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@#AIM:To observe the clinical effects of YAG laser ablation in patients with physiological vitreous floaters by A/B ultrasound combined with autofluorescence(AF)of angiography.<p>METHODS: Screening of 30 patients(30 eyes)with physiological vitreous floaters from August 2018 to January 2019 in Hankou Aier Eye Hospital, we used A/B ultrasound to measure the distance from the wall of the ball and the back surface of the lens before operations. Check the patient's best corrected visual acuity, non-contact intraocular pressure, scanning laser fundus photography, A/B ultrasound and autofluorescence(AF)of angiography before treatment, laser ablation was performed by the same skilled doctor using ELLEX YAG laser ablation machine. After treatment, the patients were followed up at the point of 1d, 1wk, and 1mo. The same examination was performed after operation. The Image-J software was used to measure the vitreous opacity in the autofluorescence of angiography pictures before and after treatment.<p>RESULTS:There was no significant difference in the best corrected visual acuity and non-contact intraocular pressure before and after treatment(<i>P</i>>0.05). Of the 30 eyes, 28 eyes underwent laser ablation treatment once, and 2 eyes underwent laser ablation treatment twice. The average number of treatments was 1.06. After treatment, the autofluorescence of angiography showed that the vitreous opacity was obviously reduced or disappeared, and the difference was statistically significant before and after treatment(<i>P</i><0.01). No complications occurred during or after surgery.<p>CONCLUSION: A/B ultrasound combined with autofluorescence confirmed that Nd:YAG laser is safe and effective in the treatment of physiological vitreous floaters.
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@#AIM:To observe the clinical effects of YAG laser ablation in patients with physiological vitreous floaters by A/B ultrasound combined with autofluorescence(AF)of angiography.<p>METHODS: Screening of 30 patients(30 eyes)with physiological vitreous floaters from August 2018 to January 2019 in Hankou Aier Eye Hospital, we used A/B ultrasound to measure the distance from the wall of the ball and the back surface of the lens before operations. Check the patient's best corrected visual acuity, non-contact intraocular pressure, scanning laser fundus photography, A/B ultrasound and autofluorescence(AF)of angiography before treatment, laser ablation was performed by the same skilled doctor using ELLEX YAG laser ablation machine. After treatment, the patients were followed up at the point of 1d, 1wk, and 1mo. The same examination was performed after operation. The Image-J software was used to measure the vitreous opacity in the autofluorescence of angiography pictures before and after treatment.<p>RESULTS:There was no significant difference in the best corrected visual acuity and non-contact intraocular pressure before and after treatment(<i>P</i>>0.05). Of the 30 eyes, 28 eyes underwent laser ablation treatment once, and 2 eyes underwent laser ablation treatment twice. The average number of treatments was 1.06. After treatment, the autofluorescence of angiography showed that the vitreous opacity was obviously reduced or disappeared, and the difference was statistically significant before and after treatment(<i>P</i><0.01). No complications occurred during or after surgery.<p>CONCLUSION: A/B ultrasound combined with autofluorescence confirmed that Nd:YAG laser is safe and effective in the treatment of physiological vitreous floaters.
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Objective:To get in vivo confocal microscopy images which is in line with the clinical diagnostic criteria of the ocular surface by the process of using Image J.Methods: By using the image deconvolution process of open-source image analysis software Image J to obtain clear images, and reducing less clear image caused by the heart beats or involuntary movements of patients.Results: Without affecting the image resolution, the image analysis software Image J can get clearer pictures and allows doctors to have a more accurate judgments. Conclusion: Image analysis software Image J will play a more important role in ocular surface examines by in vivo confocal microscopy.
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Objective: To evaluate the reliability of the digital marker tracing method combined with center-of-mass algorithm in measuring human pelvic displacement. Methods: Six cadaveric specimens of the third lumbar vertebra to the proximal 1/3 part of femur were used in present study. The specimens had no structural abnormality and all the soft tissues were dissected, reserving the hip joint capsules and the ligaments of the pelvic ring and floor. Markers with black dots against white back-ground were used to mark the key points of the pelvis. Axial loadings from the proximal lumbar (simulating the two-legged stance) were applied by MTS in the gradient of 0 N to 500 N. Images of the front and lateral views were obtained using two CCD cameras. Using Image J software, we calculated the vertical displacement of S1, (the first sacral vertebrae) in the front view and the micro-angular rotation of sacroiliac joint in the lateral view by measuring the marker's movement. Results: There was good correlation between the marked points before and after deformation of the pelvis, with the average correlation coefficient being 0. 983. Based on the 768 X 576 pixels, pixel size (mm) 0. 681 5 X 0. 681 5 image,the accuracy of the displacement was about 0. 018 pixels and the comparative error could reach 1. 11‰. The load-displacement curves obtained in this study accorded well with the clinical results. The pelvic load-displacement curve exhibited approximately a linear behavior; the sacroiliac joint load-angular rotation curve in the sagittal plane exhibited a non-linear behavior. Under a vertical load of 500 N,the average vertical displacement of S1, of the pelvis was (0. 835 6 ± 0. 283 0) mm and the average micro-angular rotation of sacroiliac joint in lateral view was (0. 584 ±0. 221). Conclusion: Digital marker tracing method combined with the center-of-mass algorithm is a simple, accurate method for measurement of pelvic displacement, which can be widely used in biomechanical research.