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ocular misalignment

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https://www.readbyqxmd.com/read/29133438/normal-topography-and-binocularity-of-the-superior-colliculus-in-strabismus
#1
John R Economides, Brittany C Rapone, Daniel L Adams, Jonathan C Horton
In subjects with alternating strabismus either eye can be used to saccade to visual targets. The brain must calculate the correct vector for each saccade, which will depend on the eye chosen to make it. The superior colliculus, a major midbrain center for saccade generation, was examined to determine if the maps serving each eye were shifted to compensate for strabismus.Alternating exotropia was induced in two male macaques at age one month by sectioning the tendons of the medial recti. Once the animals grew to maturity, they were trained to fixate targets with either eye...
November 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29130674/-efficacy-of-superior-rectus-and-lateral-rectus-muscle-belly-union-surgery-for-myopic-strabismus-fixus
#2
Guo-Yuan Yang, Long-Qian Liu
OBJECTIVE: To evaluate the effectiveness of superior rectus (SR) and lateral rectus (LR) union suture without scleral fixation for the treatment of myopic strabismus fixus. METHODS: A retrospective review was performed on 27 eyes of 16 patients who underwent lateral part of SR and superior part of LR muscle belly union between January 2010 and October 2015. We collected the ocular data including: best corrected visual acuity,axial length,CT or MRI images,orthoptic measurements (by prism test),and eye movements pre- and postoperatively...
September 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/29066238/ocular-features-of-multiple-system-atrophy
#3
Maria D Garcia, Jose S Pulido, Elizabeth A Coon, John J Chen
The aim of this paper is to gain better understanding of the ocular manifestations of multiple system atrophy (MSA), a neurodegenerative disorder rarely studied in terms of its ophthalmologic features. We performed a retrospective case series (1/1/05-12/31/14) to search for patients seen at Mayo Clinic, Rochester, MN, who had mention of MSA in the medical record and an eye examination, which yielded 285 cases. Of the 285, we identified 39 cases of true MSA. Each of these 39 patients was further reviewed for ocular abnormalities potentially related to MSA...
October 21, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29064832/prototype-tests-of-vertical-and-torsional-alignment-nulling-for-screening-vestibular-function
#4
M C Schubert, J Stitz, H S Cohen, H Sangi-Haghpeykar, A P Mulavara, B T Peters, J J Bloomberg
BACKGROUND: We have developed a non-invasive, behavioral measure of ocular alignment using a computer tablet, colored lenses, and touch screen software. OBJECTIVE: The goal of this study was to determine if these tests differentiate healthy controls from patients with vestibular disorders. METHODS: In the vertical alignment nulling test (VAN), subjects were asked to adjust a horizontal line that was offset vertically from a fixed horizontal line...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29018750/management-of-diplopia-with-visual-field-defects
#5
Ling-Yuh Kao, Chun-Hsiu Liu, Meng-Ling Yang
PURPOSE: The management of diplopia can be challenging in patients with a concurrent visual-field (VF) defect. We conducted a retrospective chart review to analyze and compare treatment outcomes for different types of VF defects. METHODS: A retrospective chart review. RESULTS: Seven patients with diplopia and VF defects were identified during the study. Four had bitemporal hemianopia, one had homonymous hemianopia, and two had a constricted central VF...
January 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/28990829/diplopia-after-cataract-extraction
#6
Marc A Bouffard, Dean M Cestari
Diplopia after cataract extraction is an unexpected outcome for the patient and often a source of confusion for the physician, owing to its relative infrequency. This article reviews the pertinent literature on the subject. Mechanisms include anesthetic myotoxicity, surgical trauma, optical aberrations, cortical disorders in patients with congenital strabismus, and the unmasking of previously unnoticed ocular misalignment. As the population continues to age and cataract extraction is performed in increasing volume, familiarity with this uncommon but important outcome may help to clarify and effectively treat post-cataract-extraction diplopia...
October 9, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/28759292/an-optimal-measurement-of-fixation-disparity-using-ogle-s-apparatus
#7
L de Meij, M A J Telleman, M R C Luijten, J R Polling, M Gutter
PURPOSE: Fixation disparity (FD) is a small misalignment of the eyes within the normal alignment when viewing under binocular condition. Ogle's apparatus measures FD. Standards of procedures vary, which may lead to different outcomes. METHODS: Students with normal ocular alignment, stereopsis ≤60 seconds of arc and visual acuity <0.1 logMAR, were included in this prospective comparative study. Four procedures (P1-P4) of measuring FD with Ogle's apparatus were performed with divergent placement of the line (P1 and P3), or the line moving from subjective zero (P1 and P2: prisms of ascending strength; P3 and P4: prisms alternating base in base out; combined and P4)...
