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Artemis cornea

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https://www.readbyqxmd.com/read/27843416/artemis-very-high-frequency-digital-ultrasound-guided-femtosecond-laser-recut-after-flap-complication
#1
Dan Z Reinstein, Zachary Dickeson, Timothy J Archer, Marine Gobbe
Incomplete flaps are a relatively uncommon complication of laser-assisted in situ keratomileusis (LASIK) that occur when creation of the corneal flap is interrupted. Further complications can arise if a second flap is created that intersects the original flap interface, resulting in tissue slivers that can lead to more complications and poor visual outcomes. We report the case of a 56-year-old man who underwent LASIK in which an incomplete flap occurred after 45% completion using a mechanical microkeratome with a 160 µm head...
2014: Digital Journal of Ophthalmology: DJO
https://www.readbyqxmd.com/read/26432113/corneal-sensitivity-after-small-incision-lenticule-extraction-and-laser-in-situ-keratomileusis
#2
COMPARATIVE STUDY
Dan Z Reinstein, Timothy J Archer, Marine Gobbe, Elena Bartoli
PURPOSE: To longitudinally evaluate corneal sensitivity after small-incision lenticule extraction and compare the results with those in previous studies. SETTING: London Vision Clinic, London, United Kingdom. DESIGN: Retrospective case series. METHODS: Consecutive myopic eyes treated with small-incision lenticule extraction using the Visumax femtosecond laser were studied. Corneal sensitivity was measured centrally and at 4 paracentral locations using a Cochet-Bonnet esthesiometer preoperatively and 1 day, 1 week, and 1, 3, 6, and 12 months postoperatively...
August 2015: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/26186562/comparison-of-corneal-epithelial-thickness-measurement-between-fourier-domain-oct-and-very-high-frequency-digital-ultrasound
#3
COMPARATIVE STUDY
Dan Z Reinstein, Timothy E Yap, Timothy J Archer, Marine Gobbe, Ronald H Silverman
PURPOSE: To compare measurements of corneal epithelial thickness using optical coherence tomography (OCT) and very high-frequency digital ultrasound (VHFDU). METHODS: Retrospective analysis of 189 virgin corneas and 175 post-laser refractive surgery (LRS) corneas that had corneal epithelial thickness measurement with RTVue Fourier-domain OCT (Optovue, Inc., Fremont, CA) (tear film included) and Artemis VHFDU (ArcScan Inc., Morrison, CO) (tear film excluded). Averages were calculated for the central 2-mm diameter zone and for two further concentric annuli of 1...
July 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/25599543/stromal-surface-topography-guided-custom-ablation-as-a-repair-tool-for-corneal-irregular-astigmatism
#4
Dan Z Reinstein, Marine Gobbe, Timothy J Archer, Gerhard Youssefi, Hugo F S Sutton
PURPOSE: To illustrate the concept of using a stromal surface topography-guided procedure for therapeutic repair after a complication following primary laser refractive surgery. METHODS: One case example of therapeutic retreatment for short nasal flap after primary LASIK performed in September 2000 is presented. The Artemis very high-frequency digital ultrasound arc-scanner (Arc-Scan, Inc., Morrison, CO) was used to obtain layered corneal thickness including epithelial thickness profile...
January 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/24893355/lenticule-thickness-readout-for-small-incision-lenticule-extraction-compared-to-artemis-three-dimensional-very-high-frequency-digital-ultrasound-stromal-measurements
#5
Dan Z Reinstein, Timothy J Archer, Marine Gobbe
PURPOSE: To evaluate the accuracy of the lenticule thickness readout for small incision lenticule extraction (SMILE) with the VisuMax femtosecond laser (Carl Zeiss Meditec, Jena, Germany). METHODS: Artemis very high-frequency digital ultrasound (ArcScan, Inc., Morrison, CO) measurements were obtained before and 3 months after SMILE in 70 eyes of 37 patients. The Artemis measured lenticule thickness was calculated as the maximum difference in stromal thickness before and after treatment...
