With the help of the EFA, optical coherence tomography, Goldmann perimetry and a Humphrey field analyser, these natural and acquired scotomas were diagnosed and the results were compared accordingly. (bmj.com)
Purpose: (i) To determine the effects of various characteristics of moving stimuli on the area of the blind spot using semi-automated kinetic perimetry (SKP) and (ii) to evaluate the repeatability of this method. (uni-tuebingen.de)
We developed software to make the retinal placement of stimuli during micro-perimetry by a scanning laser ophthalmoscope (SLO) independent of involuntary fixational eye movements. (ski.org)
Artificial scotomas2
To investigate the effect of an artificial scotoma on open-loop disparity vergence responses (DVRs) and vergence control mechanisms, we examined open-loop DVRs to disparity stimuli using monocular artificial scotomas in normal subjects. (amplifyeye.care)
A study based on artificial scotomas and gaze-contingent paradigm. (ls2n.fr)
Glaucoma3
Results from patients suffering from cortical lesions and glaucoma further indicate that the EFA is capable of diagnosing acquired scotoma validly and is applicable for clinical use. (bmj.com)
This led to the hypothesis that the orientation of the MDT stimulus could have a significant effect on motion threshold glaucoma, and that stimulus orientation might be incorporated in order to improve the sensitivity of the test. (ucl.ac.uk)
This hypothesis was tested in chapter 8, which identified increasing elevation of motion threshold for a line stimulus moving perpendicular to the retinal nerve fibre layer compared to a line stimulus moving parallel to the retinal nerve fibre layer in some glaucoma patients. (ucl.ac.uk)
Retinal2
Therefore, scotomata may be simulated in visual fields which are purely optically evoked (so-called refraction scotomata ), because the light stimulus is mapped on an enlarged/reduced retinal area, thereby reducing/increasing light density. (wfbabcom5.com)
En face OCT reflectance images which accompany OCTA studies offer a glimpse of the macrophage-like cellular activity above the retinal surface which responds to systemically instigated vascular events below. (stanford.edu)
Paracentral5
She underwent Humphrey visual field testing, as an inpatient, which showed a full field in the right eye and a small paracentral scotoma in the left. (aao.org)
After considering her normal visual field in the right eye, paracentral scotoma in the left eye, and lack of a relative afferent pupillary defect, we believed a maculopathy was more likely. (aao.org)
Acute macular neuroretinopathy (AMN) was first described by Drs. Bos and Deutman after a series of 4 women presented with acute decline in vision and were found to have paracentral scotomata corresponding to wedge-shaped lesions of the macula. (aao.org)
Regardless of etiology, the final common disease process includes monocular paracentral scotomata that correspond to discrete petalloid or wedge-shaped lesions near the fovea. (aao.org)
With both forms of AMD, there can be a reduction in best-corrected visual acuity (BCVA), loss of contrast sensitivity, development of central and paracentral scotomas, decrease in stereopsis and delay in dark adaptation. (reviewofoptometry.com)
Monocular1
Second, monocular responses from each eye were symmetrical although the stimuli to each eye were asymmetrical. (amplifyeye.care)
Visual field defects1
Conclusion Outcomes indicate that the EFA is highly reliable and precise in diagnosing individual shape and location of scotoma and capable of recording changes of visual field defects (after intervention) with unprecedented precision. (bmj.com)
Responses2
The calcarine cortical BOLD responses were abnormally elicited by stimulation of the ipsilateral visual field and in the scotoma region, demonstrating a profound neuronal reorganization. (pisavisionlab.org)
Responses of neurons in lateral intraparietal area depend on stimulus-associated reward during binocular flash suppression. (mpg.de)
Distortion2
Spatial aspects of the interactions are explored using the distortion effect of the scotoma depending on the visual pattern, which can be luminance-defined or illusory. (caltech.edu)
Otherwise, a distortion of the stimulus grid, as well as a (area enlarging/reducing) distortion of the stimuli themselves, can occur. (wfbabcom5.com)
Peripheral1
Such instruments may assess the central and peripheral visual field and typically the areas of vision (scotomas) missing or depressed. (zionmarketresearch.com)
Vision6
Ophthalmic instruments designed to measure and assess the region (visual field) in which stimuli projected on a curved surface can create the illusion of vision in a straight-ahead position with the ears. (zionmarketresearch.com)
