• Many forms of acquired nystagmus may also be caused by disruptions of visual fixation, the vestibulo-ocular reflex and the mechanism that makes it possible to hold the gaze at eccentric eye positions. (medscape.com)
  • Three mechanisms are involved in maintaining foveal centration of an object of interest: fixation, the vestibulo-ocular reflex, and the neural integrator (which allows for gaze holding in extreme, or eccentric, eye positions). (medscape.com)
  • The vestibulo-ocular reflex is a complex system of neural interconnections that maintains foveation of an object during changes in head position. (medscape.com)
  • A disorder affecting any of the three components involved in maintaining the steady positioning of the eyes (ie, visual fixation, the vestibulo-ocular reflex or the neural integrator) may result in nystagmus. (medscape.com)
  • After obtaining and reviewing medical records of 21 personnel who consented to the study, the researchers conducted clinical tests of vestibular (dynamic and static balance, vestibulo-ocular reflex testing, caloric testing), oculomotor (measurement of convergence, saccadic, and smooth pursuit eye movements), cognitive (comprehensive neuropsychological battery), and audiometric (pure tone and speech audiometry) functioning. (lww.com)
  • She was visually asymptomatic, with normal fundus appearance, normal colour vision testing findings, 20/20 visual acuity in both eyes, and only mild central bilateral defects on 10-2 perimetry. (repositoriosalud.es)
  • The acuity of central vision (at the optic disc) was explained by the concentration of visual spirit where the optic nerve met the retina. (nature.com)
  • Foveal centration of an object is necessary to obtain the highest level of visual acuity. (medscape.com)
  • Fixation in the primary position involves the visual system's ability to detect drift of a foveating image and signal an appropriate corrective eye movement to refoveate the image of regard (ie, move the image to the central 1-2º of the visual field where visual acuity is highest). (medscape.com)
  • IOP, best-corrected visual acuity, and visual field parameters were considered. (arvojournals.org)
  • No statistically significant vital signs, visual field, visual acuity changes, or adverse events were detected in either group. (arvojournals.org)
  • Alcohol ingestion also failed to alter either visual acuity or contrast sensitivity, as assessed under both photopic and mesopic conditions. (lvhn.org)
  • 5) This subjective evidence consisted of improved or stabilized visual acuity, improved or stabilized visual fields, and improved night vision. (health-matrix.net)
  • Greek and Roman humoral physiology needed a hollow optic nerve, the obstruction of which prevented the flow of visual spirit to and from the brain and resulted in blindness. (nature.com)
  • These programs focus on the scientific study of vision, visual processes, and related phenomena and clinical research and treatment modalities. (novascotia.ca)
  • Disruption in any of these components will predictably lead to an inability to maintain visual fixation. (medscape.com)
  • [ 1 ] Nystagmus typically includes two movements: a slow first movement of the eye away from the visual target followed by a second, corrective movement that brings the eye back to the visual target. (medscape.com)
  • Medieval physicians understood that the presence of a fixed dilated pupil indicated optic nerve obstruction, preventing the passage of visual spirit, and that cataract surgery in such cases would not restore sight. (nature.com)
  • Some believed that the contractive power of the pupil was sufficient to account for the phenomenon, until the fact was established, by the operation for the removal of the iris, that the eye accommodated perfectly without this part of the visual mechanism. (iblindness.org)
  • in their 2010 article in Optics Express credit Pavlidis as the "first who postulated the idea of performing physiological measurements on the face, which later demonstrated through analysis of facial thermal videos. (wikipedia.org)
  • Like Donders, he found the image obtained by the ordinary methods on the front of the lens very unsatisfactory, and in his "Handbook of Physiological Optics" he describes it as being "usually so blurred that the form of the flame cannot be definitely distinguished. (iblindness.org)
  • Pavlidis went on to develop several contactless thermo-physiological measurement methods that found applications in emotion and wellness monitoring. (wikipedia.org)
  • Such obtrusive measurement methods were rendering continuous physiological monitoring impractical and were undercutting the aim of affective computing to understand human emotions. (wikipedia.org)
  • To address these issues, Pavlidis designed contactless physiological measurement methods, which he operationalized by replacing sensors with thermal imaging trackers, and electronic devices with thermo-physiological models. (wikipedia.org)
