ObjectiveTo analyze the subfoveal choroidal thickness in retinitis pigmentosa (RP) patients and to evaluate the correlation between the subfoveal choroidal thickness (SCT) and visual function. MethodsTotally 42 RP patients (84 eyes) and 49 age and diopter-matched normal controls (98 eyes) were enrolled in this study. All the patients were taken the enhanced depth imaging technique of optical coherence tomography (EDI-OCT) examination for the measurement of the SCT. The covariate analysis was used to analyze the interaction effect between age and group. Then the SCT was amended. The RP patients were examined by 30°visual field test (T32 or LVC program) and electroretinogram (ERG) test. 32 eyes examined by T32 program, 52 eyes examined by LVC program. The waveform of ERG, mean sensitivity (MS) and mean defect (MD) were recorded. The relationship of SCT, MS and MD were analyzed by Pearson correlation analysis. ResultsThe SCT of RP patients and controls were (223.12±69.59), (288.29±52.36) μm. The covariate analysis of covariance with different age group interaction was not statistically significant (F=1.619, P=0.205), as amended SCT of RP patients and controls were (217.34±6.60), (293.20±6.00) μm, respectively. The SCT was decreased in RP patients (t=7.042, P < 0.001). Among 84 eyes, bright cone response weaken in 35 eyes, scotopic rod response weaken in 31 eyes. The difference of SCT in different ERG waveform was not significant (t=-0.976, -1.584; P=0.332, 0.117). The MS and MD of 32 eyes using T32 program were (9.05±6.42), (18.84±6.30) dB, the SCT was (209.83±71.48) μm; the MS and SCT of 52 eyes using LVC program were (7.14±5.03) dB and (228.32±66.32) μm. The SCT was related to MS (r=0.494, P=0.003) and MD (r=-0.448, P=0.009) in eyes using T32 program. There was no correlation between SCT and MD in eyes using LVC program (r=-0.232, P=0.095). ConclusionsThe SCT of RP patients is thinner than that of normal controls. The SCT of RP patients is related to MS and MD of T32 program, but not correlated to ERG waveform and MS of LVC program.
ObjectiveTo observe the OCT image characteristics of the posterior cortical anterior vitreous capsular bag (PPVP) in human eyes.MethodsA retrospective clinical study. From May 2012 to February 2017, 107 PPVP patients (173 eyes) diagnosed by OCT in Ophthalmology Department of The Third People's Hospital of Chengdu were included in the study. One hundred and three eyes underwent examination of frequency-domain OCT (SD-OCT) and 70 eyes underwent examination of frequency-scanning light source OCT (SS-OCT), respectively. SD-OCT the German Heidelberg Spectralis OCT instrument. SS-OCT was performed by the vitreous enhancement scan mode of Japan's Topcon DRI OCT instrument. The differences of different types of PPVP OCT imaging and image characteristics were observed.ResultsSD-OCT and SS-OCT showed that the PPVP structure was clear and manifested as macular weakly reflective in the shape of a boat-shaped cavity, the front boundary was vitreous collagen, and the rear boundary was vitreous cortex. There was a weakly reflective Martegiani area on the nasal side of PPVP, and there was a connection channels between them. The two examinations showed a similar pattern, but SS-OCT with the clearer imaging of PPVP.ConclusionsThe OCT image of PPVP in the human eye is characterized by an anterior weakly reflecting boat-shaped cavity in the macula, with anterior border of vitreous collagen and posterior border of vitreous cortex. Martegiani area is located on the nasal side.