May 2014: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/24864597/measurements-of-central-corneal-thickness-using-two-immersion-ultrasound-techniques-and-optical-technique
#6
Haya Matouq AlFarhan
OBJECTIVE: To compare the accuracy of central corneal thickness measurements using ultrasound biomicroscopy, Orbscan II tomography and an Artemis-2 very high frequency ultrasound scanner. METHODS: The prospective study was conducted at Eye World Centre, Riyadh, Saudi Arabia, from September to November 2012. One eye from each of 60 normal subjects was analysed. The central corneal thickness was measured using ultrasound biomicroscopy, Orbscan II tomography and the Artemis-2 very high frequency ultrasound scanner...
March 2014: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/24557351/epithelial-remodeling-as-basis-for-machine-based-identification-of-keratoconus
#7
Ronald H Silverman, Raksha Urs, Arindam Roychoudhury, Timothy J Archer, Marine Gobbe, Dan Z Reinstein
PURPOSE: To develop and evaluate automated computerized algorithms for differentiation of normal and keratoconus corneas based solely on epithelial and stromal thickness data. METHODS: Maps of the corneal epithelial and stromal thickness were generated from Artemis-1 very high-frequency ultrasound arc-scans of 130 normal and 74 keratoconic subjects diagnosed by combined topography and tomography examination. Keratoconus severity was graded based on anterior curvature, minimum corneal thickness, and refractive error...
March 13, 2014: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/23909779/improved-effectiveness-of-transepithelial-ptk-versus-topography-guided-ablation-for-stromal-irregularities-masked-by-epithelial-compensation
#8
COMPARATIVE STUDY
Dan Z Reinstein, Timothy J Archer, Marine Gobbe
PURPOSE: To demonstrate improved effectiveness of transepithelial phototherapeutic keratectomy (PTK) where topography-guided ablation is degraded by epithelial compensation for localized irregularities. METHODS: Artemis very high-frequency digital ultrasound (ArcScan Inc., Morrison, CO) scanning was performed on five eyes (four patients) after LASIK in which a truncated nasal flap was created but the ablation was still performed, resulting in irregular astigmatism and double vision...
August 2013: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/23205905/comparison-of-artemis-2-ultrasound-and-visante-optical-coherence-tomography-corneal-thickness-profiles
#9
COMPARATIVE STUDY
Roxana Ursea, Matthew Feng, Raksha Urs, Arindam RoyChoudhury, Ronald H Silverman
PURPOSE: To compare corneal thickness profiles of cross-sections of cornea determined by arc-scanned immersion ultrasound and optical coherence tomography (OCT). METHODS: Corneas of 28 eyes from 14 participants were scanned in triplicate using the Artemis 2 high-frequency arc-scanned ultrasound system (ArcScan Inc) and the Visante OCT system (Carl Zeiss Meditec). Corneal thickness and reproducibility were compared within 3.5 mm of central cornea in the horizontal plane...
January 2013: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/22947295/refractive-and-topographic-errors-in-topography-guided-ablation-produced-by-epithelial-compensation-predicted-by-3d-artemis-vhf-digital-ultrasound-stromal-and-epithelial-thickness-mapping
#10
Dan Z Reinstein, Timothy J Archer, Marine Gobbe
PURPOSE: To describe and quantify the errors inherent to topography-guided ablation of irregular corneas due to natural epithelial thickness compensatory remodeling. METHODS: Artemis very high-frequency (VHF) digital ultrasound scanning (ArcScan Inc) was performed on a cornea that had undergone radial keratotomy with inferior and superior trapezoidal keratotomies, resulting 27 years later in high irregular astigmatism (+6.50 -8.00 × 101) and severe loss of corrected distance visual acuity (CDVA) to 20/50...