Patients with spots of diminished or no vision (scotomas) often do not realize the nature of their deficit. (ski.org)
These visual abnormalities are characterised by the appearance of scotomas or visual gaps in the central field of vision, resulting in a significant impairment of visual perception. (akupunktur-noll.de)
The hardening is generally the result of an increase in connective tissue with subsequent calcification (hardening) Sclerotic Hardened Scotoma Area of varying size and shape within the visual field in which vision is absent or impaired. (mpdoctors.com)
Scotomas (areas of no vision) caused by other alterations in the retina or optic paths. (icrcat.com)
Other associated features include reduced visual acuity (VA), impaired or absent colour vision (in all three axes) and central scotoma. (gene.vision)
Occur1
When it becomes impossible to attend to all the stimuli in a given situation, a temporary 'blindness' effect can occur, as individuals fail to see unexpected but often salient objects or stimuli. (janettesmith.com)
Orientation1
Results show clear evidence of residual unconscious processing of position, orientation and motion of visual stimuli displayed in the scotoma of congenitally lesioned children, but not in the children with acquired lesions. (pisavisionlab.org)
Detect2
Field of view is the space in which our visual system can detect the presence of stimuli . (cognifit.com)
However, some patients, when forced to do so, can detect, localize, and discriminate stimuli briefly presented in their impaired visual field despite denying being able to see. (web.app)
Patients4
An afferent pupillary defect is present in 75% of patients, along with enlarging visual field scotomas. (medscape.com)
Hemianopia patients present difficulties in detecting stimuli in the defective visual field and show defective scanning and exploration ( 6 ). (frontiersin.org)
This technique can help patients to heighten their awareness of scotomas. (ski.org)
Other of his important accomplishments include the use of X-rays for diagnosing brain tumors, when it comes to studying the human sensory cortex he was the first to use electrical stimuli, and he had a great effect on the survival rates of patients that had surgeries for intracranial tumors. (thefrisky.com)
Effect1
Recently, M. Boi, H. Ogmen, J. Krummenacher, T. U. Otto, & M. H. Herzog (2009) reported a fascinating visual effect, where the direction of apparent motion was disambiguated by cues along the path of apparent motion, the Ternus-Pikler group motion, even though no actual movement occurs in this stimulus. (pisavisionlab.org)
Area1
Nonlinear population receptive field changes in human area V5/MT + of healthy subjects with simulated visual field scotomas. (mpg.de)
Subjects1
Furthermore, when the stimuli were auditory tones rather than flashes, all subjects responded veridically. (pisavisionlab.org)
Features1
Temporal interactions are demonstrated in the filling-in of the scotoma with temporally adjacent visual features, as well as in the effective suppression of transient visual features. (caltech.edu)
Results2
Results of the use of alternating stimulus presentation in orthooptic treatment in children. (ssmj.ru)
We adapted the test to one with simple grating stimuli that could be more readily modeled and replicated their psychophysical results quantitatively with this stimulus. (pisavisionlab.org)
Blind spot1
See also blind spot (scotoma), or a root + -icalis of, relating to, or resembling] pathological fire-setting n. (riversideortho.com)
Black1
The scotomas were black circles located in the center of a random dot pattern for the left eye. (amplifyeye.care)
Response2
Mitochondria are highly dynamic, complex organelles that continuously alter their shape, ranging between two opposite processes, fission and fusion, in response to several stimuli and the metabolic demands of the cell. (centrodinoferrari.com)
The difference between accommodative stimulus and accommodative response, measured in diopters. (eyepatient.net)
Size1
We first found that the amplitudes of DVRs were gradually decreased and the latency of DVRs was moderately increased as the size of the scotomas was increased. (amplifyeye.care)
Great1
Here's a great interactive example of how scotomas work. (janettesmith.com)
Study1
Study of depth bias of observers in free viewing of still stereoscopic synthetic stimuli. (ls2n.fr)
Time1
Occurs when visual cortex perceives separate stimuli from the two eyes at the same time and concerns itself essentially with the absence of suppression. (optography.org)
Create1
We first introduce a method to create a hole, or a scotoma, in a flashed, large-field visual pattern using single-pulse TMS. (caltech.edu)