Objective To compare the predicted efficiency of macular hole closure index (MHCI) calculated by 2 different methods for postoperative anatomical outcomes after idiopathic macular hole (MH) surgery. Methods This is a prospective exploratory clinical study. A total of 63 patients (63 eyes) with idiopathic MH, who received vitrectomy, inner limiting membrane peeling and gas tamponade, were enrolled in this study. All the patients received optical coherence tomography (OCT) examination at each visit to measure the MHCI using the formula MHCI=（M+N）/BASE, M and N is the distance from outer limiting membrane break points to the beginning points of detached photoreceptor from retinal pigment epithelium of both side of the hole, respectively. BASE is the length of MH base. MHCI1 was measured by built-in caliper of OCT software, MHCI2 was measured by ImageJ software. The minimum macular diameter (MHD) was measured by built-in caliper of OCT software. Based on the OCT images, the anatomical outcomes were classified grade A (bridge-like shape closure), grade B (complete closure) and grade C (poor closure). Grade A and B are considered as good closure, grade C as poor closure. Patients were followed up at 3, 6 and 12 months after surgery. The closure grades at last visit were the final outcome. The relationship between MHCI1, MHCI2 and closure grades was analyzed. And the predicted efficiency of MHD, MHCI1 and MHCI2 for anatomical outcomes after the surgery was studied. Results The mean MHCI1 was 0.68±0.21 (0.30-1.35), MHCI2 was 0.95±0.26 (0.41-1.55), and MHD was (476.24±210.18) μm (127-956 μm). MHCI1 and MHCI2 were both negative correlated with the closure grades (r=−0.665, −0.691; P＜0.001). The receiver operating characteristic (ROC) curve analysis of MHCI1, MHCI2 and MHD for the prediction of good or poor closure showed that area under the curve (AUC) was 0.928, 0.957 and 0.916 respectively, and 0.505, 0.67 and 559 μm were set as the lower cut-off value. The sensitivity was 96.2%, 92.3% and 90.9% respectively, and specificity was 81.8%, 72.7% and 76.9% respectively. Accordingly, the ROC curve analysis for the prediction of grade A or B closure showed that AUC was 0.840, 0.847 and 0.653 respectively, and 0.705, 0.965 and 364 μm were set as the upper cut-off value. The sensitivity was 80.0%, 82.9%, 63.4% respectively and specificity was 75.0%, 85.7%, 65.9%. Conclusion MHCI1 and MHCI2, measured by built-in caliper of OCT software or ImageJ software, both have good predictive efficiency for the anatomical outcomes of MH surgery.
ObjectiveTo quantitatively analyze the changes of choroidal capillaries in chronic central serous chorioretinopathy (CCSC) before and after half-dose photodynamic therapy (PDT).MethodsA retrospective cohort study. Nineteen patients (21 eyes) with CCSC were enrolled in this study from November 2017 to September 2018 in People’s Hospital of Wuhan University. Among them, there were 14 males (15 eyes) and 5 females (6 eyes), with diseases course over than 6 months. All patients underwent half-dose PDT. Twenty normal subjects (40 eyes) matched with age and sex in CCSC group were taken as controls. The subfoveal choroidal thickness (SFCT) was measured by Heidelberg depth enhanced imaging-OCT before and after PDT treatment in CCSC patients and in normal subjects. Spectral-domain OCT (Retina map) and Angio-OCT angiography (3 mm×3 mm) were arranged for all subjects at the same time. Macular fovea retinal thickness (CMT) was recorded under OCT-Retina map mode, and Angio-OCT 3 mm×3 mm choroidal capillary images were binarized using Image J software, and calculating the area ratio of low pixel area as flow signal void (FSV). BCVA, spectral-domain OCT and Angio-OCT were performed 1 week and 1, 3 months after PDT with the same equipment and methods before PDT. The changes of CMT, SFCT, FSV and BCVA in CCSC patients before and after PDT treatment were compared. Pearson correlation analysis was used to analyze the correlation between FSV and SFCT, age.ResultsThe average CMT, SFCT and FSV in CCSC patients increased significantly compared with the controls (P＜0.05). The average SFCT and FSV in CCSC patients 3 months after treatment were higher and the average CMT decreased compared with the controls (P=0.000, 0.000, 0.000). Comparison before and after PDT in CCSC patients: there were significant differences in average CMT, SFCT and FSV before and after PDT (P=0.000, 0.000, 0.000). Post Hoc multiple comparisons showed that the average CMT (P=0.000, 0.000, 0.000, 0.000, 0.000) and FSV (P=0.010, 0.000, 0.000, 0.001, 0.000) decreased significantly in all time points except for 1 month and 3 months after treatment, so as the average FSV (P=0.788, 0.702). The average SFCT decreased 1 month and 3 months after treatment compared with the baseline (P=0.024, 0.008), and there was no significant difference between before treatment and 1 week after treatment (P=0.162), and between 1 month and 3 months after treatment (P=0.687). The correlation analysis showed that there was no correlation between FSV and age in CCSC patients (r=0.052, P=0.822), but there was a correlation between FSV and age in controls (r=0.716, P=0.000).ConclusionQuantitative analysis of OCTA showes the degree of choriocapillary ischemia in the form of FSV in CCSC patients decreased after PDT treatment, however, which is still higher than normal controls.
With the development of ophthalmic optical coherence tomography (OCT) and OCT angiography (OCTA), including the improving of light source, resolution, scanning depth and upgrade of analysis softwares, they can more accurately display the structure of retinal layers and give accurate quantitative measurement. In neuro-ophthalmic diseases, the OCT indicators (the thickness of retinal nerve fiber layer around optic disc and plexus layer in macular gangle cells) and OCTA indicators (the blood flow density of capillaries around optic disc, superficial and deep capillaries in macular area, and the area of foveal avascualr zone) had special changes. It has important value in the differential diagnosis of central nervous system diseases and retinal diseases with visual dysfunction as the first symptom, the diagnosis and differential diagnosis of neuro-ophthalmic disease, the evaluation of progression of neurodegenerative diseases. Neuro-ophthamologists should pay more attention to the exploration and application of OCT and OCTA in the field of neuro-ophthalmology.
