In vivo multiphoton imaging of the human ocular anterior segment

2021 ◽  
Author(s):  
Rosa M. Martinez-Ojeda ◽  
Juan M. Bueno ◽  
Pablo Artal
Keyword(s):  
Anterior Segment ◽  
Multiphoton Imaging

scholarly journals Chemically-Boosted Corneal Cross-Linking for the Treatment of Keratoconus through a Riboflavin 0.25% Optimized Solution with High Superoxide Anion Release

2021 ◽  
Vol 10 (6) ◽  
pp. 1324
Author(s):  
Cosimo Mazzotta ◽  
Marco Ferrise ◽  
Guido Gabriele ◽  
Paolo Gennaro ◽  
Alessandro Meduri
Keyword(s):  
Superoxide Anion ◽  
Hydroxypropyl Methylcellulose ◽  
Anterior Segment ◽  
Preclinical Study ◽  
Cross Linking ◽  
Specular Microscopy ◽  
The Novel ◽  
Power Setting ◽  
Contralateral Eye

The purpose of this study was to evaluate the effectiveness and safety of a novel buffered riboflavin solution approved for corneal cross-linking (CXL) in progressive keratoconus and secondary corneal ectasia. Following the in vivo preclinical study performed on New Zealand rabbits comparing the novel 0.25% riboflavin solution (Safecross®) containing 1% hydroxypropyl methylcellulose (HPMC) with a 0.25% riboflavin solution containing 0.10% EDTA, accelerated epithelium-off CXL was performed on 10 patients (10 eyes treated, with the contralateral eye used as control) through UV-A at a power setting of 9 mW/cm2 with a total dose of 5.4 J/cm2. Re-epithelialization was evaluated in the postoperative 7 days by fluorescein dye test at biomicroscopy; endothelial cell count and morphology (ECD) were analyzed by specular microscopy at the 1st and 6th month of follow-up and demarcation line depth (DLD) measured by anterior segment optical coherence tomography (AS-OCT) one month after the treatment. We observed complete re-epithelization in all eyes between 72 and 96 h after surgery (88 h on average). ECD and morphology remained unchanged in all eyes. DLD was detected at a mean depth of 362 ± 50 µm, 20% over solutions with equivalent dosage. SafeCross® riboflavin solution chemically-boosted corneal cross-linking seems to optimize CXL oxidative reaction by higher superoxide anion release, improving DLD by a factor of 20%, without adverse events for corneal endothelium.

Characteristics of Linear Interstitial Keratitis by In Vivo Confocal Microscopy and Anterior Segment Optical Coherence Tomography

Cornea ◽  
2018 ◽  
Vol 37 (6) ◽  
pp. 785-788
Author(s):  
Aleksandra Petrovic ◽  
Kattayoon Hashemi ◽  
Frank Blaser ◽  
Wolfgang Wild ◽  
George Kymionis
Keyword(s):  
Optical Coherence Tomography ◽  
Confocal Microscopy ◽  
Anterior Segment ◽  
Optical Coherence ◽  
In Vivo Confocal Microscopy ◽  
Interstitial Keratitis

Uveo-scleral outflow pathways after ultrasonic cyclocoagulation in refractory glaucoma: an anterior segment optical coherence tomography and in vivo confocal study

2016 ◽  
Vol 100 (12) ◽  
pp. 1668-1675 ◽  
Author(s):  
Rodolfo Mastropasqua ◽  
Luca Agnifili ◽  
Vincenzo Fasanella ◽  
Lisa Toto ◽  
Lorenza Brescia ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Segment ◽  
Optical Coherence ◽  
Refractory Glaucoma

P2-164: In vivo multiphoton imaging of neurofibrillary tangles: Relationship to cell death cascades

2008 ◽  
Vol 4 ◽  
pp. T418-T418
Author(s):  
Alix de Calignon ◽  
Tara Spires-Jones ◽  
Bradley T. Hyman
Keyword(s):  
Cell Death ◽  
Neurofibrillary Tangles ◽  
Multiphoton Imaging

Clinical and morphological manifestations of aniridia-associated keratopathy on anterior segment optical coherence tomography and in vivo confocal microscopy

2017 ◽  
Vol 15 (4) ◽  
pp. 759-769 ◽  
Author(s):  
Anna Voskresenskaya ◽  
Nadezhda Pozdeyeva ◽  
Tatyana Vasilyeva ◽  
Yevgeniy Batkov ◽  
Aleksandr Shipunov ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Confocal Microscopy ◽  
Anterior Segment ◽  
Optical Coherence ◽  
In Vivo Confocal Microscopy

