2 edition of effect of subjective distance cues on the accommodative and vergence states of the human eye found in the catalog.
effect of subjective distance cues on the accommodative and vergence states of the human eye
Patricia Ann Kondrick
Written in English
|Statement||by Patricia Ann Kondrick.|
|The Physical Object|
|Pagination||viii, 38 leaves, bound :|
|Number of Pages||38|
Abstract Vergence eye movements are a key factor in stereoscopic depth perception. In this brief review I will outline work at York University on select aspects of the relation between vergence and stereopsis, sensory fusion and depth constancy. Key words Vergence, depth perception, distance perception, eye movements, depth constancy, fusion 1. Effects of age on the judged distance to virtual objects in the near visual field. In W. A. Rogers (Ed.), Designing for an aging population: Ten years of human factors/ergonomics research (pp. 15 – 19). Santa Monica, CA: Human Factors and Ergonomics Society. Google ScholarCited by: Immersive virtual reality and augmented reality (VR/AR) systems are entering the consumer market and have the potential to profoundly impact society. Applications of these systems range from communication, entertainment, education, collaborative work, simulation, and training to telesurgery, phobia. 6th International Wavefront Congress, Athens The effect of ocular higher-order aberrations on accommodative response Sotiris Plainis, MSc, PhD Harilaos Ginis, PhD Aris Pallikaris, MSc Institute of Vision & Optics, UNIVERSITY OF CRETE.
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An effect of disparity amplitudes was observed (). Vergence latency decreases with increasing disparity amplitude. Lastly, an interaction effect between vergence direction and disparity amplitudes was found (). The effect of disparity amplitudes on latency was larger for divergence than for by: The Effect of Knowledge of Object Distance on Accommodation during Instrument Viewing John C Kotulak, Stephen E Morse, and Roger W Wiley Perception 6, Cited by: All measurements were taken on the subject’s right eye with the left eye occluded while the subject wore their habitual refractive correction, if they had one.
Subjects were instructed to view a high-contrast letter chart positioned at 11 meters and five repeated distance measurements were by: Accommodative vergence is driven by blur to change the shape of the lens in the eye.
We are studying the interaction between the disparity and accommodative vergence systems. This will lead to further insight of how the two systems interact.
This information can be used to help people with accommodative and disparity by: 1. Results show significant difference in the open loop accommodative response at the two distances under both open and closed loop conditions of vergence.
Results obtained were. in an accommodative vergence task and did not observe movement in the eye. Pickwell (), using photographic and direct visual observation methods, did not observe movement in the viewing eye during accommodative vergence. The remainder of the con- temporary studies on accommodative vergence.
Article 4 The Effect of Orthokeratology on Accommodative and Convergence Function: A Clinic Based Pilot Study Paul Brand, BAppSc(Optom), GradCertOcTher, Caboolture, Queensland ABSTRACT Background: Orthokeratology is a successful treatment for patients with myopia.
There has been little research on its effects on accommodation and convergence. symptoms related to accommodative or vergence dysfunction.
Symptoms commonly associated with accommodative and vergence anomalies include blurred vision, headache, ocular discomfort, ocular or systemic fatigue, diplopia, motion sickness, and loss of concentration during a task performance.
The prevalence of accommodative and vergence disorders,File Size: KB. The autorefractor was aligned with the right eye, as well as with both accommodative stimuli.
The fellow left eye was fully occluded with a black eye patch. When instructed, the subject changed focus as rapidly as possible between the two stimuli. There were approximately changes in focus between the accommodative stimuli during the test. Spatial Vision, Vol.
15, No. 1, pp. 77– 97 () ÓVSP The role of vergence in the perception of distance: a fair test of Bishop Berkeley’ s claim ALEXANDERD. LOGVINENKO1 ;¤, JULIE EPELBOIM 2† and ROBERT M. STEINMAN3 1School of Psychology, Queen’ s University, Belfast, BT9 5BP, UK 2Center for the Study of Language and Information, Stanford University, Stanford, CA.
The relative importance of retinal blur and disparity, the primary sensory cues to accommodation and vergence, is largely unknown during development; a period when growth of the eye and head necessitate continual recalibration of egocentric space.