Objective To observe the characteristics of spectral-domain optical coherence tomography (SD-OCT) for leakage point in acute central serous chorioretinopathy (CSC). Methods A total of 21 acute CSC patients (21 eyes) were enrolled in this retrospective study, including 17 men (17 eyes) and 4 women (5 eyes). The mean age was (47.3±8.8) years (range 35 - 66 years). The mean duration was (1.6±0.8) months (range 0.5 - 3.0 months). All patients were underwent mydriatic fundus photography, SD-OCT examination and fluorescein fundus angiography (FFA). SD-OCT and FFA images were carefully compared to observe the SD-OCT examination characteristics of fluorescence leakage point. Results 21/21 eyes had one fluorescein leakage point. In addition to serous retinal detachment, leakage point in the SD-OCT examination showed retinal pigment epithelium (RPE) protrusion in 10 eyes (47.6％), RPE detachment in 7 eyes (33.3％), highly reflective areas suggesting fibrinous exudate in the subretinal space in 3 eyes (14.3％), and RPE defect in 1 eye (4.8％). Conclusion The SD-OCT characteristics of acute CSC include RPE protrusion, RPE detachment, highly reflective areas suggesting fibrinous exudate in the subretinal space and RPE defect.
ObjectiveTo observe the abnormal clinical manifestations of retinal blood vessels and the characteristic image characteristics of optical coherence tomography (OCT) in young myopia. MethodsA case observation study. From July to December 2020, 523 young patients with different myopia refractive powers who were treated in Department of Ophthalmology of The Second Hospital of Hebei Medical University were included in the study. Among them, 277 were males and 246 were females; the median age was 19.0 (5.0) years. All the affected eyes underwent best corrected visual acuity (BCVA), frequency domain OCT (SD-OCT) examination and axial length (AL) measurement. The BCVA examination was performed using the Snellen eye chart. The median myopia refractive power of the affected eye was 5.00 (3.25) D. Among them, low myopia, moderate myopia, and high myopia were 227, 405, and 414 eyes, respectively. The average AL of the affected eye was 25.6±2.8 mm. The frequency domain OCT instrument was used to scan the temporal side of the retina, the upper and lower nasal vascular arches and the macular fovea radially. The images of retinal vascular cysts, microfolds, and lamellar hole were acquired and stored. The prevalence, composition ratio, distribution rule and OCT imaging characteristics of retinal paravascular abnormalities were observed and analyzed. The distribution of paravascular abnormalities in the retina was compared by the χ2 test; the age, refractive power, and AL of different paravascular abnormalities were compared by the K-W rank sum test. ResultsOf the 1046 different diopters of myopic eyes, there were 227 eyes in mild myopia, 405 eyes in moderate myopia and 414 eyes in high myopia. Retinal paravascular abnormalities were detected by SD-OCT in 40 eyes (3.8%,40/1046). The prevalence of retinal paravascular abnormalities in moderate myopia was 0.7% (3/405) and high myopia was 8.9% (37/414). No retinal paravascular abnormalities were observed in mild myopia.Retinal paravascular cysts in 40 eyes (3.8%, 40/1046), retinal paravascular microfolds in 28 eyes (2.7%, 28/1046) and retinal paravascular lamellar holes in 13 eyes (1.2%, 13/1046). Of 40 eyes with retinal paravascular abnormalities, retinal paravascular cysts in all 40 eyes (100.0%, 40/40), retinal paravascular microfolds in 28 eyes (70.0%, 28/40) and retinal paravascular lamellar holes in 13 eyes (32.5%, 13/40). Twelve eyes with simple cyst cavity (30.0%, 12/40); 15 eyes were with cyst cavity with micro-wrinkles (37.5%, 15/40); 13 eyes were with cyst cavity, micro-wrinkles and lamellar holes (32.5%, 13/40). The temporal vascular arch retinal paravascular cysts (χ2=25.664), microfolds (χ2=14.973), and lamellar holes (χ2=13.499) were significantly more than those on the nasal side, and the difference was statistically significant (P＜0.001). ConclusionsThe total prevalence of retinal paravascular abnormalities in young myopia is 3.8%; it can occur in both moderate and high myopia. The paravascular cyst may be the earliest pathology of paravascular abnormalities in the retina. The three paravascular abnormalities are mostly distributed along the temporal arch of the retina.
