Karyn Jonas

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PURPOSE To examine the influence of fluorescein angiography (FA) on the diagnosis and management of retinopathy of prematurity (ROP). DESIGN Prospective cohort study. PARTICIPANTS Nine recognized ROP experts (3 pediatric ophthalmologists and 6 retina specialists) interpreted 32 sets (16 color fundus photographs and 16 color fundus photographs paired(More)
PURPOSE To examine the usefulness of fluorescein angiography (FA) in identifying the macular center and diagnosis of zone in patients with retinopathy of prematurity (ROP). DESIGN Validity and reliability analysis of diagnostic tools. METHODS Thirty-two sets (16 color fundus photographs and 16 color fundus photographs paired with the corresponding FA(More)
PURPOSE We developed and evaluated the performance of a novel computer-based image analysis system for grading plus disease in retinopathy of prematurity (ROP), and identified the image features, shapes, and sizes that best correlate with expert diagnosis. METHODS A dataset of 77 wide-angle retinal images from infants screened for ROP was collected. A(More)
Information systems managing image-based data for telemedicine or clinical research applications require a reference standard representing the correct diagnosis. Accurate reference standards are difficult to establish because of imperfect agreement among physicians, and discrepancies between clinical vs. image-based diagnosis. This study is designed to(More)
IMPORTANCE Published definitions of plus disease in retinopathy of prematurity (ROP) reference arterial tortuosity and venous dilation within the posterior pole based on a standard published photograph. One possible explanation for limited interexpert reliability for a diagnosis of plus disease is that experts deviate from the published definitions. (More)
PURPOSE To characterize the frequency of and clinical indications for which experts treat retinopathy of prematurity (ROP) milder than type 1 disease, the recommended threshold for treatment from established consensus guidelines. DESIGN Descriptive analysis. METHODS setting: Multicenter. STUDY POPULATION A database of 1444 eyes generated prospectively(More)
Retinopathy of prematurity (ROP) is a disease affecting low birth-weight infants and is the major cause of childhood blindness. Although accurate diagnosis is important, there is a high variability among expert decisions mostly due to subjective thresholds. Existing work focused on automated diagnosis of ROP. In this study, we construct a continuous(More)
  • Karyn Jonas, R V Paul Chan
  • Asia-Pacific journal of ophthalmology
  • 2013
To the Editor: Shah et al 1 report the results of a study looking at the ability of nurses in identifying what the authors describe as ‘‘referral warranted’’ retinopathy of prematurity (ROP). They compare the diagnostic interpretations of digital images by nurses with an experienced ROP specialist. Although the study does not have a large sample size and is(More)
PURPOSE To determine the feasibility and safety of bilateral simultaneous vitreoretinal surgery in pediatric patients. DESIGN International, multicenter, interventional, retrospective case series. PARTICIPANTS Patients 17 years of age or younger from 24 centers worldwide who underwent immediate sequential bilateral vitreoretinal surgery (ISBVS)-defined(More)
PURPOSE To evaluate a tele-education system developed to improve diagnostic competency in retinopathy of prematurity (ROP) by ophthalmologists-in-training in Mexico. DESIGN Prospective, randomized cohort study. PARTICIPANTS Fifty-eight ophthalmology residents and fellows from a training program in Mexico consented to participate. Twenty-nine of 58(More)