Halfsight

Metagnosis ◽  
2020 ◽  
pp. 95-126
Author(s):  
Danielle Spencer
Keyword(s):  
Visual Field ◽  
Medical Error ◽  
Visual Field Defect ◽  
Narrative Identity ◽  
Identity Theory ◽  
Illness Narratives ◽  
Key Concepts ◽  
The Relationship ◽  
Field Defect

Here the author continues her ophthalmic narrative, describing the surprising revelation of a long-standing, yet undetected, condition—a visual field “defect.” Discussing the narrative frames of diagnosis, questions of medical error and uncertainty are addressed. The particular challenges of accounting for a retrospective revelation are explored in detail, invoking themes of narratology, communicability, intelligibility, metaphor, and semiotics. In addition, the ways in which metagnosis invokes various stances toward the relationship between narrative and identity are investigated. This chapter offers an introduction to key concepts in illness narratives, narratology, semiotics, and narrative identity theory, discussed in relation to the author’s experience.

Blindsight

Metagnosis ◽  
2020 ◽  
pp. 127-161
Author(s):  
Danielle Spencer
Keyword(s):  
Visual Field ◽  
Visual Field Defect ◽  
Philosophical Tradition ◽  
Neurological Condition ◽  
Epistemic Stance ◽  
Western Philosophical Tradition ◽  
The Relationship ◽  
Field Defect

In situating the author’s retrospective visual field “defect” revelation, this chapter begins with the neurological condition of anosognosia—being unaware of a disease—exploring its manifestations and philosophical implications. In addition, another means of understanding the author’s visual field “defect” emerges in the figure of “blindsight,” or unconscious vision. Tracing the relationship between vision and thought in the Western philosophical tradition as well as the philosophical role of blindsight, the chapter then proposes that blindsight models a particular epistemic stance encompassing the known and unknown, one which will prove useful in addressing the phenomenon of metagnosis and beyond.

scholarly journals The relationship between increased oxidative stress and visual field defect progression in glaucoma patients with sleep apnoea syndrome

2018 ◽  
Vol 96 (4) ◽  
pp. e479-e484 ◽  
Author(s):  
Erika Yamada ◽  
Noriko Himori ◽  
Hiroshi Kunikata ◽  
Kazuko Omodaka ◽  
Hiromasa Ogawa ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Visual Field ◽  
Visual Field Defect ◽  
Sleep Apnoea ◽  
Sleep Apnoea Syndrome ◽  
The Relationship ◽  
Field Defect

scholarly journals The Relationship between Glaucoma Medication Adherence, Eye Drop Technique, and Visual Field Defect Severity

Ophthalmology ◽  
2011 ◽  
Vol 118 (12) ◽  
pp. 2398-2402 ◽  
Author(s):  
Betsy Sleath ◽  
Susan Blalock ◽  
David Covert ◽  
Jennifer L. Stone ◽  
Asheley Cockrell Skinner ◽  
...  
Keyword(s):  
Medication Adherence ◽  
Visual Field ◽  
Visual Field Defect ◽  
Glaucoma Medication ◽  
The Relationship ◽  
Field Defect ◽  
Drop Technique

Comparative Study of FPA and NFPA: The relationship between the clinical characteristics and visual function impairment in patients with pituitary adenoma

2020 ◽  
Author(s):  
Jiayin Qin ◽  
Kai Li ◽  
Xijuan Wang ◽  
Yongzhen Bao
Keyword(s):  
Pituitary Adenoma ◽  
Visual Field ◽  
Visual Function ◽  
Visual Field Defect ◽  
Clinical Characteristics ◽  
Tumor Volume ◽  
Tumor Diameter ◽  
Function Impairment ◽  
The Relationship ◽  
Field Defect

Abstract Background To investigate the relationship between the clinical characteristics and visual function impairment in patients with functioning pituitary adenoma (FPA) and non-functioning pituitary adenoma(NFPA). Methods Case series study. The medical records of pituitary adenomas patients were reviewed retrospectively. Cases with ophthalmic evaluation were enrolled. Tumor types were confirmed by histologic analysis in all cases. The diameter measured on MRI were recorded. The tumor volume was calculated. All the observation indexes of the two groups were compared. The correlation between visual field and tumor volume was studied and the scatter plot was drawn. Results 30 in FPA and 43 in NFPA group were enrolled. There were 23% of FPA and 41.9% of NFPA had the first symptom in eyes, the former was higher than the latter. The best corrected visual acuity of FPA was better than that of NFPA group. There were 34 (56.7%) and 73 (84.9%) eyes had visual field defect respectively. The visual field defect of FPA was lighter than that of NFPA. Except for the anteroposterior diameter, there was no difference in the other dimensions of tumor diameter between the two groups. The tumor volume of FPA was smaller than that of NFPA group. The tumor size exhibited positive correlation with MD and negative correlation with MS in both groups. Conclusions The tumour growth of FPA was slower and less visual function deficiency than that of NFPA. Special attention on multi-types of visual field defects caused by FPA and NFPA Is needed.

