Comparison of ocular biometry and refractive outcome between ANTERION and IOL Master 700

Purpose: To assess the comparability of ocular biometry measurements and refractive outcomes between ANTERION and IOL Master 700. Methods: This comparative prospective study was conducted from December 2020 to February 2021. A total of 225 patients who had cataracts were enrolled for the study and different parameters such as anterior keratometry (Steep K, Flat K) with axis, Sim K, central corneal thickness (CCT), aqueous depth (AQD), lens thickness (LT), and axial length (AL), white?to?white (WTW) were evaluated in IOL master 700 first and then with ANTERION. Finally, 203 patients completed the 6?week follow?up and the postoperative refraction was done at the 6th week. To assess the agreement between the devices, intraclass coefficient (ICC) and Bland–Altman analysis with 95% limits of agreement (LoA) were used. To analyze the agreement for postoperative residual refractive error between the two devices, Kappa statistics were used. Results: The mean difference for steep K, flat K, and Sim K between ANTERION and IOL Master 700 were ? 0.18 +/?0.26 D, ?0.13+/? 0.28D, ?0.15 +/?0.23, respectively. The CCT, ACD, and LT also showed excellent agreement (ICC > 0.9) but the similarity for the keratometry axis was not up to the mark (ICC = 0.794). For postoperative refractive outcomes, the Kappa value was 0.437, indicating moderate agreement. Conclusion: ANTERION showed a good agreement for the majority of parameters with IOLMaster 700 in measuring ocular biometry, except for the keratometry. The accuracy of the intraocular lens power calculations was clinically acceptable with both biometers though the IOL power given by ANTERION remained slightly on the hypermetropic side.

Relationship between accommodation and lens vault following implantable contact lens surgery / 中华实验眼科杂志

Background Implantable contact lens (ICL) surgery is a primary intraocular refractive corrective surgery for high myopia.However,whether there will be enough distance between ICL and anterior face of lens to avoid the occurrence of anterior capsular cataract in non-accommodated and the largest physiological accommodated state after ICL implantation is worthy of investigation.Objective The purpose of this study was to investigate the alteration of lens vault after ICL implantation and explore the relationship between accommodation and change of lens vault.Methods A observational study was carried out.Sixty-six eyes of 33 patients with high myopia who received ICL implantation were enrolled in Affiliated First Hospital of Guiyang Medical College from May to November,2012.Best corrected visual acuity (BCVA),uncorrected visual acuity (UCVA),refractive diopter were regularly examined using synthetical optometry,and crystalline lens rise (CLR) and lens vault in non-accommodative or accommodative condition were observed by the anterior segment OCT (Visante OCT) and ultrasound biomicoscopy (UBM) before operation and 1 day,1 week,l month and 3 months after operation.Data were analyzed with SPSS version 16.0.Repeated measurement one-way analysis of variance was used to compare the differences of vision and refractive diopter among various time points.The relationship between accommodation and CLR was assessed using Pearson linear correlation.The alteration of CLR with accommodation change was analyzed by linear regression equation.Lens vault was measured and compared between non-accommodation and maximal physical accommodation status by paired t test.Results The postoperative UCVA was improved in comparison with preoperative BCVA,and the postoperative diopter was significantly lower than that of preoperation,with significant differences among various time points (F =16.904,P =0.000 ; F =1.498,P =0.000),and the diopter was stable after operation.A positive correlation was found between the alteration of CLR and accommodation under the physical accommodative stimulation in high myopic eyes (R2 =0.49,P =0.00).Under physiological accommodation,CLR elevated 20 μm for per 1.0 D accommodation.In addition,the difference of lens vault values within postoperative 3 months was statistically significant (F=16.025,P=0.000).The lens vault values lowed with the enlargement of accommodation in 48.5％ eyes,and the lens vault values increased with the enlargement of accommodation in 50.0％ eyes.However,1.5％ of the lens vault were in a stable state under the maximal physiological accommodated condition 3 months after operation.Lens vault were greater than zero in 97.0％ eyes (64/66),and only 3.0％ eyes (2/66) were zero under the maximalphysiological accommodated condition.Significant differences were seen in the lens vault between nonaccommodated and the maximal physiological accommodated state 1 day or 1 week after operation (t =4.755,P =0.000 ;t =3.327,P =0.001) ; but there was no statistical significance in 1 month or 3 months after operation (t =1.544,P=0.127,t=0.621,P=0.537).Conclusions During physiological accommodation,the alteration of CLR with accommodation in high myopic eyes.The location of ICL in the eyes is unstable within 3 months after operation.Majority of operative eyes remain enough vault in the maximal physiological accommodated state,but minority of operative eyes occur contact of ICL with the anterior surface of lens.Whether this contact causes anterior capsular cataract still needs to study.

