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A virtual model of the retina based on histological data as a tool for evaluation of the visual fields

Annals of Eye Science 2017年第1期2卷 113-126页

作者： Francisco-Javier Carreras Ángel V.Delgado José.L.García-Serrano Department of Surgery Medical School2Department of Applied PhysicsSchool of SciencesUniversity of GranadaGranadaSpain Hospital Clínico San Cecilio University of GranadaGranadaSpain School of Computer Science Department of Computer Science and Artificial IntelligenceUniversity of GranadaGranadaSpain

Background:To settle the fundamentals of a numerical procedure that relates retinal ganglion-cell density and threshold sensitivity in the visual *** sensitivity of a generated retina and visual pathways to virtual stimuli are simulated,and the conditions required to reproduce glaucoma-type defects both in the optic-nerve head(ONH)and visual fields are ***:A definition of selected structural elements of the optic pathways is a requisite to a translation of clinical knowledge to computer programs for visual field *** program is able to generate a database of normalized visual *** relationship between the number of extant receptive fields and threshold sensitivity is plotted for background sensitivity and corresponding automated perimetry.A solution in two planes to the 3D distribution of axons in the ONH is *** fields with induced damage in the optic disc are comparable in pattern and quantity to glaucomatous ***:The two-level simulation of the ONH facilitates the analysis of optic-cup/retinal *** can generate the virtual optic pathways tailored to the age and morphology of the patient’s eye,and it is possible to reproduce glaucomatous damage by“reverse engineering”*** virtual cortical model renders a quantitative relationship between visual defect and neural ***:A two-level computing of the retina/optic nerve facilitates the analysis of neuroretinal defects and can be incorporated to automatic perimeters to facilitate visual field analysis.

关键词： Computer modeling early optic pathways neuroretinal defects threshold sensitivity visual fields

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Macular integrity assessment to determine the association between macular microstructure and functional parameters in diabetic macular edema

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International Journal of Ophthalmology(English edition) 2018年第7期11卷 1185-1191页

作者： Jian-Wei Wang Chuan-Hong Jie Yong-Jian Tao Ning Meng Yuan-Chun Hu Zheng-Zheng Wu Wen-Jing Cai Xi-Mei Gong Eye Hospital China Academy of Chinese Medical Sciences

AIM： To respectively evaluate macular morphological features and functional parameters by using spectraldomain optical coherence tomography（SD-OCT） and macular integrity assessment（MAIA） in patients with diabetic macular edema（DME）. METHODS： This prospective, non-controlled, open study included 61 eyes of 38 consecutive patients with DME. All patients underwent best-corrected visual acuity（BCVA） measurement, MAIA microperimetry, and SDOCT. DME morphology, including central retinal thickness（CRT） and central retinal volume（CRV）; integrity of the external limiting membrane（ELM） and photoreceptor inner segment/outer segment（IS/OS） junction; and the deposition of hard macular exudates were assessed within a 1000-μm central subfield area. MAIA microperimetry parameters evaluated were average threshold（AT）-retinal sensitivity, macular integrity index（MI）, fixation points within a circle of radius 1°（P1） and 2°（P2）, and bivariate contour ellipse area considering 63% and 95% of the fixation points（A63 and A95, respectively）. RESULTS： MI was significantly higher in eyes with disrupted ELM or IS/OS, compared with eyes with intact ELM and IS/OS. Values of BCVA（log MAR）, total AT, AT within 1000-μm diameter, P2, A63, A95, and CRT were significantly worse in eyes with disrupted IS/OS, compared with eyes with intact IS/OS. The values of BCVA（log MAR）, AT within 1000-μm diameter, and CRT were significantly worse in eyes with disrupted ELM, compared with eyes with intact ELM. These parameters were not significantly different between eyes with or without hard macular exudate deposition. CRV was not significantly different in the presence or absence of the integrity of ELM, IS/OS, or deposition of hard macular exudates. At the center, nasal and temporal sectors of the fovea, significant negative correlations were observed between retinal thickness and AT of the corresponding area. At the inferior and superior sectors of the fovea, no correlations were observed between retinal thickn

关键词： diabetic retinopathy/complications macular edema visual fields retina/physiopathology optical coherence tomography

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Resection of bilateral occipital lobe lesions during a single operation as a treatment for bilateral occipital lobe epilepsy

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World Journal of Clinical Cases 2021年第34期9卷 10518-10529页

作者： Yan-En Lyu Xiao-Fei Xu Shuang Dai Min Feng Shao-Ping Shen Guo-Zhen Zhang Hong-Yan Ju Yao Wang Xiao-Bo Dong Bin Xu Seventh Clinical School of Medicine Beijing University of Chinese MedicineTongchuan 727031Shaanxi ProvinceChina Neurosurgery and Epilepsy Centre Dongzhimen HospitalBeijing University of Chinese MedicineBeijing 100700China Neurosurgery and Epilepsy Centre General Hospital of Beijing Military Commanding RegainBeijing 100700China

BACKGROUND Neurosurgical treatment of severe bilateral occipital lobe epilepsy usually involves two operations several mos *** To evaluate surgical resection of bilateral occipital lobe lesions during a single operation as a treatment for bilateral occipital lobe *** This retrospective case series included patients with drug-refractory bilateral occipital lobe epilepsy treated surgically between March 2006 and November *** Preoperative evaluation included scalp video-electroencephalography(EEG),magnetic resonance imaging,and *** surgery(bilateral occipital craniotomy),epileptic foci and important functional areas were identified by EEG(intracranial cortical electrodes)and cortical functional mapping,*** were followed up for at least 5 years to evaluate treatment outcome(Engel grade)and visual *** 20 patients(12 males)were aged 4-30 years(median age,12 years).Time since onset was 3-20 years(median,8 years),and episode frequency was 4-270/mo(median,15/mo).Common manifestations were elementary visual hallucinations(65.0%),flashing lights(30.0%),blurred vision(20.0%)and visual field defects(20.0%).Most patients were free of disabling seizures(Engel grade I)postoperatively(18/20,90.0%)and at 1 year(18/20,90.0%),3 years(17/20,85.0%)and≥5 years(17/20,85.0%).No patients were classified Engel grade IV(no worthwhile improvement).After surgery,there was no change in visual function in 13/20(65.0%),development of a new visual field defect in 3/20(15.0%),and worsening of a preexisting defect in 4/20(20.0%).CONCLUSION Resection of bilateral occipital lobe lesions during a single operation may be applicable in bilateral occipital lobe epilepsy.

关键词： Drug-resistant epilepsy Occipital lobe epilepsy Bilateral lesions One-stage surgery Treatment outcome visual fields

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Sun shades and eye size in birds

Sun shades and eye size in birds

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23rd International Ornithological Congress

作者： Graham R.Martin Gadi Katzir School of Biosciences. The University of Birmingham Birmingham B15 2TT UK Dept. of Biology University of Haifa Oranim 36910 Israel

＜正＞ Width of visual field above the head was found to be correlated significantly with eye size （r/s/ = 0.92, n= 11, p＜. 001） in a sample of terrestrial birds of differing phylogeny and ecology. The species sampled fell into two groups. One - of smaller-eyed sun-observers （axial length ＜ 18mm） - has comprehensive or near comprehensive visual coverage of the celestial hemisphere and is thus unable to avoid viewing the sun. The other - of larger-eyed sun-avoiders （axial length ＞ 18mm） - has restricted visual fields and various types of

关键词： vision visual fields sunshades eye size

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