AIM:To propose a surgical technique that successfully reopened the empty and intact capsular bag after long periods of closure,with repositioning of the intraocular lens(IOL)from the ciliary sulcus into its preferred ...AIM:To propose a surgical technique that successfully reopened the empty and intact capsular bag after long periods of closure,with repositioning of the intraocular lens(IOL)from the ciliary sulcus into its preferred habitat inside the capsular bag.METHODS:This is a case series,prospective,and interventional study.The technique was first performed on an aphakic high myope with a closed posterior capsule for 18 y.Afterwards,five patients with recurrently displaced sulcus IOLs for a range of 1 mo to 7 y were performed for the same technique.During surgery,identifying a"telltale white line"was an important landmark for detecting the site of major adhesions between the edge of the capsulorhexis and the posterior capsule.These adhesions were freed using combined manual and viscoelastic dissection,followed by an easier freeing of adhesions along the whole capsular bag.The IOL was safely implanted,exchanged,or introduced from the sulcus into the fibrotic and closed capsular bag.Patients were followed up for a period ranging from 6 to 17 mo postoperatively.RESULTS:All the patients experienced a remarkable improvement in their subjective refraction.Slit lamp examination showed a postoperative centralized IOL in the bag.The follow up visits confirmed visual and IOL stability.CONCLUSION:This newly-introduced surgical technique facilitates the reopening of the empty yet intact capsular bag that has been closed by fibrotic proliferations,with secured implantation of the IOL inside the capsular bag.Patients with inadvertent implantation of IOLs into the ciliary sulcus,yet having an intact capsular bag,can benefit from this technique.展开更多
One of the important issues in the system identification and the spectrum analysis is the frequency resolution, i.e., the capability of distinguishing between two or more closely spaced frequency components. In the mo...One of the important issues in the system identification and the spectrum analysis is the frequency resolution, i.e., the capability of distinguishing between two or more closely spaced frequency components. In the modal identification by the empirical mode decomposition （EMD） method, because of the separating capability of the method, it is still a challenge to consistently and reliably identify the parameters of structures of which modes are not well separated. A new method is introduced to generate the intrin- sic mode functions （IMFs） through the filtering algorithm based on the wavelet packet decomposition （GIFWPD）. In this paper, it is demonstrated that the CIFWPD method alone has a good capability of separating close modes, even under the severe condition beyond the critical frequency ratio limit which makes it impossible to separate two closely spaced harmonics by the EMD method. However, the GIFWPD-only based method is impelled to use a very fine sampling frequency with consequent prohibitive computational costs. Therefore, in order to decrease the computational load by reducing the amount of samples and improve the effectiveness of separation by increasing the frequency ratio, the present paper uses a combination of the complex envelope displacement analysis （CEDA） and the GIFWPD method. For the validation, two examples from the previous works are taken to show the results obtained by the GIFWPD-only based method and by combining the CEDA with the GIFWPD method.展开更多
In this manuscript, the authors have studied the Disc Displacement (DD) status of patients with acute Closed Lock (CL) to determine differences between DD with Reduction (DDwR) and DD without Reduction (DDwoR). Among ...In this manuscript, the authors have studied the Disc Displacement (DD) status of patients with acute Closed Lock (CL) to determine differences between DD with Reduction (DDwR) and DD without Reduction (DDwoR). Among the acute CL patients who visited our hospital within 2 weeks of the onset of CL, we studied 10 patients whose CL was released (DDwR) and 13 patients whose CL was not released (DDwoR). The DDwoR group was significantly older than the DDwR group. Although the mouth opening distance was significantly greater in the DDwoR group than in the DDwR group, the two groups were identical in the duration of CL. Sagittal MRI images showed no significant differences between the two groups in disc length and disc thickness (anterior band, intermediate zone, and posterior band). Multisection sagittal and coronal images identified lateral DD in 7 of the 10 patients in the DDwR group, although no specific direction of the DD was observed in the DDwoR group. Furthermore, deformation of the medial disc was common in the DDwoR group but uncommon in the DDwR group.展开更多
文摘AIM:To propose a surgical technique that successfully reopened the empty and intact capsular bag after long periods of closure,with repositioning of the intraocular lens(IOL)from the ciliary sulcus into its preferred habitat inside the capsular bag.METHODS:This is a case series,prospective,and interventional study.The technique was first performed on an aphakic high myope with a closed posterior capsule for 18 y.Afterwards,five patients with recurrently displaced sulcus IOLs for a range of 1 mo to 7 y were performed for the same technique.During surgery,identifying a"telltale white line"was an important landmark for detecting the site of major adhesions between the edge of the capsulorhexis and the posterior capsule.These adhesions were freed using combined manual and viscoelastic dissection,followed by an easier freeing of adhesions along the whole capsular bag.The IOL was safely implanted,exchanged,or introduced from the sulcus into the fibrotic and closed capsular bag.Patients were followed up for a period ranging from 6 to 17 mo postoperatively.RESULTS:All the patients experienced a remarkable improvement in their subjective refraction.Slit lamp examination showed a postoperative centralized IOL in the bag.The follow up visits confirmed visual and IOL stability.CONCLUSION:This newly-introduced surgical technique facilitates the reopening of the empty yet intact capsular bag that has been closed by fibrotic proliferations,with secured implantation of the IOL inside the capsular bag.Patients with inadvertent implantation of IOLs into the ciliary sulcus,yet having an intact capsular bag,can benefit from this technique.
基金supported by the State Key Program of National Natural Science of China (No. 11232009)the Shanghai Leading Academic Discipline Project (No. S30106)
文摘One of the important issues in the system identification and the spectrum analysis is the frequency resolution, i.e., the capability of distinguishing between two or more closely spaced frequency components. In the modal identification by the empirical mode decomposition （EMD） method, because of the separating capability of the method, it is still a challenge to consistently and reliably identify the parameters of structures of which modes are not well separated. A new method is introduced to generate the intrin- sic mode functions （IMFs） through the filtering algorithm based on the wavelet packet decomposition （GIFWPD）. In this paper, it is demonstrated that the CIFWPD method alone has a good capability of separating close modes, even under the severe condition beyond the critical frequency ratio limit which makes it impossible to separate two closely spaced harmonics by the EMD method. However, the GIFWPD-only based method is impelled to use a very fine sampling frequency with consequent prohibitive computational costs. Therefore, in order to decrease the computational load by reducing the amount of samples and improve the effectiveness of separation by increasing the frequency ratio, the present paper uses a combination of the complex envelope displacement analysis （CEDA） and the GIFWPD method. For the validation, two examples from the previous works are taken to show the results obtained by the GIFWPD-only based method and by combining the CEDA with the GIFWPD method.
文摘In this manuscript, the authors have studied the Disc Displacement (DD) status of patients with acute Closed Lock (CL) to determine differences between DD with Reduction (DDwR) and DD without Reduction (DDwoR). Among the acute CL patients who visited our hospital within 2 weeks of the onset of CL, we studied 10 patients whose CL was released (DDwR) and 13 patients whose CL was not released (DDwoR). The DDwoR group was significantly older than the DDwR group. Although the mouth opening distance was significantly greater in the DDwoR group than in the DDwR group, the two groups were identical in the duration of CL. Sagittal MRI images showed no significant differences between the two groups in disc length and disc thickness (anterior band, intermediate zone, and posterior band). Multisection sagittal and coronal images identified lateral DD in 7 of the 10 patients in the DDwR group, although no specific direction of the DD was observed in the DDwoR group. Furthermore, deformation of the medial disc was common in the DDwoR group but uncommon in the DDwR group.