  • Researchers believe that the measurement of visual, vascular and central nervous system changes over the course of this experiment and during the subsequent post-flight recovery will assist in the development of countermeasures, clinical monitoring strategies, and clinical practice guidelines. (nasa.gov)
  • Congenital nystagmus (CN), also called infantile nystagmus, may be associated with afferent visual pathway abnormalities (sensory nystagmus) or with albinism, optic nerve hypoplasia or congenital cataracts. (medscape.com)
  • What no one disputes is that, beginning in late 2016 and continuing until August 2017, a total of 24 US diplomatic personnel stationed in Havana, Cuba, experienced audible or sensory phenomena emanating from a distinct direction. (lww.com)
  • 2009. "Acquired auditory-visual synesthesia: A window to early cross-modal sensory interactions. (umk.pl)
  • 2001. "Visual touch in virtual environments: An exploratory study of presence, multimodal interfaces and cross-modal sensory illusions. (umk.pl)
  • The information from both stations will be compared and analyzed, and grant researchers unique insights, helping them find possible explanations for electrical phenomena in the atmosphere. (calcalistech.com)
  • Whereas IOP is the main driver of progressive visual loss in most patients with POAG, NTG likely represents a heterogeneous or multifactorial group of etiologies, with a common final pathway of retinal ganglion cell loss. (nih.gov)
  • Continuation of visual impression after cessation of stimuli causing the original image. (childrensmercy.org)
  • There is partial and variable disconnection from the outside world at the time of apparitional experience, and sensations travel in a normal manner to the brain of the Medjugorje seers, but the findings of evoked auditory potential tests and screening tests show that the cerebral cortex does not perceive the transmission of the auditory and visual neuronal stimuli received from the immediate environment. (medjugorje.com)
  • For instance, during the COVID-19 pandemic, Boston Dynamics released the Dr. Spot canine robot, equipped with thermal and visual cameras for contact-free physiological measurements in clinical settings. (wikipedia.org)
  • Clinical interpretation of EEG recordings is most often performed by visual inspection of the tracing or quantitative EEG analysis . (explained.today)
  • Nystagmus is defined as the involuntary, periodic rhythmic ocular oscillation of the eyes that can either be physiologic (may not affect vision) or pathologic. (medscape.com)
  • One year crewmembers Kelly and Kornienko completed vision and tonometry tests and took blood pressure measurements as part of their Flight Day 270 Ocular Health testing. (nasa.gov)
  • I also conduct research of vision and visual perception and am the author of the textbook "Basic Vision" (OUP). (cardiff.ac.uk)
  • This is a second report on preliminary work with dimethyl sulfoxide (DMSO) in the treatment of certain ocular diseases. (health-matrix.net)
  • Derivatives of the EEG technique include evoked potential s (EP), which involves averaging the EEG activity time-locked to the presentation of a stimulus of some sort (visual, somatosensory , or auditory). (explained.today)
  • Mixing can be done in the dimension of time (by retaining a precisely chosen thought during the presence of the phosphene), or in both dimensions of time and space (by locating the visual or auditory mind image within the phosphene). (neeeeext.com)
  • The growth of anatomy and influence of mechanical philosophy from the 17th century led to visual spirit being replaced with the concept of nerve force, which later became associated with electricity travelling along nerve fibres. (nature.com)
  • To this aim, through electrophysiology in cats, we explored that visual neurons, throughout the cortical column, have a tendency to alter their inherent properties even when presented a non-visual stimulus. (intechopen.com)
  • Moreover, some methods of visual physiotherapy, like the Bates method, use light to re-educate the eyes. (neeeeext.com)
  • Multiple attempts to quantify pain objectively using single measures of physiological body responses have been performed in the past, but the variability across participants reduces the usefulness of such methods. (bvsalud.org)
  • In research between 2000 and 2012, Pavlidis developed contactless physiological measurements, impacting affective computing and personal health informatics. (wikipedia.org)
  • Pavlidis first articulated his ideas for contactless, continuous, and automated physiological measurements in the paper `Continuous physiological monitoring', which appeared in the 2003 IEEE Engineering in Medicine and Biology Society (EMBS) conference proceedings. (wikipedia.org)