The random step stimulus is represented with a black rectangle with the three possible latencies (, 1 and s). The right figure (B) plots the accommodative demand as a function of vergence demand for the possible step stimuli in the conflict condition (white squares) and the match condition (white circles).
This action is mediated by the medial rectus muscle, which is innervated by Cranial nerve III. It is a type of vergence eye movement. Near point of Convergence (NPC) is measured by bringing an object to the nose and observing when the patient sees double, or.
Horwood Accom & vergence in esotropia Version 1 3 still responded to disparity cues. The accommodative esotropes made less use of disparity cues to drive accommodation (p=) and more use of blur to drive vergence (p=) than expected, all esotropic groups did not show the strong bias for better.
Introduction. Accommodation facility is a measure of the speed of the accommodative step response and is tested subjectively in the clinic by having patients perform a flipper test in which plus and minus lenses (usually ± or ± diopters) are alternated before one or both eyes as the patient views either a far (e.g.
6 m) or near (e.g. 40 cm) by: such as target misalignment and proximal cues such as size, fusional vergence and near effort9. The purpose of this preliminary pilot study was to investigate the effects of different sized pinholes on proximal VA at m while various factors were altered.
The alterations involved accommodation and illumination. The accommodative response was in-File Size: 1MB. nonstrabismic accommodative and vergence disorders There are a wide range of symptoms reported in patients who manifest nonstrabismic accom-modative and vergence disorders.
26 With respect to accommodation, these include: blurred vision at distance and/or near during or immediately fol-lowing nearwork, headaches, poor concentration.
ACCOMMODATIONRESPONSES OFEYE eye. Both beams are adjusted carefully to appear exactly in line when viewed by the subject throughlens L4placed onthe subject's side ofthe beamsplitter. ThepowerF(in dioptres) andtheposition ofthis lens areso chosenthatitssecondfocal planeis inthenodalpointofthesubject'seye.
Underthiscondition,ifxisthedisplacement ofthe target from the first Cited by: Short-term adaptation of accommodation, accommodative vergence Accommodative–vergence Blur Eye movements Human abstract absence of other cues for distance and we always afforded them a few (10–20) steps in accommodation to familiarize them with the eye tracker.
Subjects were occasionally given feedback as to how. Distance refractive states and near point of accommodation were measured for all subjects. Two subjects were excluded for poor accommodation to a stationary target during the optometer calibration procedure (described below). One subject was excluded for accommodative spasm (severe over-accommodation) and three for excessive blinking during trials.
objective proximal stimulated) on subjects aged 3 to 64 years using a mm letter. Subjective push-up amplitudes were the dioptric distance at which the target first blurred along a near-point rod.
Objective minus lens stimulated amplitudes were the greatest accommodative response obtained by Grand Seiko autorefraction as subjects viewed the stimulus at 33 cm through increasing minus.
Patricia Ann Kondrick has written: 'The effect of subjective distance cues on the accommodative and vergence states of the human eye' -- subject(s): Adjustment (Psychology), Eye.
itching eyes, dry eye sensation, blurred or double vision. It frequently appears in association with activities requiring near viewing such as reading and writing whereby eye accommodative and vergence processes are more intense . An overstraining during near activities and/or a temporary.
Patricia Ann Kondrick has written: 'The effect of subjective distance cues on the accommodative and vergence states of the human eye' -- subject(s): Adjustment (Psychology), Eye, Accommodation. Vision Research 39 () – The depth-of-ﬁeld of the human eye from objective and subjective measurements Susana Marcos a,*, Esther Moreno b, Rafael Navarro b a Schepens Eye Research Institute, 20Staniford Street, Boston MA, USA b Instituto de O´ ptica Daza de Valde´s, Consejo Superior de In6estigaciones Cientı´ﬁcas, SerranoMadridSpain.
Journal of Medical and Biological Engineering, 30(1): 1 Review: Behaviors, Models, and Clinical Applications of Vergence Eye Movements Yung-Fu Chen 1 You-Yun Lee 2 Tainsong Chen 2 John L. Semmlow 3 Tara L.
Alvarez 4,* 1Department of Health Services Administration, China Medical University, TaichungTaiwan, ROC 2Institute of Biomedical Engineering, National Cheng Kung University.