ObejctiveTo investigate the consistency and reproducibility of macular perfusion parameters in early diabetic retinopathy (DR) using optical coherence tomography angiography (OCTA).MethodsA prospective cross-sectional observational study. Forty-six patients (46 eyes) diagnosed with mild nonproliferative DR were included in this study. There were 24 males and 22 females, with the mean age of 59.16±10.32 years. Two macular scan sizes of 3 mm×3 mm and 6 mm×6 mm were performed by the same operator, and the same test was performed by another operator. The superficial retinal layer (SRL) and deep retinal layer (DRL) in the foveal avascular zone (FAZ) and vessel density (VD) were quantified. The consistency of the two scan sizes and the reproducibility of the same scan size were also evaluated. The consistency was determined by the intraclass correlation coefficient (ICC). If the intraclass correlation coefficient (ICC)＞0.80, consistency was good; if 0.4≤ICC＜0.8, consistency was general; if ICC＜0.40, consistency was poor.ResultsIn the 3 mm×3 mm and 6 mm×6 mm scanning sizes, the mean results of the two examiners were calculated. The FAZ of SRL were 0.39±0.13 mm2 and 0.42±0.15 mm2, FAZ of DRL were 0.74±0.22 mm2 and 0.89±0.23 mm2. The VD of SRL were (32.23±2.86)% and (31.91±3.01)%, VD of DRL were (43.73±4.64)% and (45.12±5.49)%. The consistency analysis showed that the ICC of SRL-FAZ and DRL-FAZ were 0.920 and 0.812, respectively; the ICC of VD were 0.833 and 0.830, respectively. The consistency was good. The reproducibility analysis of different examiners in the same scan size was better in the consistency of SRL FAZ and VD.ConclusionOCTA in two scanning sizes to measure FAZ and VD of early DR has good consistency and reproducibility.
Objective To explore the consistency and significance of optical coherence tomography (OCT) and clinical and histopathological findings in adoptively transferred uveitis in mice. Methods The adoptively transferred experimental autoimmune uveitis (EAU) model was established by intraperitoneal injection of antigen-specific T cells in C57BL/6 mice. Since 9 days after transferred, inflammation of eyes was observed by indirect ophthalmoscope with +90D lens and record clinical scores every 3 days. The disease was divided into 6 phases including onset phase, early phase, pre-peak phase, peak phase, resolution phase and late phase of EAU, which respectively corresponding to clinical score 0.5, 1.0, 1.5 - 2.0, 2.5 - 3.0, 1.0 - 2.0 and less than 1.0. Since 9 days after transferred, the retina and retinal thickness (RT) was measured by spectralis OCT about 1 disc from the disc edge in 10 time points including 9, 11, 16, 21, 25, 30, 35, 40, 50 and 60 days after transferred. The OCT score was recorded as from 0.0 to 4.0. After transferred 9, 21 and 60 days, the mice were killed and eye balls were examined in histology. OCT score, clinical score and histology in the mouse were compared and analyzed. Results The disease was divided into onset phase, early phase, pre-peak phase and peak phase of EAU, which respectively corresponding to 9, 16, 21 and 26 days after transferred. In four phases, OCT score were 0.5, 1.0, 2.0 and 4.0 respectively. After transferred 30 days, which was in resolution phase of EAU, the inflammation cells in vitreous were decreased and OCT score was 3.0. After transferred 60 days, which was in late phase of EAU, inflammation cells in vitreous were disappeared and retina was atrophic topically. The histology showed the vitreous has slight inflammation cells and retinal structure was normal at onset of EAU. The vitreous has massive inflammation cells and retina structure was disorder at pre-peak of EAU. And in resolution phase of EAU, the inflammation cells in vitreous were slightly and retina was atrophic and thinned. The data in this study demonstrated that OCT score was well correlated with clinical score in EAU (r=0.957 9, P < 0.000 1). Conclusion OCT and clinical and histopathological findings in adoptively transferred uveitis in mice were consistency and OCT is contribute to evaluate the disease dynamically and quantifiably.
Optical imaging technology of ocular fundus, including fundus fluorescein angiography (FFA), optical coherence tomography (OCT) and fundus autofluorescence (FAF), is growing at an unprecedented speed and scale and is integrating into the routine clinical management of ocular fundus diseases, such as diagnosis, treatment, and mechanism study. While FFA allow us to observe the retinal and choroidal blood circulation, OCT and FAF are non-invasive, fast and quantifiable measurement; such techniques show even more unique advantages and are favored tools. All these retinal imaging technologies, together with a variety of retinal function assessments, bring us into the era of big data of ocular fundus diseases. All of these developments are the challenges and opportunities for the operator and user of these fundus optics imaging technologies. In order to improve its clinical applications and allocate resources rationally, we need to understand the optical properties of these retinal imaging technologies, and standardize diagnosis behavior. This is a continuous learning process needs to continue to explore.