September 2012: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/22767168/anterior-segment-biometry-a-study-and-review-of-resolution-and-repeatability-data
#11
REVIEW
Dan Z Reinstein, Marine Gobbe, Timothy J Archer
PURPOSE: To obtain comparable resolution and repeatability data for a selection of anterior segment imaging devices. METHODS: A standard letter of request was sent in May 2008 to each device manufacturer requesting resolution and repeatability data for its device to be provided according to specific definitions and protocol; if this was not already published in the peer-reviewed domain, compliant raw data were required. Where applicable, repeatability data were reported for corneal vertex corneal thickness; epithelial and flap thickness; minimum corneal thickness; corneal, epithelial and flap thickness mapping for the central 6-mm diameter; minimum residual stromal thickness; angle-to-angle diameter; sulcus-to-sulcus diameter; and anterior chamber depth...
July 2012: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/22701079/correlation-between-epithelial-thickness-in-normal-corneas-untreated-ectatic-corneas-and-ectatic-corneas-previously-treated-with-cxl-is-overall-epithelial-thickness-a-very-early-ectasia-prognostic-factor
#12
Anastasios John Kanellopoulos, Ioannis M Aslanides, George Asimellis
PURPOSE: To determine and correlate epithelial corneal thickness (pachymetric) measurements taken with a digital arc scanning very high frequency ultrasound biomicroscopy (HF UBM) imaging system (Artemis-II), and compare mean and central epithelial thickness among normal eyes, untreated keratoconic eyes, and keratoconic eyes previously treated with collagen crosslinking (CXL). METHODS: Epithelial pachymetry measurements (topographic mapping) were conducted on 100 subjects via HF UBM...
2012: Clinical Ophthalmology
https://www.readbyqxmd.com/read/21323239/epithelial-thickness-up-to-26-years-after-radial-keratotomy-three-dimensional-display-with-artemis-very-high-frequency-digital-ultrasound
#13
Dan Z Reinstein, Timothy J Archer, Marine Gobbe
PURPOSE: To characterize the epithelial thickness profile in a population of eyes after radial keratotomy for myopia. METHODS: The epithelial thickness profile was measured in vivo by Artemis very high-frequency digital ultrasound arc-scanning (ArcScan Inc) across the central 10-mm diameter of the cornea on 14 eyes after radial keratotomy for myopia. Maps of the mean and standard deviation of epithelial thickness were plotted and compared to the epithelial thickness of a previously published population of normal untreated eyes...
August 2011: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/20415322/epithelial-stromal-and-total-corneal-thickness-in-keratoconus-three-dimensional-display-with-artemis-very-high-frequency-digital-ultrasound
#14
Dan Z Reinstein, Marine Gobbe, Timothy J Archer, Ronald H Silverman, D Jackson Coleman
PURPOSE: To characterize the epithelial, stromal, and total corneal thickness profile in a population of eyes with keratoconus. METHODS: Epithelial, stromal, and total corneal thickness profiles were measured in vivo by Artemis very high-frequency (VHF) digital ultrasound scanning (ArcScan) across the central 6- to 10-mm diameter of the cornea on 54 keratoconic eyes. Maps of the average, standard deviation, minimum, maximum, and range of epithelial, stromal, and total corneal thickness were plotted...
April 2010: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/19928698/repeatability-of-layered-corneal-pachymetry-with-the-artemis-very-high-frequency-digital-ultrasound-arc-scanner
#15
Dan Z Reinstein, Timothy J Archer, Marine Gobbe, Ronald H Silverman, D Jackson Coleman
PURPOSE: To assess the three-dimensional repeatability of thickness measurements for epithelium, stroma, cornea, flap, and residual stromal bed using the Artemis very high-frequency (VHF) digital ultrasound arc-scanner (ArcScan Inc). METHODS: Five consecutive measurements were obtained for 10 eyes of 10 patients 1 year after LASIK using the Artemis VHF digital ultrasound arc-scanner across the central 10-mm diameter of the cornea. Repeatability analysis was performed for thickness measurements for each corneal layer-epithelium, stroma, cornea, flap, and residual stromal bed...
