The role of visual evoked potential and electroretinography in the preoperative assessment of osteo‐keratoprosthesis or osteo‐odonto‐keratoprosthesis surgery

Araújo, Aline Lütz de; Charoenrook, Víctor; Paz, María Fidéliz de la; Temprano, José; Barraquer, Rafael I.; Michael, Ralph

doi:10.1111/j.1755-3768.2010.02086.x

Cited by 15 publications

(3 citation statements)

References 21 publications

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“…Electrophysiological tests like electroretinogram and visual-evoked potential could be beneficial in doubtful situations, but they may also not be precise in quantifying the visual potential in the presence of media opacities and bilateral blindness. 38 , 39 History of regaining vision with previous surgical procedures is a good indication of visual recovery. In general, a KPro is offered to patients with bilaterally poor vision to the degree of hand moments or light perception.…”

Section: General Considerations For Kpro Surgerymentioning

confidence: 99%

Keratoprostheses for corneal blindness: a review of contemporary devices

Avadhanam¹,

Smith²,

Liu³

2015

OPTH

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According to the World Health Organization, globally 4.9 million are blind due to corneal pathology. Corneal transplantation is successful and curative of the blindness for a majority of these cases. However, it is less successful in a number of diseases that produce corneal neovascularization, dry ocular surface and recurrent inflammation, or infections. A keratoprosthesis or KPro is the only alternative to restore vision when corneal graft is a doomed failure. Although a number of KPros have been proposed, only two devices, Boston type-1 KPro and osteo-odonto-KPro, have came to the fore. The former is totally synthetic and the latter is semi-biological in constitution. These two KPros have different surgical techniques and indications. Keratoprosthetic surgery is complex and should only be undertaken in specialized centers, where expertise, multidisciplinary teams, and resources are available. In this article, we briefly discuss some of the prominent historical KPros and contemporary devices.

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Section: General Considerations For Kpro Surgerymentioning

confidence: 99%

Keratoprostheses for corneal blindness: a review of contemporary devices

Avadhanam¹,

Smith²,

Liu³

2015

OPTH

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“…Infections (e.g., trachoma), ocular traumas (e.g., acid), and inflammatory/autoimmune eye diseases (e.g., pemphigus, keratitis, Lyell Syndrome) are common reasons which can lead to corneal scarring and later blindness . The OOKP is also indicated for patients who have lost conventional corneal allografts or in cases where the corneal allografts prognosis would be poor .…”

Section: Introductionmentioning

confidence: 99%

Comparison of an Er: YAG laser osteotome versus a conventional drill for the use in osteo‐ odonto‐keratoprosthesis (OOKP)

Berg

Peyer²,

Kuske

et al. 2019

Lasers Surg Med

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Objectives The osteo‐odonto‐kerato‐prosthesis (OOKP) procedure is a complex, multi‐stage, multidisciplinary surgical intervention for the treatment of severe corneal blindness. One step of the OOKP consists of creating a precise hole into a tooth in which an optic cylinder is subsequently inserted; its shape must ensure a perfect watertight fit. The Er: YAG laser (L) used in this study is part of CARLO®, the first laser osteotome that enables surgical planning based on computed tomography data, robot guidance, and a precise execution of laser cuts in teeth and bone tissue, using laser photoablation rather than conventional mechanical methods. The purpose of this study was to assess whether the Er: YAG laser is non‐inferior compared to a conventional drill. Methods Thirty‐two bovine incisors were grounded to a thickness of 1.5 mm. In 16 teeth, a 3.5 mm hole was drilled progressively into each tooth, using dental burs (B) of increasing diameter that were attached to a fixed drill machine. In the other 16 teeth, a hole was created using an Er: YAG laser at a wavelength of 2.94 µm (Part of CARLO®). In seven teeth of each group, the cylinder was inserted and fixated with polymethylmethacrylate (PMMA) bone cement. In the remaining seven teeth of each group, the cylinder was inserted without fixation material (press‐fit). After bonding and drying, all specimens were stored in water until force measurements were recorded using a uniaxial traction machine. The force required to move the optical cylinder out of the hole in the tooth was measured using an Instron 3344 testing system. Scanning electron microscope (SEM) and light microscope (LM) visualization of the holes created with the laser and the drill were performed in two teeth (SEM)/four teeth (LM) per method. Results Significant differences (P < 0.001) were found for the following parameters: B PMMA versus B press‐fit; B PMMA versus L press‐fit; L PMMA versus B press‐fit; L PMMA–L press‐fit. This shows that PMMA bone cement fixation is superior to press‐fit. No significant differences were found between B PMMA–L PMMA (P = 0.93) and B press‐fit–L press‐fit (P = 0.83). The SEM pictures showed a smoother surface using L. Conclusions The laser cut holes were as strong as bur‐drilled holes, although SEM pictures showed a smoother surface of the laser cut holes. Hence, laser osteotomes open the possibility to custom fit the hole exactly to the width of the cylinder, which represents a potential advantage of the laser over the conventional bur. Lasers Surg. Med. 51:531–537, 2019. © 2019 Wiley Periodicals, Inc.

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“…PVEPs are used to study the VA function in a number of ophthalmological and neurological diseases, for objective measurement of visual acuity and visual field in non-cooperative patients, in children and in simulation. 1–9…”

Section: Introductionmentioning

confidence: 99%

Reference values of pattern reversal visual evoked potentials in Bulgarian population

Mermeklieva

2018

European Journal of Ophthalmology

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Aims: The aim of this study is to evaluate pattern visual evoked potentials as an objective electrophysiological method and to create reference values for Bulgarian population. Methods and Materials: Standardized four-channel equipment ‘Neuro-MEP 4’ produced by ‘Neurosoft’ Company was used. A group of 47 healthy individuals (94 eyes) was studied. The stimulation was monocular, with a contrast-reversing pattern from black to white and vice versa. The investigation was performed with a three-channel recording with equipment adjustments according to the latest published ISCEV standard for pattern visual evoked potentials (2016). Based on a comprehensive overview of the available literature, a protocol of stimulating, amplifying and recording the obtained potentials has been created. The values of pattern visual evoked potential wave components, P50, N75, P100, N145 and P200, were measured. Results: Based on a created protocol, latency and amplitudes of the individual wave components of pattern visual evoked potentials were obtained. The results were statistically processed to create reference values of all pattern visual evoked potentials components, which are used as reference of the laboratory for the Bulgarian population. Conclusion: Pattern visual evoked potentials are objective electrophysiological method which is used to diagnose and monitor numerous ophthalmological and neurological diseases as well as for objective study of visual acuity and visual field in children and aggravation. The creation of pattern visual evoked potentials reference values for the Bulgarian population and its implementation in clinical practice are of particular importance for studying the visual analyser function.

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The role of visual evoked potential and electroretinography in the preoperative assessment of osteo‐keratoprosthesis or osteo‐odonto‐keratoprosthesis surgery

Cited by 15 publications

References 21 publications

Keratoprostheses for corneal blindness: a review of contemporary devices

Keratoprostheses for corneal blindness: a review of contemporary devices

Comparison of an Er: YAG laser osteotome versus a conventional drill for the use in osteo‐ odonto‐keratoprosthesis (OOKP)

Reference values of pattern reversal visual evoked potentials in Bulgarian population

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