Impact of luminance distribution in the visual field on foveal contrast sensitivity in the context of mammographic softcopy reading

2009 ◽  
Author(s):  
Dörte Apelt ◽  
Richard Rascher-Friesenhausen ◽  
Jan Klein ◽  
Hans Strasburger ◽  
Bernhard Preim ◽  
...  
Keyword(s):  
Visual Field ◽  
Contrast Sensitivity ◽  
Luminance Distribution

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.

scholarly journals Association of Vistech contrast sensitivity and visual field findings in glaucoma.

1991 ◽  
Vol 75 (9) ◽  
pp. 558-560 ◽  
Author(s):  
W E Sponsel ◽  
K L DePaul ◽  
J F Martone ◽  
M B Shields ◽  
A R Ollie ◽  
...  
Keyword(s):  
Visual Field ◽  
Contrast Sensitivity

scholarly journals Stimulus-dependent contrast sensitivity asymmetries around the visual field

2020 ◽  
Vol 20 (9) ◽  
pp. 18
Author(s):  
Marc M. Himmelberg ◽  
Jonathan Winawer ◽  
Marisa Carrasco
Keyword(s):  
Visual Field ◽  
Contrast Sensitivity

Contrast Sensitivity and Visual-Field Thresholds in Patients with Thyroid Optic Neuropathy

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 194-194
Author(s):  
J Jankauskiene ◽  
R Lukauskiene ◽  
B Mickiene
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Contrast Sensitivity ◽  
Optic Neuropathy ◽  
Control Group ◽  
Ophthalmological Examination ◽  
Threshold Test ◽  
Spatial Frequencies ◽  
Snellen Visual Acuity ◽  
The Mean

Thyroid optic neuropathy is one of the most troubling complications of endocrine ophthalmopathies. It is related to the degree of extraocular muscle swelling in the apex of the orbit. The purpose of this study was to investigate contrast sensitivity and visual-field thresholds in patients with thyroid optic neuropathy. We examined twenty-two patients aged 29 – 63 years (mean 45.3 years). The control group consisted of fifteen healthy persons of similar age. Contrast sensitivity was measured by means of Volkov's charts (sinusoidal gratings) at eight spatial frequencies from 17.5 to 0.46 cycles deg−1. The visual field was investigated with a static automatic perimeter (Allgan Humphrey Field Analyzer) by means of the central 30-2 threshold test. All patients underwent a complete ophthalmological examination including best corrected Snellen visual acuity, fundus copy, and proptosis measurement with the Hertel exophthalmometer. The mean proptosis of patients was 19.4 mm. Fifteen of the patients had decreased visual acuity. Contrast sensitivity at low spatial frequencies was significantly reduced in the patients. It was established that a reduction of visual-field threshold accompanies the decrease of visual acuity. Our results show that contrast sensitivity and visual-field threshold testing are very sensitive at detecting early optic neuropathy and may be a useful means of following patients after treatment.

scholarly journals Contrast sensitivity isocontours of the central visual field

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Agnes Y. J. Choi ◽  
Lisa Nivison-Smith ◽  
Jack Phu ◽  
Barbara Zangerl ◽  
Sieu K. Khuu ◽  
...  
Keyword(s):  
Visual Field ◽  
Contrast Sensitivity ◽  
Central Visual Field

Importance of escape route resign based on luminance distribution of evacuee’s visual field

2021 ◽  
Author(s):  
Yuki Akizuki ◽  
Masashi Niwa ◽  
Yuji Hori ◽  
Hideki Yamaguchi
Keyword(s):  
Visual Field ◽  
Escape Route ◽  
Luminance Distribution
Sign in / Sign up

Export Citation Format

Share Document