Visual Field Examination in Glaucoma Patients : Humphrey Visual Field Analysis vs Amsler Grid

2017 ◽  
Vol 43 (2) ◽  
pp. 124
Author(s):  
Ivana Tanoko ◽  
Fifin L Rahmi
Keyword(s):  
Visual Field ◽  
Visual Field Defect ◽  
Glaucoma Patient ◽  
Field Analysis ◽  
Glaucomatous Optic Neuropathy ◽  
Visual Field Examination ◽  
Cross Sectional ◽  
Rnfl Thickness ◽  
Amsler Grid ◽  
Field Defect

Introduction and Objective: Glaucoma is the leading cause of global irreversible blindness, signed by glaucomatous optic neuropathy related to visual field defect. The purpose of the study is comparing visual field defect examination using HVFA to Amsler Grid in glaucoma patient at dr. Kariadi Hospital. Methods: This is a cross-sectional study. Amsler Grid were performed to the patients who have reliable HVFA at last 6 months and presented as descriptive analytic results. Result: There were 40 eyes involved in this study from 27 patients (15 men, 12 women), 26-68 years old and visual acuity 1/60-6/6. Seventeen eyes showed visual field defect in HVFA and Amsler Grid had average MD - 24.97 dB, CDR 0.89 and RNFL thickness 51.74. We found that 11 eyes didn’t showed in both of examination had average MD -8.06, CDR 0.63 and RNFL thickness 103.23 and those parameters are significantly different to the 17 eyes before (p<0.05). Data from 12 eyes that showed visual field defect only one of examination (9 only in HVFA and 3 in Amsler Grid) didn’t show difference statistically each other. Conclusion: HFVA and Amsler Grid seemed to be comparable in detecting visual field defect in advanced glaucoma.

scholarly journals Acute Zonal Occult Outer Retinopathy: Vision Loss in an Active Duty Soldier

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Courtney M. Crawford ◽  
Bruce A. Rivers ◽  
Mark Nelson
Keyword(s):  
Visual Field ◽  
Visual Field Defect ◽  
Vision Loss ◽  
Fundus Autofluorescence ◽  
Final Diagnosis ◽  
Active Duty ◽  
Visual Field Defects ◽  
Fundus Photographs ◽  
Optical Coherence Tomograph ◽  
Field Defect

Objective. To describe a case of acute zonal occult outer retinopathy (AZOOR) in an active duty patient.Methods. In this paper we studied fundus photographs, optical coherence tomograph, Humphrey visual field 30-2, fundus autofluorescence images, fluorescein angiograms, and electroretinography.Results. Exam findings on presentation: a 34-year-old American Indian female presented with bilateral photopsias, early RPE irregularity, and an early temporal visual field defect. Progression RPE damage and visual field defect along with ERG findings support final diagnosis of AZOOR.Conclusion. AZOOR may initially be identified as a broader category of disease called the “AZOOR complex of disorders”. Specific visual field defects, ERG results, and clinical exam findings will help distinguish AZOOR from other similar disorders.

scholarly journals Association of ocular blood flow and contrast sensitivity in normal tension glaucoma

2021 ◽  
Author(s):  
David Kuerten ◽  
Matthias Fuest ◽  
Peter Walter ◽  
Babac Mazinani ◽  
Niklas Plange
Keyword(s):  
Blood Flow ◽  
Visual Field ◽  
Contrast Sensitivity ◽  
Visual Field Defect ◽  
Prospective Trial ◽  
Normal Tension Glaucoma ◽  
Ocular Blood Flow ◽  
Retinal Blood Flow ◽  
Control Group ◽  
Field Defect

Abstract Purpose To investigate the relationship of ocular blood flow (via arteriovenous passage time, AVP) and contrast sensitivity (CS) in healthy as well as normal tension glaucoma (NTG) subjects. Design Mono-center comparative prospective trial Methods Twenty-five NTG patients without medication and 25 healthy test participants were recruited. AVP as a measure of retinal blood flow was recorded via fluorescein angiography after CS measurement using digital image analysis. Association of AVP and CS at 4 spatial frequencies (3, 6, 12, and 18 cycles per degree, cpd) was explored with correlation analysis. Results Significant differences regarding AVP, visual field defect, intraocular pressure, and CS measurement were recorded in-between the control group and NTG patients. In NTG patients, AVP was significantly correlated to CS at all investigated cpd (3 cpd: r =  − 0.432, p< 0.03; 6 cpd: r =  − 0.629, p< 0.0005; 12 cpd: r =  − 0.535, p< 0.005; and 18 cpd: r =  − 0.58, p< 0.001), whereas no significant correlations were found in the control group. Visual acuity was significantly correlated to CS at 6, 12, and 18 cpd in NTG patients (r =  − 0.68, p< 0.002; r =  − 0.54, p< .02, and r =  − 0.88, p< 0.0001 respectively), however not in healthy control patients. Age, visual field defect MD, and PSD were not significantly correlated to CS in in the NTG group. MD and PSD were significantly correlated to CS at 3 cpd in healthy eyes (r = 0.55, p< 0.02; r =  − 0.47, p< 0.03). Conclusion Retinal blood flow alterations show a relationship with contrast sensitivity loss in NTG patients. This might reflect a disease-related link between retinal blood flow and visual function. This association was not recorded in healthy volunteers.

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