Sudden onset diplopia can be the result of underlying systemic or neurological conditions. I present the case of a 32-year-old woman with a previously diagnosed convergence insufficiency, who developed sudden diplopia. Physicians ruled out systemic and neurological conditions, but were unable to resolve the diplopia. Functional optometric examination with vectographic targets showed Intermitten...

Classically, it has been assumed that visual space can be represented by a metric. This means that the distance between points and the angle between lines can be uniquely defined. However, this assumption has never been tested. Also, measurements outdoors, where monocular cues are abundant, conflict with this model. This paper reports on two experiments in which the structure of visual space wa...

There is a long-running debate over the extent to which volitional attention can modulate the appearance of visual stimuli. Here we use monocular rivalry between afterimages to explore the effects of attention on the contents of visual experience. In three experiments, we demonstrate that attended afterimages are seen for longer periods, on average, than unattended afterimages. This occurs both...

A new technique for the treatment of diplopia secondary to cosmetic botulinum toxin A use is described. In this interventional case reports, two consecutive patients who developed diplopia after periocular cosmetic use of botulinum toxin A were treated with intramuscular botulinum toxin A injection into the antagonist extraocular muscle. Diplopia resolved in both patients in less than 1 week wi...

A 21-year-old woman presented to the emergency department 1 day after a fall. On the day of presentation, she awoke with horizontal diplopia and posterior neck pain. Based on clinical findings, she was diagnosed with bilateral internuclear ophthalmoplegia. A conventional angiogram identified a left vertebral artery dissection. She was started on anticoagulant therapy, with gradual improvement o...

OBJECTIVES To report the occurrence of persistent diplopia manifesting after refractive surgery, to describe the different causes of this complication, to provide risk stratification for its occurrence, and to outline minimal screening techniques for its prevention. METHODS A retrospective medical record review of patients seen in 2 private strabismus practices who experienced persistent dipl...

BACKGROUND AND OBJECTIVE In an orbital fracture involving diplopia, enophthalmos is a major problem to be corrected because ofsoft tissue swelling and limited incision, which causes inaccurate restoration oforbital anatomy and reestablishing orbital volume. Pre-operative computerized planning combined with intra-operative navigation and endoscopy are used to create the accurate anatomical orbit...

As a single aperture, approximately monofocal optical system, the human eye generally creates a single image on the retina. However, the literature contains many reports of perceptual monocular diplopia. While it is easy to understand how distortion may produce monocular diplopia, its reported high incidence in normal eyes is less easily understood. We examine a model which ascribes monocular d...

Headache is a frequent complaint in coronavirus disease-19 (COVID-19) patients. Nevertheless, no detailed information on the pathophysiology of headache COVID-19 infection currently limited. We encountered patient developing headache, diplopia, and intracranial hypertension after infection. The more complained diplopia pressure was normalized. Our case suggests that mechanism report herein tran...

Orbital blowout fractures are relatively rare in patients under 18 years of age, but may lead to serious complications. We conducted this retrospective study to evaluate diplopia, clinical characteristics, and postoperative results in cases of orbital blowout fractures in the pediatric population. Eighty-three patients, all less than 18 years old, with orbital blowout fractures, were divided in...