September 2017: Strabismus
https://www.readbyqxmd.com/read/28728924/strabismus-measurements-with-novel-video-goggles
#8
Konrad P Weber, Daniel Rappoport, Muriel Dysli, Tanja Schmückle Meier, Guy B Marks, Christopher J Bockisch, Klara Landau, Hamish G MacDougall
PURPOSE: To assess the validity of a novel, simplified, noninvasive test for strabismus using video goggles. DESIGN: Cross-sectional method comparison study in which the new test, the strabismus video goggles, is compared with the existing reference standard, the Hess screen test. PARTICIPANTS: We studied 41 adult and child patients aged ≥6 years with ocular misalignment owing to congenital or acquired paralytic or comitant strabismus and 17 healthy volunteers...
July 17, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28704144/orbital-ultrasonography-in-the-diagnosis-of-neoplastic-extraocular-muscle-enlargement
#9
Giovanni H Greaves, Kym Livingston, Grant T Liu, Kenneth S Shindler, Nicholas J Volpe, Maxwell Pistilli, Sonul Mehta, Madhura A Tamhankar
Neoplastic infiltration of the extraocular muscle (EOM) is a rare condition which can pose a diagnostic dilemma due to its rarity and overlapping ultrasonographic features with orbital myositis. The ultrasonographic features of neoplastic enlargement of EOM have not been systematically studied and previously have been described in only a few case reports. Orbital ultrasonography, in conjunction with the pattern of ocular misalignment, was assessed for its potential role in identifying patients with neoplastic EOM enlargement...
July 13, 2017: Orbit
https://www.readbyqxmd.com/read/28681278/are-we-overlooking-masked-bilateral-congenital-superior-oblique-palsy-in-children-is-it-possible-to-diagnose-before-surgery
#10
Kadriye Erkan Turan, Hande Taylan Sekeroglu, Ali Sefik Sanac
PURPOSE: To describe the characteristics of children who had subsequent contralateral superior oblique underaction (SOUA) and inferior oblique overaction (IOOA) after unilateral inferior oblique weakening surgery and to identify suggestive clinical features for masked bilateral fourth nerve palsy. METHODS: The medical records of children who underwent unilateral inferior oblique tenotomy as a single procedure for unilateral superior oblique palsy were all reviewed...
July 5, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28574497/stepping-into-the-virtual-unknown-feasibility-study-of-a-virtual-reality-based-test-of-ocular-misalignment
#11
N Nesaratnam, P Thomas, A Vivian
IntroductionDissociated tests of strabismus provide valuable information for diagnosis and monitoring of ocular misalignment in patients with normal retinal correspondence. However, they are vulnerable to operator error and rely on a fixed head position. Virtual reality headsets obviate the need for head fixation, while providing other clear theoretical advantages, including complete control over the illumination and targets presented for the patient's interaction.PurposeWe compared the performance of a virtual reality-based test of ocular misalignment to that of the traditional Lees screen, to establish the feasibility of using virtual reality technology in ophthalmic settings in the future...
October 2017: Eye
https://www.readbyqxmd.com/read/28442887/management-of-duane-retraction-syndrome-with-prismatic-glasses
#12
Ebru Demet Aygit, Murat Kocamaz, Asli Inal, Korhan Fazil, Osman Bulut Ocak, Serpil Akar, Birsen Gokyigit
PURPOSE: To report the results of using prismatic glasses for Duane retraction syndrome (DRS). METHODS: Data were obtained from the records of patients who were evaluated during the year 2000 in the Strabismus Unit of the Beyoglu Eye Training and Research Hospital. The average follow-up was 12.2±17.7 months. In all cases, 2 main variables were evaluated: horizontal deviation in the primary position and face turn. Prismatic glasses were provided to patients according to the degree of shift in the primary position...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28325621/-diplopia-an-important-symptom-in-internal-medicine
#13
S Bidot, V Biousse
Diplopia is defined as "double vision" when looking at a single object. Monocular diplopia is related to an ocular disorder and must be differentiated from binocular diplopia which is secondary to ocular misalignment. The examination of the patient with binocular diplopia is often challenging for non-specialists. However, a careful and systematic clinical examination followed by targeted ancillary testing allows the clinician to localize the lesion along the oculomotor pathways. The lesion may involve the brainstem, the ocular motor nerves III, IV or VI, the neuromuscular junction, the extraocular ocular muscles, or the orbit...
