1. Articles from Douglas D. Koch

    1-11 of 11
    1. Evaluation of the Repeatability and Reproducibility of Corneal Epithelial Thickness Mapping for a 9-mm Zone Using Optical Coherence Tomography

      Evaluation of the Repeatability and Reproducibility of Corneal Epithelial Thickness Mapping for a 9-mm Zone Using Optical Coherence Tomography

      Purpose: To evaluate the repeatability and between-machine/operator reproducibility of optical coherence tomography (RTVue-XR) for mapping corneal epithelial thickness (ET) and corneal thickness (CT) over a 9-mm zone. Methods: In 5 groups of eyes (normal, contact lens, dry eye, post-LASIK/PRK, and keratoconus), corneal ET and CT were evaluated in 25 areas in the following 4 regions: 1) 1 central zone within 0 to 2.0 mm diameter, 2) 8 paracentral zones from 2.0 to 5.0 mm diameter, 3) 8 midperipheral zones from 5.0 to 7.0 mm diameter, and 4) 8 peripheral zones from 7.0 ...

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    2. Evaluation of crystalline lens and intraocular lens tilt using a swept-source optical coherence tomography biometer

      Evaluation of crystalline lens and intraocular lens tilt using a swept-source optical coherence tomography biometer

      Purpose To evaluate crystalline lens and intraocular lens (IOL) tilt using a swept-source optical coherence tomography (SS-OCT) biometer (IOLMaster 700). Setting Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. Design Retrospective case series. Methods The study patients were evaluated for 1) repeatability of the crystalline lens tilt measurement, 2) preoperative crystalline lens and postoperative IOL tilt in right eyes, 3) mirror symmetry between right eyes and left eyes, 4) the correlation between preoperative crystalline lens and postoperative IOL tilt, and 5) the correlation between the magnitude of lens tilt and ocular parameters. Results The study comprised 333 patients ...

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    3. Evaluation of Femtosecond Laser Versus Manual Clear Corneal Incisions in Cataract Surgery Using Spectral-Domain Optical Coherence Tomography

      Evaluation of Femtosecond Laser Versus Manual Clear Corneal Incisions in Cataract Surgery Using Spectral-Domain Optical Coherence Tomography

      PURPOSE: To investigate the wound healing changes of clear corneal incisions performed with a femtosecond laser or a steel bevel knife in cataract surgery using spectral-domain optical coherence tomography. METHODS: Prospectively, consecutive patients undergoing either femtosecond laser–assisted cataract surgery (femtosecond laser group) using the LenSx laser (Alcon Laboratories, Inc., Fort Worth, TX) or traditional cataract surgery using steel blades (control group) were enrolled. The incidence of posterior wound gape, Descemet's membrane detachment, posterior wound retraction, and the inner and outer corneal incision thicknesses were assessed. RESULTS: Compared to the control group, the femtosecond laser group had significantly lower ...

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    4. Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography

      Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography

      Purpose To use optical coherence tomography (OCT) to evaluate the femtosecond laser intrastromal incisions made during cataract surgery to reduce corneal astigmatism. Design Retrospective case series. Participants Seventy-seven eyes of 77 patients. Methods Paired intrastromal incisions were created using the Catalys femtosecond laser (Abbott Medical Optics, Inc., Santa Ana, CA). The planned intrastromal incision parameters were 20% uncut anterior, 20% uncut posterior, midpoint depth of 50%, and 90° side cut angle. Optical coherence tomography scans were obtained 3 weeks or more after surgery to assess these 4 parameters, and actual values were compared with intended values. Main Outcome Measures Percentages ...

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    5. Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography

      Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography

      Purpose To use optical coherence tomography (OCT) to evaluate the femtosecond laser intrastromal incisions made during cataract surgery to reduce corneal astigmatism. Design Retrospective case series. Participants Seventy-seven eyes of 77 patients. Methods Paired intrastromal incisions were created using the Catalys femtosecond laser (Abbott Medical Optics, Inc., Santa Ana, CA). The planned intrastromal incision parameters were 20% uncut anterior, 20% uncut posterior, midpoint depth of 50%, and 90° side cut angle. Optical coherence tomography scans were obtained 3 weeks or more after surgery to assess these 4 parameters, and actual values were compared with intended values. Main Outcome Measures Percentages ...

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    6. Comparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy

      Comparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy

      Purpose : To evaluate the accuracy of the optical coherence tomography–based (OCT formula) and Barrett True K (True K) intraocular lens (IOL) calculation formulas in eyes with previous radial keratotomy (RK). Methods : In 95 eyes of 65 patients, using the actual refraction following cataract surgery as target refraction, the predicted IOL power for each method was calculated. The IOL prediction error (PE) was obtained by subtracting the predicted IOL power from the implanted IOL power. The arithmetic IOL PE and median refractive PE were calculated and compared. Results : All formulas except the True K produced hyperopic IOL PEs at 1 ...

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    7. Repeatability of Corneal Epithelial Thickness Measurements Using Fourier-Domain Optical Coherence Tomography in Normal and Post-LASIK Eyes

      Repeatability of Corneal Epithelial Thickness Measurements Using Fourier-Domain Optical Coherence Tomography in Normal and Post-LASIK Eyes

      Purpose: To evaluate the repeatability of corneal epithelial thickness (ET) and corneal thickness (CT) measurements in normal eyes and laser in situ keratomileusis (LASIK)-treated eyes using optical coherence tomography (RTVue system). Methods: In 35 right eyes of 35 normal subjects and 45 right eyes of 45 subjects who underwent a myopic LASIK, corneal ET and CT were evaluated in 17 areas: (1) 1 central zone within a 0- to 2.0-mm diameter, (2) 8 paracentral zones from a 2.0- to 5.0-mm diameter, and (3) 8 peripheral zones from a 5.0- to 6.0-mm diameter. The repeatability ...

