Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “DEPTH PERCEPTION”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 127 records · Page 7Linked to original sources
PubMed2003

A case of acute loss of binocular vision and stereoscopic depth perception. (The misery of acute monovision, having been binocular for 68 years).

PURPOSE: There are few personal reports in the literature, by knowledgeable vision scientists, of the loss of binocular vision. This case is reported. CASE REPORT: This 68 year old retired pediatric ophthalmologist suffered an almost total loss of vision, OD, as a result of a sudden massive hemorrhage into the vitreous body from a bridging retinal vessel, which remained after repair of a spontaneous large horseshoe retinal tear. This caused significant problems with both remaining monocular vision, cognition, and space perception. It was surprisingly disabling. A diary is included. RESULT: The author now appreciates better: 1. that the overlap and cross compensation of monocular vision is quite significant; 2. that monocular depth perception may be impaired by any type of intervening optical media; 3. that a two dimensional world is very different and vastly inferior to a three dimensional world. COMMENT: Such problems are not ordinarily expected or described in these circumstances, but considering what is in the literature, they may be more common and serious than assumed by eye care professionals, and should be taken into consideration in rendering eye care in similar situations. Loss of binocular vision results in a significant handicap even when the vision remaining in the good dominant eye is normal. It is truly remarkable to this victim that so many mature patients are willing to accept this situation in the form of surgical or optical monovision to avoid spectacles for presbyopia.

Acute Disease↗
PubMed2003

Further followup: (Part IV) A case of acute loss of binocular vision and stereoscopic depth perception.

(Combined case report followup) This is a continuation of a personal report by a knowledgeable vision scientist, of the loss of binocular vision due to a major vitreous hemorrhage. Please see the initial report for further details. (Romano PE. A case of acute loss of binocular vision and stereoscopic depth perception. (The misery of acute monovision, having been binocular for 68 years) Binocul Vis Strabismus Q 2003; 18:51-55; and followup Binocul Vis Strabismus Q 2003; 18:101-103, Binocul Vis Strabismus Q 2003; 18:174-175. This report covers months nine and ten following the hemorrhage. In the two months since the last report, Visual acuity continues to improve to 20/20 with correction, one line less than the fellow eye. Residual ring shaped floaters only occasionally interfere with visual function which is normal now for virtually all extents and purposes. The previously reported observation that binocular ocular sighting dominance is gaze dependent is confirmed by prior recently published research: Khan AZ, Crawford JD. Ocular dominance reverses as a function of horizontal gaze angle. Vision Research 2001; 41:1743-1748.

Acute Disease↗
PubMed1994

Depth perception in salamanders: the wiring of visual maps.

Most members of the salamander family Plethodontidae exhibit fast and precise prey localization and are likely to use stereopsis for this task. Tectal and isthmic neurons were stained iontophoretically with biocytin after intracellular recording in order to investigate the fine structure and arborization pattern of dendritic and telodendritic trees. The back-projection of isthmic neurons to both tectal hemispheres exhibits a conspicuous and spatially restricted connection with tectal neurons and the afferent fiber layers, which probably plays an important role in the context of stereoscopic depth perception and detection of retinal disparities.

Animals↗
PubMed1981

Adaptation to the reversal of binocular depth cues: effects of wearing left-right reversing spectacles on stereoscopic depth perception.

The principle of stereopsis, that crossed disparity causes a convex perception and uncrossed disparity a concave one, has for a long time been considered to depend on a very rigid neural mechanism not affected by experience. Experiments are reported here which show that this relationship between disparity and perceived depth can be reversed by experience. An observer wore a pair of left-right reversing spectacles continuously for nine days. The spectacles also reversed the relation between the direction of perceived depth and the direction of binocular depth cues, ie disparity and vergence. For a period starting two days before wearing the spectacles and continuing until seventy-nine days after their removal the observer was examined with a haploscope and an electrooculograph. All the stereoscopic experiments were carried out without spectacles in order to examine some aftereffects of wearing spectacles. For the stereograms with linear contours not only the adaptive reversal of the relation between disparity and perceived depth, but also some abnormal depth perceptions and long-lasting aftereffects were found. For Julesz's random-dot stereograms, however, in which contours can be seen only after binocular combination, no adaptive change or reversal occurred. These results suggest that the process of stereopsis consists of two concurrent subprocesses.

Adaptation, Ocular↗
PubMed2003

Followup: a case of acute loss of binocular vision and stereoscopic depth perception. (The misery of acute monovision, having been binocular for 68 years).

This is a continuation of a personal report by a knowledgeable vision scientist, of the loss of binocular vision due to a major vitreous hemorrhage. Please see the initial report for further details. (Romano PE. A case of acute loss of binocular vision and stereoscopic depth perception. (The misery of acute monovision, having been binocular for 68 years) Binocul Vis Strabismus Q 2003; 18:51-55). This report covers months three and four following the hemorrhage. In the two months since the initial report, typical daily problems from this handicap are described. Definite evidence of progressive resolution was finally seen at the end of the third month. The speed of this resolution is about 1% per day!

Acute Disease↗
PubMed1982

Depth perception by means of ambient sounds in a small mammal.

Golden hamsters placed on a jumping stand from which they can descend onto a shallow or deep landing platform prefer to descend on to the shallow platform, even when tested under IR-light without tactile cues. This preference disappears for subjects with plugged ears. The simultaneous recording of the animal's behaviour and possible emission of ultrasound as well as experiments in which the external acoustical conditions or the sound-reflecting properties of the jumping apparatus were altered suggest that the animals use certain parameters of the ambient sound field for depth perception.

Acoustics↗
PubMed1993

Depth perception in motion parallax and stereokinesis.

Perceived depth in the stereokinetic effect (SKE) illusion and in the monocular derivation of depth from motion parallax were compared. Motion parallax gradients of velocity can be decomposed into 2 components: object- and observer-relative transformations. SKE displays present only the object-relative component. Observers were asked to estimate the magnitude and near-far order of depth in motion parallax and SKE displays. Monocular derivation of depth magnitude from motion parallax is fully accounted for by the perceptual response to the SKE, and observer-relative transformations absent in the SKE are of perceptual utility only as determinants of the near-far signing of perceived sequential depth. The amount of depth and rigidity perceived in motion parallax and SKE displays covaries with the projective size of the stimuli. The monocular derivation of depth from motion is mediated by a perceptual heuristic of which the SKE is symptomatic.

Adult↗
PubMed1980

Depth perception in strabismus.

The monocular and binocular depth thresholds of strabismic subjects have been measured with a modified Howard-Dolman apparatus. Seven out of the 14 strabismic subjects tested were found to have binocular thresholds significantly higher than their monocular ones. These strabismic subjects all had small angles of deviation less than 8 prism dioptres and high acuities in both eyes.

Adolescent↗