:The detection rates of anxiety symptoms and sleep disorder-swere higher in the police officers than in other studies(Ps＜0.001).The proportion of police officers with and without anxiety symptoms and sleep disorders was higher than that of the other two groupswith changes before and after(Ps＜0.05).Baseline anxiety positively predicted baseline sleep quality index(β=0.26,P＜0.001),and anx-iety after 1 year positively predicted sleep quality index after 1 year(β=0.19,P＜0.001).Baseline anxiety posi-tively predicted the sleep quality index after 1 year(β=0.06,P＜0.01).Conclusion:It shows that the stability of anxiety and sleep quality in police officers is relatively higher,and there is a high correlation between anxiety and sleep quality.

ObjectiveTo study the effect of negative pressure suction during laser in situ keratomileusis (LASIK) on rabbit retinal structure.Methods32 New Zealand white rabbits were randomly divided into normal control, experimental control, negative suction 45 seconds and negative suction 3 minutes groups. Experimental control groups were treated only using eximer laser. In negative suction groups, rabbit eyes were suction for 45 seconds or 3 minutes by negative pressure generator. The tissues of optic nerve and retina both after negative pressure suction and of normal rabbit eyes were examined with electron and light microscope 0, 7, 14, 28 days after operation. ResultsThere was no change in the tissues of optic nerve and retina between normal control and experimental control. After the negative pressure suction for 45 s, the optic nerve and retinal cells changed lightly at different time point. After the negative pressure suction for 3 min, the optic nerve fibers and retinal cells changed sharply during postoperative instant to 14th days, which can be recovered until 28 days after operation.ConclusionUltrastructural changes of retina and optic nerve may be induced by acute intraocular pressure elevation caused by negative pressure suction during LASIK.