  • There are both normal and altered physiological parameters. (medjugorje.com)
  • The study will examine the structure and behavior of lightning elves, and other atmospheric electrical-discharge phenomena, and is a follow-up experiment to fallen first Israeli Ilan Ramon's Meidex experiment on his STS-107 mission aboard the Columbia shuttle. (calcalistech.com)
  • Different sensors measured physiological responses. (bvsalud.org)
  • Gamma rays are a common phenomenon that occur in space, and are intense energetic explosions that have been observed in distant galaxies. (calcalistech.com)
  • CN can also occur without central or ocular nervous system abnormalities (idiopathic CN). (medscape.com)
  • Also, they can perform the Brückner or red reflex and supplement the information with visual evoked potentials. (youaremom.com)
  • After 6 months, the physiological strabismus tends to disappear, and in addition to the red reflex, experts recommend evaluating the child's ability to fixate on an object . (youaremom.com)
  • The visual sensations in near-death experiences have been associated with disturbances in brain function, as well as religious and supernatural forces. (iands.org)
  • We propose that these phenomena may be explained by the different tissue pressures in the eye and brain, which influence the consequences of reduced arterial blood pressure. (iands.org)
  • The increase of public awareness on ocular conditions leads to an early diagnosis and treatment, as well as an increased demand for more effective and minimally invasive solutions for the treatment of both the anterior and posterior segments of the eye. (mdpi.com)
  • Monitoring and treatment can reduce the risk of visual morbidity in most patients. (nih.gov)
  • This phenomenon occurred within the first month of the initial DMSO treatment, after some early improvement had been noted by these patients. (health-matrix.net)
  • Finally, any injury to an ocular structure can favor this situation, as it could function as a compensatory mechanism and not as a primary defect. (youaremom.com)
  • Glaucoma is characteristic progressive optic neuropathy, featuring optic disc cupping and visual field loss, associated with raised intraocular pressure (IOP). (nih.gov)
  • Despite being the most common route of ophthalmic drug administration, eye drops are associated with compliance issues, drug wastage by lacrimation, and low bioavailability due to the ocular barriers. (mdpi.com)
  • This is something common and physiological during the first months of life, due to the immaturity of the eye muscles. (youaremom.com)
  • The Ocular Health protocol calls for a systematic gathering of physiological data to characterize the risks of microgravity-induced visual impairment and increased intracranial pressure in ISS crewmembers. (nasa.gov)
  • This finding linked errant human communication with unnecessary ocular activation - a bio-evolutionary remnant of `fight or flight' responses in physical danger. (wikipedia.org)
  • Upper-atmospheric lightning, occasionally referred to as "lightning elves" is a form of electrical-breakdown phenomena that occurs well above the altitudes of normal lightning and storm clouds. (calcalistech.com)
  • Since then, contactless physiological monitoring has been finding an increasing number of applications in personal health informatics. (wikipedia.org)
  • Furthermore, it was explored in mice, how the application of drugs (serotonin and ketamine) modulates potential plasticity within the visual system. (intechopen.com)
  • The researchers suggest that 'temporal disintegration', seen at higher doses, can account for this phenomenon and may play a significant underlying role in a number of other cannabis effects, including depersonalization, a sense of timelessness, and perhaps acute psychotic or panic reactions. (druglibrary.net)
  • This phenomenon is known as amblyopia and is the significant (and sometimes irreversible) loss of visual ability. (youaremom.com)
  • Conclusion Retinal embolic events and new retinal abnormalities following TAVI occurred in 15% and 20% of our cohort, respectively, without any associated retinal damage or significant visual problems. (bmj.com)
  • An impaired visual field leading to loss of a driving license can have a major impact on quality of life. (nih.gov)
  • The voice phenomenon observed at the time of the Medjugorje apparitional experience is reported in other sites of Marian apparition and not in any other religious or paranormal phenomenon. (medjugorje.com)
  • Adverse effects and costs of medical and surgical treatments should be weighed against the risk of visual loss. (nih.gov)
  • An ocular physiological explanation for visual sensations in near-death experiences Journal of Near-Death Studies , 25(2) 109-120. (iands.org)