Change of the Lordosis on Cervical Spine after Anterior Interbody Fusion with Autogenous Iliac Strut Bone Graft / 대한척추외과학회지

PURPOSE: Various methods have been used to treat traumas and diseases of the cervical vertebrae. For fractures and diseases of the cervical vertebrae, The authors of this paper sought to evaluate the effectiveness of these different methods by checking for the correction of kyphosis, seeing whether bone graft was successful, making clinical evaluation, and checking for the appropriateness of size and shape of the graft. METHODS: Of the 193 patients who visited the Department of Orthopedics at Chungnam National University Hopspital from January, 1997, to March, 2000, and had operative treatments using the anterior approach or the Smith-Robinson technique, 161 cases that were possible for follow-up were chosen for this study. Among the cases chosen, 111 cases had cervical trauma, and 50 cases had disease of the cervical vertebrae. Simple X-ray was taken to measure the curvature of the affected area and also of the overall cervical curvature(lower end of the second cervical vertebra-lower end of the seventh cervical vertebra), and the healing of the bone was evaluated. RESULTS: Normal range of overall cervical curvature is 16~38 degrees of kyphosis; the curvature after operative treatments for diseased cervical vertebrae was corrected back to the normal range from the reduced angles that existed before the operation. The bone graft was healed in all cases except one(cervical disease), and 15 cases showed prolonged healing. For clinical evaluation using the Robinson scale, 109 cases were excellent, 42 cases were good, and 10 cases were fair. CONCLUSION: Anterior interbody fusion operation of the cervical vertebrae using anterior cervical plate fixation on cases of cervical vertebrate damage and diseases performed, and for the bone graft, using grafts with the anterior surface longer than the posterior surface to induce kyphosis of the cervical vertebrae seemed to be effective. Thus, it is believed that above method is effective in inducing anatomical and functional recovery of patients with trauma and diseases of the cervical vertebrae.

Anterior Cervical Fusion with Cervical Spine Locking Plate System / 대한정형외과학회잡지

The anterior approach to arthrodesis of the cervical spine has become a widely accepted. However, anterior interbody fusion in the presence of the posterior instability may be complicated by the bone graft dislodgement, kyphotic deformity or nonunion. As an attempt to prevent this complications, anterior cervical plate after graft placement was introduced. Although, anterior cervical plates provide excellent fixation for the anterior column, potential risk for injury to the spinal cord, soft tissues or screw loosening leading to dysphagia has been reported. Morscher, of Switzerland, has developed an anterior cervical spine locking plate(CLSP) system that attempts to prevent the migration and looseing of screw by using a cross-split screw head that can be locked into the plate. The secondary advantage of this system is the limination of the required posterior cortex purchase. The authors reviewed 42 patients in whom the CLSP system was applied for the treatment of degenerative disease or trauma. With a mean followup of 18 months, all 42 patients went on to fusion. One patient had screws placed in the discal space, hardware failure occurred in two patients. There was no iatrogenic injury to the spinal cord or esophagus. In conclusion, the CLSP system provides a reliable fusion with minimal complications. It should be considered in multilevel anterior cervical arthrosis and cervical fractures.