March 18, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28300605/a-rapid-quantification-of-binocular-misalignment-without-recording-eye-movements-vertical-and-torsional-alignment-nulling
#14
Kara H Beaton, Mark J Shelhamer, Dale C Roberts, Michael C Schubert
BACKGROUND: Small, innate asymmetries between the left and right otolith organs can cause ocular misalignment with symptoms that include double vision and motion sickness. Additionally, ocular misalignment affects nearly 5% of the US population. We have developed a portable, non-invasive technology that uses subjective perception of binocular visual signals to estimate relative binocular alignment. NEW METHOD AND RESULTS: The Vertical Alignment Nulling (VAN) and Torsional Alignment Nulling (TAN) tests ask subjects to view one red and one blue line on a tablet computer while looking through color-matched red and blue filters so that each eye sees only one of the lines...
March 12, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28286307/strabismus-surgery-outcomes-in-eyes-with-glaucoma-drainage-devices
#15
Carla J Osigian, Kara M Cavuoto, Julia D Rossetto, Mohamed Sayed, Sara Grace, Ta C Chang, Hilda Capo
PURPOSE: To report strabismus surgery outcomes in eyes with prior implantation of glaucoma drainage devices (GDD). METHODS: The medical records of patients who underwent strabismus surgery for ocular misalignment that developed after implantation of a GDD over a 13-year period at a single institution were examined retrospectively. Patient characteristics, deviation types, preoperative measurements, surgical procedures, and postoperative measurements were analyzed...
April 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28255284/clinical-evaluation-of-blepharoptosis-distinguishing-age-related-ptosis-from-masquerade-conditions
#16
REVIEW
Michelle W Latting, Alison B Huggins, Douglas P Marx, Joseph N Giacometti
Aponeurotic ptosis accounts for the majority of acquired ptosis encountered in clinical practice. Other types of ptosis include traumatic, mechanical, neurogenic, and myogenic. In addition to true ptosis, some patients present with pseudoptosis caused by globe dystopia, globe asymmetry, ocular misalignment, or retraction of the contralateral lid. It is particularly important for the clinician to rule out neurologic causes of ptosis such as dysfunction of the third cranial nerve, Horner's syndrome, and myasthenia gravis, as these conditions can be associated with significant systemic morbidity and mortality...
February 2017: Seminars in Plastic Surgery
https://www.readbyqxmd.com/read/28254627/inferior-rectus-transposition-a-novel-procedure-for-abducens-palsy
#17
Federico G Velez, Melinda Y Chang, Stacy L Pineles
PURPOSE: Superior rectus transposition has been popularized for the treatment of abduction deficiencies. Potential complications include induced vertical deviation and torsion. A new procedure, the inferior rectus transposition (IRT), may be similarly beneficial for patients at risk for postoperative vertical deviation or incyclotropia. The purpose of this study is to describe the outcomes of patients undergoing IRT. DESIGN: Prospective, interventional case series...
May 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28243072/subconjunctival-orbital-fat-prolapse-and-thyroid-associated-orbitopathy-a-clinical-association
#18
Klio I Chatzistefanou, Christianna Samara, Ioannis Asproudis, Dimitrios Brouzas, Marilita M Moschos, Elisabeth Tsianta, George Piaditis
BACKGROUND: Thyroid associated orbitopathy (TAO) comprises a spectrum of well-recognized clinical signs including exophthalmos, eyelid retraction, soft tissue swelling, ocular misalignment, keratopathy as well as a number of less common manifestations. Subconjunctival fat prolapse is a rare clinical condition occurring typically spontaneously in elderly patients with a mean age of 65-72 years. We describe subconjunctival prolapse of orbital fat as an uncommon clinical association of TAO...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28009406/the-frequency-and-causes-of-abnormal-head-position-based-on-an-ophthalmology-clinic-s-findings-is-it-overlooked
#19
Kadriye Erkan Turan, Hande Taylan Sekeroglu, Irem Koc, Meltem Kilic, Ali S Sanac
PURPOSE: To determine the frequency of abnormal head position (AHP) and identify the underlying causes in patients who presented to an ophthalmology clinic due to any ophthalmologic complaint. METHODS: The medical records of patients who presented with any ophthalmologic symptoms during a 6-month period were prospectively evaluated. In all, 2,710 patients (1,492 female and 1,218 male) aged 6 months-91 years were included in the study. Each patient underwent complete ophthalmologic evaluation...
June 26, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/27651233/surgical-planning-and-innervation-in-pontine-gaze-palsy-with-ipsilateral-esotropia
#20
Deniz Somer, Fatma Gul Cinar, Ahmet Kaderli, Firdevs Ornek
PURPOSE: To discuss surgical intervention strategies among patients with horizontal gaze palsy with concurrent esotropia. METHODS: Five consecutive patients with dorsal pontine lesions are presented. Each patient had horizontal gaze palsy with symptomatic diplopia as a consequence of esotropia in primary gaze and an anomalous head turn to attain single binocular vision. RESULTS: Clinical findings in the first 2 patients led us to presume there was complete loss of rectus muscle function from rectus muscle palsy...
October 2016: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
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