A subject who can easily see the disparity boundary between 0 and 20 arcsec might well be completely blind to the difference between and arcsec. 38 This effect probably explains why Cited by: The display screen is at the same distance as the simulated far object so the vergence and focal distance of the image of the far object are the same as in a.
However, the near object is presented on the display screen so its focal distance is no longer equal to the vergence distance, resulting in vergence-accommodation conflict and incorrect blur. In optometry of binocular vision, the question may arise whether prisms should be included in eyeglasses to compensate an oculomotor and/or sensory imbalance between the two eyes.
The corresponding measures of objective and subjective fixation disparity may be reduced by the prisms, or the adaptability of the binocular vergence system may diminish effects of the prisms over time. This study. Vergence and accommodative responses in viewing near objects in the real world are behaviorally coupled to maintain clarity and singularity for the object of regard.
However virtual stereoscopic stimuli, such as in 3D displays, create non-normal coupling that may cause improper vergence and accommodative responses, possibly resulting in visual Cited by: Abstract — Vergence dysfunction in individuals with mild traumatic brain injury (mTBI) may have a negative effect on quality of life, functional abilities, and rehabilitative this study, we used a range of dynamic and static objective and subjective measures of vergence to assess 21 adult patients with mTBI and nearwork symptoms.
Proximal Vergence-Perceptual distance cues for gaze shifts Dynamic gaze-shifting response (analogous to a saccade) Proximal vergence is a voluntary gaze shift from one target distance to another in response to perceived distance. Horizontal proximal vergence is under voluntary control.
Vertical and cyclo-vergence are not controlled voluntarily. To prove accommodative/vergence therapy (AT) can normalize the accommodative function of myopic children.。 If the accommodation function of myopic children can be improved with AT therapy, the outcome will supply a basic for a randomized, multi-center clinic trail to determine the effectiveness of AT to slow the progression of myopia.
Abstract — A range of dynamic and static vergence responses were evaluated in 12 individuals with mild traumatic brain injury (age: 29 +/– 3 yr) having near vision measures were performed in a crossover design before and after oculomotor training (OMT) and placebo (P) training.
Following OMT, peak velocity for both convergence and divergence increased significantly. Haploscope measurements of accommodation and accommodative vergence over a range of stimuli to accommodation were carried out on six young adult observers at various levels of alcoholic intoxication.
In all cases there was a decrease in response AC/A proportional to the level of blood ethanol. A Cited by: Proximal vergence: vergence due to the awareness of a fixation object being near or far in the absence of disparity and of cues for accommodation.
This includes also vergence that is due to a subject's intent to fixate an object in the dark. Vergence dysfunction in mild traumatic brain injury (mTBI): a review. Ophthalmic Physiol Opt31, – doi: /j‐x Abstract. Vergence eye movements are used to track objects that move in depth in one’s binocular visual Cited by: Used to predict how tonic, accommodative, and fusional vergence results in the final eye position.
Graphical Analysis. Visually represents the ranges of stimulus values through which a patient will have comfortable binocular vision. Study 45 Chapter 8 Accommodative Facility and Vergence Facility flashcards from Stuart Y. on StudyBlue.
Accommodative Convergence lessens so positive fusional vergence kicks in to make up the difference How does abnormal vergence and phoria findings affect vergence facility. latencies were longer. Vergence flipper tests are done with.
Accommodative vergence: blur-driven vergence. Fusional vergence (also: disparity vergence, disparity-driven vergence, or reflex vergence ): vergence induced by a stimulus to binocular fusion. Proximal vergence: vergence due to the awareness of a fixation object being near or far in the absence of disparity and of cues for accommodation.
This. Ocular Motility Final. STUDY. PLAY. -cue to disjunctive eye movements-disparity between location of imgs on the two retinas, produces diplopia which leads to fusional vergence -accommodative vergence may be studied indep of the effects of retinal disparity by covering one eye.Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red-blue or red-green colors, but can also be perceived with red-grey or blue-grey images.
Such illusions have been reported for over a century and have generally been attributed to some form of chromatic aberration.
Chromatic aberration results from the differential.Earlier studies have reported temporal rotation of Listing’s plane with convergence of the eyes causing torsion, which is dependent on eye elevation.
The amount by which the planes rotate differs from study to study. To gain insight into the functional significance of the temporal tilt of Listing’s plane for vision, we examined whether the rotation of the plane depends on the visual.