1. Articles from Choun-Ki Joo

    1-9 of 9
    1. Accuracy of swept-source optical coherence tomography based biometry for intraocular lens power calculation: a retrospective cross–sectional study

      Accuracy of swept-source optical coherence tomography based biometry for intraocular lens power calculation: a retrospective cross–sectional study

      Background To evaluate the accuracy of biometric measurements by a swept-source optical coherence tomography (SS–OCT) based biometry for intraocular lens (IOL) power calculation. Methods This retrospective observational study enrolled 431 patients undergoing cataract surgery. The charts were reviewed to investigate the failure rate of axial length (AL) measurement of the SS–OCT biometer, partial coherence interferometry (PCI), and A–scan ultrasonography (US) according to cataract type and severity. AL and keratometry in 164 eyes with the same IOL inserted were measured using the SS–OCT biometer, PCI, and A–scan US. The SRK/T formula was used to calculate ...

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    2. Predictive accuracy of partial coherence interferometry and swept-source optical coherence tomography for intraocular lens power calculation

      Predictive accuracy of partial coherence interferometry and swept-source optical coherence tomography for intraocular lens power calculation

      The purpose of this study is to compare the predictive accuracy of intraocular lens (IOL) calculations made with partial coherence interferometry (PCI, IOLMaster, version 5) and swept-source optical coherence tomography (SS-OCT, Argos). Axial length (AL), mean keratometry value (K), and anterior chamber depth (ACD) were obtained using PCI and SS-OCT optical biometers. Intraocular lens (IOL) power calculations were made using the Barret-Universal II, Haigis, Hoffer Q, SRK/T, and T2 formulas and compared the predictive accuracy between biometers. In 153 eyes (153 patients), axial length measurements made with PCI (24.65 ± 2.35 mm) and SS-OCT (24.62 ± 2.29 ...

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    3. Lamellar keratoplasty using position-guided surgical needle and M-mode optical coherence tomography

      Lamellar keratoplasty using position-guided surgical needle and M-mode optical coherence tomography

      Deep anterior lamellar keratoplasty (DALK) is an emerging surgical technique for the restoration of corneal clarity and vision acuity. The big-bubble technique in DALK surgery is the most essential procedure that includes the air injection through a thin syringe needle to separate the dysfunctional region of the cornea. Even though DALK is a well-known transplant method, it is still challenged to manipulate the needle inside the cornea under the surgical microscope, which varies its surgical yield. Here, we introduce the DALK protocol based on the position-guided needle and M-mode optical coherence tomography (OCT). Depth-resolved 26-gage needle was specially designed, fabricated ...

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    4. 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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    5. Assessment of Lens Center Using Optical Coherence Tomography, Magnetic Resonance Imaging, and Photographs of the Anterior Segment of the Eye

      Assessment of Lens Center Using Optical Coherence Tomography, Magnetic Resonance Imaging, and Photographs of the Anterior Segment of the Eye

      Purpose : To determine the nearest marker for evaluating the center of the crystalline lens using optical coherence tomography (OCT), magnetic resonance imaging (MRI), and photographs. Methods : Optical coherence tomography scans of human eyes were obtained in vivo during femtosecond laser-assisted cataract surgery. From axial and sagittal images, the distance of the angle center (AC) and pupil center (PC) from the scanned capsule center (SCC) was calculated. From pre- and postoperative photographs, the distance of the PC and limbal center (LC) from the intraocular lens (IOL) center was calculated, and distance between each center on the lens equatorial plane was compared ...

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    6. System For Calculating Center Of Anterior Capsule And Method Therefor

      System For Calculating Center Of Anterior Capsule And Method Therefor

      A method for calculating the center of the anterior capsule includes the steps of: photographing the eyeball of a patient with an optical coherence tomography; generating a 3-dimensional image and coordinates based on the data obtained by the optical coherence tomography; photographing the eyeball of the patient to produce an eyeball image; and matching the 3-dimensional image and coordinates to the eyeball image so as to calculate the center of the anterior capsule of the patient. A system for calculating the center of the anterior capsule includes: an optical coherence tomography apparatus for photographing the eyeball of a patient with ...