An in vivo confocal microscopy study of corneal changes in pseudoexfoliation syndrome

2018 ◽  
Vol 29 (5) ◽  
pp. 555-560 ◽  
Author(s):  
Luca Terracciano ◽  
Michela Cennamo ◽  
Eleonora Favuzza ◽  
Litasova Julia ◽  
Orsola Caporossi ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Anterior Segment ◽  
Senile Cataract ◽  
Nerve Plexus ◽  
Pseudoexfoliation Syndrome ◽  
Control Group ◽  
In Vivo Confocal Microscopy ◽  
Corneal Sensitivity ◽  
Corneal Layer

Purpose: To evaluate, through the in vivo confocal microscopy, the pathological changes of each corneal layer in eyes affected by pseudoexfoliation syndrome. Methods: We studied 40 eyes of 40 patients with diagnosis of unilateral senile cataract associated with pseudoexfoliation syndrome and 40 eyes of 40 control subjects with senile cataract without pseudoexfoliation syndrome. All patients underwent a complete ophthalmic examination including best corrected visual acuity, slit-lamp examination, corneal sensitivity measurement using a Cochet-Bonnet nylon thread esthesiometer, and anterior segment optical coherence tomography (Visante OCT, Carl Zeiss Meditec AG, Germany); in vivo confocal microscopy of corneal sections (endothelium, stroma, sub-basal nerve plexus, and superficial and basal epithelium) was performed with the ConfoScan 4.0 (Nidek, Japan). Results: In pseudoexfoliation syndrome group, the mean corneal sensitivity was 44.1 ± 1.3 mm and in the control group was 55.6 ± 4.7 mm. The corneas of the eyes with pseudoexfoliation syndrome were significantly less sensitive than those of control group eyes (p < 0.001). Pseudoexfoliation syndrome eyes had a lower nerve density and less nerve beadings and a higher degree of tortuosity in sub-basal plexus compared to the control group. The cell density of epithelial and endothelial layers was significantly lower in pseudoexfoliation syndrome eyes than controls. In 80% of pseudoexfoliation syndrome eyes, we found activated keratocytes and inflammatory cells in the anterior stroma. Conclusion: Our study demonstrates the morpho-structural corneal alterations in eyes affected by pseudoexfoliation syndrome, using corneal in vivo confocal microscopy as a non-invasive and high-reproducible technique to evaluate pathophysiology of each corneal layer; the sub-basal nerve plexus alterations are correlated with the lower corneal sensitivity.

Signalling by FGF8 from the isthmus patterns anterior hindbrain and establishes the anterior limit of Hox gene expression

Development ◽  
2000 ◽  
Vol 127 (1) ◽  
pp. 177-186 ◽  
Author(s):  
C. Irving ◽  
I. Mason
Keyword(s):  
Gene Expression ◽  
Hox Genes ◽  
Protein A ◽  
Anterior Segment ◽  
Morphogen Gradient ◽  
Current Evidence ◽  
Hox Gene ◽  
Developmental Fate ◽  
Developmental Patterning

Current evidence suggests that the anterior segment of the vertebrate hindbrain, rhombomere 1, gives rise to the entire cerebellum. It is situated where two distinct developmental patterning mechanisms converge: graded signalling from an organising centre (the isthmus) located at the midbrain/hindbrain boundary confronts segmentation of the hindbrain. The unique developmental fate of rhombomere 1 is reflected by it being the only hindbrain segment in which no Hox genes are expressed. In this study we show that ectopic FGF8 protein, a candidate for the isthmic organising activity, is able to induce and repress gene expression within the hindbrain in a manner appropriate to rhombomere 1. Using a heterotopic, heterospecific grafting strategy we demonstrate that rhombomere 1 is able to express Hox genes but that both isthmic tissue and FGF8 inhibit their expression. Inhibition of FGF8 function in vivo shows that it is responsible for defining the anterior limit of Hox gene expression within the developing brain and thereby specifies the extent of the rl territory. Previous studies have suggested that a retinoid morphogen gradient determines the axial limit of expression of individual Hox genes within the hindbrain. We propose a model whereby activation by retinoids is antagonised by inhibition by FGF8 in the anterior hindbrain to set aside the territory from which the cerebellum will develop.

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