September 2010: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/19928697/epithelial-thickness-after-hyperopic-lasik-three-dimensional-display-with-artemis-very-high-frequency-digital-ultrasound
#16
Dan Z Reinstein, Timothy J Archer, Marine Gobbe, Ronald H Silverman, D Jackson Coleman
PURPOSE: To characterize the epithelial thickness profile in a population of eyes after LASIK for hyperopia or hyperopic astigmatism. METHODS: The epithelial thickness profile was measured in vivo by Artemis very high-frequency (VHF) digital ultrasound scanning (ArcScan Inc) across the central 10-mm diameter of the cornea on 65 eyes at least 3 months after hyperopic LASIK using a 7-mm ablation zone with the MEL 80 excimer laser (Carl Zeiss Meditec). Maps of the average, standard deviation, minimum, maximum, and range of epithelial thickness were plotted...
August 2010: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/19772263/stromal-thickness-in-the-normal-cornea-three-dimensional-display-with-artemis-very-high-frequency-digital-ultrasound
#17
Dan Z Reinstein, Timothy J Archer, Marine Gobbe, Ronald H Silverman, D Jackson Coleman
PURPOSE: To characterize the stromal thickness profile in a population of normal eyes. METHODS: Stromal thickness profile was measured in vivo by Artemis very high-frequency digital ultrasound scanning (ArcScan, Morrison, Colo) across the central 10-mm corneal diameter on 110 normal eyes. Maps of the average, standard deviation, minimum, maximum, and range of stromal thickness were plotted. The average location of the thinnest stroma was found. The cross-sectional hemi-meridional stromal thickness profile was calculated using annular averaging...
September 2009: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/19662913/stability-of-lasik-in-topographically-suspect-keratoconus-confirmed-non-keratoconic-by-artemis-vhf-digital-ultrasound-epithelial-thickness-mapping-1-year-follow-up
#18
Dan Z Reinstein, Timothy J Archer, Marine Gobbe
PURPOSE: To determine the 1-year stability of LASIK in corneas with topographic suspect keratoconus confirmed as non-keratoconic by epithelial thickness mapping. METHODS: This was a retrospective case/control comparative study. Eyes suspected of keratoconus using criteria based mainly on Atlas (Carl Zeiss Meditec AG) and Orbscan II (Bausch & Lomb) topography were scanned by Artemis very high-frequency digital ultrasound (ArcScan Inc). Keratoconus was confirmed if the epithelial thickness profile showed relative epithelial thinning coincident with an eccentric posterior elevation best-fit sphere apex...
July 2009: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/19584769/epithelial-stromal-and-corneal-pachymetry-changes-during-orthokeratology
#19
Dan Z Reinstein, Marine Gobbe, Timothy J Archer, Darren Couch, Basil Bloom
PURPOSE: To describe epithelial, stromal, and corneal thickness profile changes induced by orthokeratology treatment. METHODS: This is a case report of a mild myopic patient (OD -3.25/-0.50 x 172 and OS -3.25/-0.50 x 45) treated with orthokeratology lenses. The patient was assessed before treatment (following 2 weeks of no orthokeratology contact lens wear) and during treatment (after 30 consecutive nights of wearing orthokeratology lenses). Epithelial, stromal, and corneal thickness profile in vivo was measured by Artemis very high-frequency digital ultrasound scanning across the central 10 mm diameter of the cornea before and during orthokeratology treatment...
August 2009: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/19241769/correlation-of-anterior-chamber-angle-and-ciliary-sulcus-diameters-with-white-to-white-corneal-diameter-in-high-myopes-using-artemis-vhf-digital-ultrasound
#20
Dan Z Reinstein, Timothy J Archer, Ronald H Silverman, Mark J Rondeau, D Jackson Coleman
PURPOSE: To determine whether horizontal angle diameter and sulcus diameter can be accurately estimated by conventional external measurements in high myopic eyes. METHODS: Ten horizontal anterior segment scans were obtained with the Artemis 1 very high-frequency (VHF) digital ultrasound arc-scanner in 40 eyes of 20 patients. Angle and sulcus diameters were measured and descriptive statistics and within-eye repeatability were calculated. Linear regression was performed between each permutation of white-to-white, angle diameter, and sulcus diameter...
February 2009: Journal of Refractive Surgery
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