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    7. In Vivo 3D Meibography of the Human Eyelid Using Real Time Imaging Fourier-Domain OCT

      In Vivo 3D Meibography of the Human Eyelid Using Real Time Imaging Fourier-Domain OCT

      Recently, we reported obtaining tomograms of meibomian glands from healthy volunteers using commercial anterior segment optical coherence tomography (AS-OCT), which is widely employed in clinics for examination of the anterior segment. However, we could not create 3D images of the meibomian glands, because the commercial OCT does not have a 3D reconstruction function. In this study we report the creation of 3D images of the meibomian glands by reconstructing the tomograms of these glands using high speed Fourier-Domain OCT (FD-OCT) developed in our laboratory. This research was jointly undertaken at the Department of Ophthalmology, Seoul St. Mary's Hospital (Seoul ...

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    8. Novel Noncontact Meibography With Anterior Segment Optical Coherence Tomography: Hosik Meibography

      Novel Noncontact Meibography With Anterior Segment Optical Coherence Tomography: Hosik Meibography

      Purpose: To present a novel noncontact meibography system with anterior segment optical coherence tomography (OCT), which is widely used in clinics for the anterior segment (cornea, anterior chamber angle, etc.), and compare the results with preexisting infrared meibography. Methods: This research was carried out at the Seoul St Mary's Hospital with 2 volunteers. Preexisting infrared meibography was performed on the subjects, and photographs of the meibomian gland were taken again with the anterior segment OCT. With the anterior segment OCT, a tomogram of the meibomian gland could be taken and a picture of the whole meibomian gland could be ...

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    9. Early changes in corneal edema following torsional phacoemulsification using anterior segment optical coherence tomography and Scheimpflug photography

      Early changes in corneal edema following torsional phacoemulsification using anterior segment optical coherence tomography and Scheimpflug photography
      Purpose To assess corneal edema after torsional phacoemulsification using anterior segment optical coherence tomography (AS-OCT) and Scheimpflug photography (Pentacam). Methods Seventy-six eyes with cataract surgery were randomized into 2 groups: a 2.2 mm micro-coaxial incision group (n = 37) and a 2.8 mm standard incision group (n = 39). Patients were examined preoperatively and at 1 day, 1 week and 1 month postoperatively. Incision architecture and pachymetry at the wound level were measured by AS-OCT. The corneal volume within 3.0 and 10.0 mm circles of the cornea was measured using Pentacam. Results The cumulative dissipated energy (CDE) was ...
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    1-9 of 9
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  2. Topics in the News

    1. (2 articles) Gwangju Institute of Science and Technology
    2. (2 articles) Jun Geun Shin
    3. (2 articles) Byeong Ha Lee
    4. (2 articles) Tae Joong Eom
    5. (1 articles) University of Ulsan
    6. (1 articles) University of Rochester
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    Early changes in corneal edema following torsional phacoemulsification using anterior segment optical coherence tomography and Scheimpflug photography Novel Noncontact Meibography With Anterior Segment Optical Coherence Tomography: Hosik Meibography In Vivo 3D Meibography of the Human Eyelid Using Real Time Imaging Fourier-Domain OCT System For Calculating Center Of Anterior Capsule And Method Therefor Assessment of Lens Center Using Optical Coherence Tomography, Magnetic Resonance Imaging, and Photographs of the Anterior Segment of the Eye Examination of Gland Dropout Detected on Infrared Meibography by Using Optical Coherence Tomography Meibography Lamellar keratoplasty using position-guided surgical needle and M-mode optical coherence tomography Predictive accuracy of partial coherence interferometry and swept-source optical coherence tomography for intraocular lens power calculation Accuracy of swept-source optical coherence tomography based biometry for intraocular lens power calculation: a retrospective cross–sectional study Changes in Amblyopia Using Optical Coherence Tomography Integrated optical system with photonic integrated circuit including coherent optical receiver and optical phased array Surface emitting laser, information acquiring apparatus, imaging apparatus, laser array, and method of manufacturing surface emitting laser