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    8. OPTICAL COHERENCE TOMOGRAPHY–BASED CORNEAL POWER MEASUREMENT AND INTRAOCULAR LENS POWER CALCULATION FOLLOWING LASER VISION CORRECTION (AN AMERICAN OPHTHALMOLOGICAL SOCIETY THESIS)

      OPTICAL COHERENCE TOMOGRAPHY–BASED CORNEAL POWER MEASUREMENT AND INTRAOCULAR LENS POWER CALCULATION FOLLOWING LASER VISION CORRECTION (AN AMERICAN OPHTHALMOLOGICAL SOCIETY THESIS)

      power in cataract surgeries after laser vision correction. Methods: Patients with previous myopic laser vision corrections were enrolled in this prospective study from two eye centers. Corneal thickness and power were measured by Fourier-domain OCT. Axial length, anterior chamber depth, and automated keratometry were measured by a partial coherence interferometer. An OCT-based IOL formula was developed. The mean absolute error of the OCT-based formula in predicting postoperative refraction was compared to two regression-based IOL formulae for eyes with previous laser vision correction. Results: Forty-six eyes of 46 patients all had uncomplicated cataract surgery with monofocal IOL implantation. The mean arithmetic ...

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    9. Intraocular lens power calculation after previous myopic laser vision correction based on corneal power measured by Fourier-domain optical coherence tomography

      Intraocular lens power calculation after previous myopic laser vision correction based on corneal power measured by Fourier-domain optical coherence tomography

      Purpose To use Fourier-domain optical coherence tomography (OCT) to measure corneal power and calculate intraocular lens (IOL) power in cataract surgeries after laser vision correction. Setting Doheny Eye Institute, Los Angeles, California, and Cullen Eye Institute, Houston, Texas, USA. Design Prospective comparative case series. Methods Patients with previous myopic laser vision correction who had monofocal IOL implantation were enrolled. A Fourier-domain OCT system was used to measure corneal power and pachymetry. Axial length and anterior chamber depth were measured with partial coherence biometry. An OCT-based IOL formula was developed, and the mean absolution error (MAE) of postoperative refraction was compared ...

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    10. Healing changes in clear corneal cataract incisions evaluated using Fourier-domain optical coherence tomography

      Healing changes in clear corneal cataract incisions evaluated using Fourier-domain optical coherence tomography

      Purpose To evaluate the long-term wound-healing changes in clear corneal cataract incisions using Fourier-domain optical coherence tomography (OCT). Setting Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. Design Case series. Methods Multiple OCT images were obtained in consecutive eyes that had phacoemulsification 1 day to 180 months previously. The incision midpoint was measured with OCT. The presence of Descemet membrane detachment, posterior wound gape, and posterior wound retraction was assessed. The depth of wound retraction along the incision and the radial length of the incision were measured. The percentage of wound retraction relative to radial incision length was ...

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    11. Intraocular lens power calculation after myopic and hyperopic laser vision correction using optical coherence tomography

      Intraocular lens power calculation after myopic and hyperopic laser vision correction using optical coherence tomography

      Purpose To use optical coherence tomography (OCT) to measure corneal power and calculate intraocular lens (IOL) power in cataract surgeries after myopic and hyperopic laser vision correction (LVC). Methods Patients with previous LVC were enrolled in this prospective study at two centers (Doheny Eye Institute, Los Angeles, CA, USA and Cullen Eye Institute, Houston, TX, USA). Corneal power was measured with a Fourier-domain OCT system. The intravisit repeatability of OCT corneal power measurement was evaluated by the pooled standard deviation of repeat scans. Axial length, anterior chamber depth, and automated keratometry were measured with the IOLMaster. An OCT-based IOL formula ...

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    1-11 of 11
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    1. (7 articles) Baylor College of Medicine
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    Intraocular lens power calculation after myopic and hyperopic laser vision correction using optical coherence tomography Healing changes in clear corneal cataract incisions evaluated using Fourier-domain optical coherence tomography Intraocular lens power calculation after previous myopic laser vision correction based on corneal power measured by Fourier-domain optical coherence tomography OPTICAL COHERENCE TOMOGRAPHY–BASED CORNEAL POWER MEASUREMENT AND INTRAOCULAR LENS POWER CALCULATION FOLLOWING LASER VISION CORRECTION (AN AMERICAN OPHTHALMOLOGICAL SOCIETY THESIS) Repeatability of Corneal Epithelial Thickness Measurements Using Fourier-Domain Optical Coherence Tomography in Normal and Post-LASIK Eyes Comparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography Evaluation of Femtosecond Laser Versus Manual Clear Corneal Incisions in Cataract Surgery Using Spectral-Domain Optical Coherence Tomography Evaluation of crystalline lens and intraocular lens tilt using a swept-source optical coherence tomography biometer Combining Deep Learning With Optical Coherence Tomography Imaging to Determine Scalp Hair and Follicle Counts Efficacy and Safety of Laser‐Assisted Combination Chemotherapy: An Explorative Imaging‐Guided Treatment With 5‐Fluorouracil and Cisplatin for Basal Cell Carcinoma