1. Articles from Geunyoung Yoon

    1-8 of 8
    1. Open Rank Tenure Track Faculty Position in Retina Research, University of Rochester, Rochester, NY

      Open Rank Tenure Track Faculty Position in Retina Research, University of Rochester, Rochester, NY

      Open Rank Tenure Track Faculty Position in Retina Research, University of Rochester, Rochester, NY The University of Rochester Flaum Eye Institute has a tenure-track position available for scientists working in retina research with a desire to utilize high resolution retinal imaging. A strategic goal of the Flaum Eye Institute is to develop and apply innovative new capabilities to study the structure and function of the retina in healthy and diseased eyes. This includes basic research on a number of animal model systems including (but not limited to) mouse and non-human primate systems. Research may also involve human imaging and the ...

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    2. Preoperative biometric measurements with anterior segment optical coherence tomography and prediction of postoperative intraocular lens position

      Preoperative biometric measurements with anterior segment optical coherence tomography and prediction of postoperative intraocular lens position

      The purpose of this study is to evaluate the biometric parameters of crystalline lens components and to find effective factors for predicting postoperative intraocular lens (IOL) position. This retrospective study included 97 eyes from 97 patients with a mean age of 63.00 ± 12.38 (SD) years. The biometric measurements were performed by means of a 3-dimensional optical coherence tomography (3D-OCT) device. Specifically, anterior chamber depth (ACD), aqueous depth (AD), lens thickness (LT), lens meridian parameter (LMP), white-to-white diameters (WTW), anterior segment length (ASL), the anterior part of lens (aLT), and the posterior part of lens (pLT) were measured. Additionally ...

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    3. Examination of Gland Dropout Detected on Infrared Meibography by Using Optical Coherence Tomography Meibography

      Examination of Gland Dropout Detected on Infrared Meibography by Using Optical Coherence Tomography Meibography

      Purpose To elucidate the anatomic details of gland dropout detected on two-dimensional infrared (IR) meibography in cases of dry eye associated with meibomian gland dysfunction (MGD) by using three-dimensional optical coherence tomography (OCT) meibography. Methods In this cross-sectional, observational case series, we enrolled gland dropout detected on IR meibography; the condition was then examined using a real-time swept-source OCT system. Accordingly, a series of 500 raster B-scan OCT images, with the gland dropout site (observed on IR imaging) at the center, were obtained and rendered as three-dimensional volume images. The OCT images were classified based on the anatomic details, including ...

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    4. Epithelium and Bowman’s layer thickness and light scatter in keratoconic cornea evaluated using ultrahigh resolution optical coherence tomography

      Epithelium and Bowman’s layer thickness and light scatter in keratoconic cornea evaluated using ultrahigh resolution optical coherence tomography

      A custom-developed ultrahigh resolution optical coherence tomography with an axial resolution of 1.1 μ m in corneal tissue was used to characterize thickness and light scatter of the epithelium and Bowman’s layer in keratoconic (KC) cornea noninvasively. A 4-mm wide vertical corneal section around the apex in nine KC and eight normal eyes was imaged in vivo . The epithelium and Bowman’s layer were visualized and their thickness profiles were quantified. Scatter was quantified based on the sensitivity normalized mean signal intensity distribution. Average mean thickness of the epithelium and Bowman’s layer in KC eyes was significantly smaller ...

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    5. Micrometer axial resolution OCT for corneal imaging

      Micrometer axial resolution OCT for corneal imaging
      An optical coherence tomography (OCT) for high axial resolution corneal imaging is presented. The system uses 375 nm bandwidth (625 to 1000 nm) from a broadband supercontinuum light source. The system was developed in free space to minimize image quality degradation due to dispersion. A custom-designed spectrometer based on a Czerny Turner configuration was implemented to achieve an imaging depth of 1 mm. Experimentally measured axial resolution was 1.1 μm in corneal tissue and had a good agreement with the theoretically calculated resolution from the envelope of the spectral interference fringes. In vivo imaging was carried out and thin ...
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    6. A novel scanning system for imaging the entire anterior segment of the eye using an anterior segment OCT

      A novel scanning system for imaging the entire anterior segment of the eye using an anterior segment OCT
      The ability to image the entire anterior segment from anterior surface of the cornea to the posterior surface of the lens is crucial for understanding accommodation and the efficacy of accommodative intraocular lenses. A novel scanning system for an anterior segment optical coherence tomography (AS-OCT) system was designed to achieve this goal. In contrast to the traditional telecentric scanning method, this system shines OCT beams close to normal incidence on the ocular surfaces to increase the amount of light scattered back from those surfaces to the system. To achieve normal incidence on all the surfaces using one focusing system, one ...
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    7. A novel scanning method for large scan depth anterior segment OCT

      A novel scanning method for large scan depth anterior segment OCT
      A novel optical scanning method for an anterior segment optical coherence tomography (AS-OCT) system has been described. This method has been designed for imaging the entire anterior segment of the eye (from cornea to posterior surface of the crystalline lens) at a time. The ability to image the entire anterior segment is crucial in understanding the mechanism of human accommodation and the efficacy of accommodative intraocular lenses. In a conventional scanning system the beam is shined straight into the eye parallel to the optical axis. For anterior segment imaging, large lateral scan area leads to an increase in the angle ...
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    8. Simultaneous measurement of tear film dynamics using wavefront sensor and optical coherence tomography

      PURPOSE: To investigate tear film dynamics using simultaneous measurements of ocular aberrations and lower tear meniscus. METHODS: Simultaneous measurements of wavefront aberration and lower tear meniscus were performed for 11 normal eyes and 7 eyes with short tear film break-up time dry eye (SBUT dry eye), which have tear film break-up time shorter than 5 seconds, using a wavefront sensor and an anterior segment optical coherence tomography (OCT). During the measurement, the subjects were instructed to blink every 6 seconds for a total of 30 seconds. From the measured aberration, root mean square (RMS) wavefront error and volume modulation transfer ...
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    1-8 of 8
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    1. (8 articles) University of Rochester
    2. (7 articles) Geunyoung Yoon
    3. (1 articles) Gwangju Institute of Science and Technology
    4. (1 articles) Jannick P. Rolland
    5. (1 articles) Kye-Sung Lee
    6. (1 articles) Jun Geun Shin
    7. (1 articles) Byeong Ha Lee
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    A novel scanning method for large scan depth anterior segment OCT A novel scanning system for imaging the entire anterior segment of the eye using an anterior segment OCT Micrometer axial resolution OCT for corneal imaging Epithelium and Bowman’s layer thickness and light scatter in keratoconic cornea evaluated using ultrahigh resolution optical coherence tomography Examination of Gland Dropout Detected on Infrared Meibography by Using Optical Coherence Tomography Meibography Preoperative biometric measurements with anterior segment optical coherence tomography and prediction of postoperative intraocular lens position Open Rank Tenure Track Faculty Position in Retina Research, University of Rochester, Rochester, NY Postdoctoral opening in optical instrumentation and retinal imaging at University of Illinois at Chicago Detection of intracranial hypertension in children using optical coherence tomography: a systematic review protocol Optical coherence tomography versus intravascular ultrasound for culprit lesion assessment in patients with acute myocardial infarction Insulin-like growth factor-1 levels predict myocardial injury and infarction after elective percutaneous coronary intervention: an optical coherence tomography study Short-term healing response after implantation of the thin-strut, fast-releasing sirolimus-eluting biodegradable polymer-coated Alex Plus stent: optical coherence tomography study