VISUAL FIELD DECAY IN NORMAL SUBJECTS AND IN CASES OF CHRONIC GLAUCOMA (V) and REGRESSION ANALYSIS OF THE CENTRAL VISUAL FIELD IN CHRONIC GLAUCOMA CASES (VI)

2009 ◽  
Vol 60 (S153) ◽  
pp. 23-28
Keyword(s):  
Regression Analysis ◽  
Visual Field ◽  
Normal Subjects ◽  
Central Visual Field ◽  
Chronic Glaucoma ◽  
Field Decay

Topographic Spatial Summation in Glaucoma

2007 ◽  
Vol 17 (4) ◽  
pp. 538-544 ◽  
Author(s):  
M. Gonzalez De La Rosa ◽  
M. Gonzalez-Hernandez ◽  
V. Lozano Lopez ◽  
D. Perera Sanz
Keyword(s):  
Visual Field ◽  
Dynamic Range ◽  
Normal Population ◽  
Spatial Summation ◽  
Normal Subjects ◽  
Stimulus Luminance ◽  
Central Visual Field ◽  
Visual Field Examination ◽  
K Value ◽  
Local Defects

Purpose Stimulus luminance (L) and area (A) are related by the equation LxAk=constant. The authors evaluated the k value at 66 positions of the central visual field in patients with glaucoma, to modify L and A simultaneously in order to examine advanced glaucomas with a bigger dynamic range. Methods The luminance limitation of a computer screen with automatic photometric control was compensated for by increasing the stimulus area in the range between 0 and 17 dB, using the k topographic values previously calculated on normal subjects. Four initial series of 21, 12, 10, and 10 glaucomas were sequentially examined with the Octopus 311 in which the stimulus size cannot be freely changed during the examination, and with the experimental method (Pulsar-SAP) modifying stimulus sizes to equal the results. k Final estimation was verified in 60 new cases. Results k Values increase progressively with defect deepness. Values higher than those of the normal population with equivalent topographic differences were obtained. Correlation between indices was as follows: MD: r=0.94 (p<0.0001); square root of the loss of variance (sLV): r=0.93 (p<0.0001). Frequency of local defects was similar in both procedures. Average topographic differences between thresholds were usually less than 1 dB. The average threshold difference favored Pulsar-SAP by 0.45 dB at those points where the average threshold of both examinations was less than 18 dB and 0.37 dB where such average was higher than or equal to 18 dB. Conclusions k Value is higher in patients with glaucoma than in normal subjects, although the topographic features are similar. It is feasible to design a scale combining stimulus luminance and sizes to use screens with relative low brightness as surfaces for visual field examination.

scholarly journals Metamorphopsia Score and Central Visual Field Outcomes in Diabetic Cystoid Macular Edema

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Agnieszka Kalinowska ◽  
Katarzyna Nowomiejska ◽  
Agnieszka Brzozowska ◽  
Ryszard Maciejewski ◽  
Robert Rejdak
Keyword(s):  
Visual Field ◽  
Macular Edema ◽  
Visual Function ◽  
Cystoid Macular Edema ◽  
Normal Subjects ◽  
Test Method ◽  
Central Visual Field ◽  
Significant Difference ◽  
Function Loss ◽  
Loss Variance

Aim. To detect abnormality of the visual function in naïve patients with cystoid diabetic macular edema (DME) using M-charts, Amsler test, and white on white (W/W) and blue on yellow (B/Y) perimetry. Methods. There were 64 eyes included in the study: 30 eyes with DME, 22 eyes with diabetes without DME, and 12 eyes of normal subjects. Conventional W/W perimetry and B/Y perimetry were performed within the central 10° of the visual field. To assess metamorphopsia, Amsler test and M-charts were used. Results. The rate of detection of metamorphopsia was 37% with Amsler test examination and 50% with M-charts. Specificity of both tests was 100%. We found a significant difference between vertical scores of M-charts in all groups, but not in horizontal scores (p<0.0001). Mean defect (MD) was 8.9 dB and 3.6 dB and loss variance (LV) 4.8 dB and 3.3 dB (p<0.0001). Conclusions. M-chart is more sensitive than Amsler test method for detection of metamorphopsia. The MD and LV are higher in b/y in comparison to W/W perimetry. B/Y perimetry and M-charts are more sensitive than conventional methods for detecting the visual function loss in cystoid DME.

scholarly journals Central Visual Field Defects in Patients with Distinct Glaucomatous Optic Disc Phenotypes

2021 ◽  
Vol 223 ◽  
pp. 229-240
Author(s):  
Eren Ekici ◽  
Sasan Moghimi ◽  
Huiyuan Hou ◽  
James Proudfoot ◽  
Linda M. Zangwill ◽  
...  
Keyword(s):  
Visual Field ◽  
Optic Disc ◽  
Visual Field Defects ◽  
Central Visual Field ◽  
Field Defects

scholarly journals Trends in the Retinal Nerve Fiber Layer Thickness Changes with Different Degrees of Visual Field Defects

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Wenhui Geng ◽  
Dabo Wang ◽  
Jing Han
Keyword(s):  
Regression Analysis ◽  
Visual Field ◽  
Linear Regression ◽  
Nerve Fiber ◽  
Retinal Nerve Fiber Layer ◽  
Linear Regression Analysis ◽  
Simple Linear Regression ◽  
Fiber Layer ◽  
Simple Linear Regression Analysis ◽  
Rnfl Thickness

Purpose. To explore the disease progression of primary open-angle glaucoma (POAG) in individuals with different degrees of VF defects by analyzing the trends in retinal nerve fiber layer (RNFL) changes at each stage. Methods. A total of 39 patients (77 eyes) were divided into three groups based on the severity of glaucomatous visual field (VF) loss: the first group included patients with mild baseline VF defects (mild group; n = 21 eyes). The second group included patients with moderate VF defects (moderate group; n = 18 eyes). The third group included patients with severe baseline VF defects (severe group; n = 38 eyes). For all patients, slit-lamp biomicroscopy of the anterior and posterior segments and detailed fundus and optic disc inspections were performed, the intraocular pressure (IOP) was measured by Goldman tonometry, best-corrected visual acuity (BCVA) was measured, the RNFL thickness was measured by OCT, and the VF was assessed by the Octopus perimeter. All the groups were followed up postoperatively for 18 months. Results. The mean RNFL thickness was recorded for all the visits. Using simple linear regression analysis, we found that the R2 values of the three groups were 0.988, 0.982, and 0.814, respectively, and the slopes of mean RNFL thickness changes for mild, moderate, and severe baseline VF defects were −0.088, −0.082, and −0.015, respectively. Moreover, we used simple linear regression analysis to explore whether and how the speed of RNFL thinning differs across groups. The R2 values of the three groups were 0.982, 0.978, and 0.805, respectively, and the slopes for mild, moderate, and severe baseline VF defects were 0.089, 0.085, and 0.017, respectively. Conclusion. The rate of RNFL thinning is linear; RNFL thinning is the fastest in individuals with mild baseline VF defects, followed by those with moderate baseline VF defects. In individuals with severe VF defects, changes in the RNFL thickness do not appropriately reflect the progression of the disease. The clinical trial is registered with ChiCTR2000028975.

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