1. Articles from eyeworld.org

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    1. Ophthalmic imaging modalities: a lot of change in 2 years

      Ophthalmic imaging modalities: a lot of change in 2 years

      In the past 2 years, advancements in ophthalmic imaging technologies have made huge strides. According to David Huang, MD, Casey Eye Institute, Oregon Health and Science University, Portland, Oregon, just when you think you’ve hit the ceiling in technology, there is a new breakthrough that exceeds all previous expectations. He made this observation while speaking on “Landmark achievements in new imaging modalities 2016–2018” at the 2018 World Ophthalmology Congress. Such is the case with optical coherence tomography angiography (OCTA), visible light OCT (vis-OCT), and the application of deep learning in ophthalmology, which represent three landmark technological changes that ...

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    2. Viewing retinal disease with the aid of OCT angiography

      Viewing retinal disease with the aid of OCT angiography

      I magine managing some of the leading causes of blindness with the aid of optical coherence tomography (OCT) angiography instead of using the current dye-based technique. Research published in the Proceedings of the National Academy of Sciences indicates that the new OCT angiography could improve the management of many retinal conditions, according to David Huang, MD, Peterson professor of ophthalmology and professor of biomedical engineering, Casey Eye Institute, Oregon Health & Science University (OHSU), Portland. Researchers wanted to highlight all of the different types of microvascular pathologies that can be seen with OCT angiography. They honed in on OCT angiography, which ...

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    3. Technology advances in optical coherence tomography

      Technology advances in optical coherence tomography

      C ompared to the first generation of optical coherence tomography (OCT), the third-generation time-domain (TD) was considered the gold standard—with a resolution of 10 microns, 400 scans/second, and 6 radial scans, “it was pretty amazing in its time,” said Rahul N. Khurana, MD, Northern California Retina Vitreous Associates, Mountain View, Calif. But spectral-domain OCT (SD-OCT) has eclipsed TD-OCT—it’s about 100 times faster and produces closer to 40,000 actual scans, taking resolution down to the 5-micron level. For retina specialists, “the standard of care is really using SD-OCT,” he said, especially when evaluating retinal pathologies like ...

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    4. Ophthalmology at zero gravity

      Ophthalmology at zero gravity

      NASA investigates vision changes that astronauts experience in microgravity T wo hundred and five miles above the Earth, aboard the International Space Station (ISS), astronauts are discovering what happens to the human eye in space. In addition to the muscle atrophy and bone loss that plague astronauts in spaceflight, vision problems are a less recognized, yet no less important, side effect of life at zero gravity. Mitigating these deleterious effects is paramount if humans hope to visit other planets or solar systems in the future, so NASA has begun to use the ISS as a platform for research to better ...

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    5. Detecting corneal bulging with swept-source OCT

      Detecting corneal bulging with swept-source OCT

      C orneal ectasia after LASIK ranks in seriousness to endophthalmitis after cataract surgery. While the severity of each problem differs, these continue to be a significant issue when they occur after their relative surgeries. Ectasia continues to mystify, to some extent. Forme fruste keratoconus, numerous LASIK procedures, and even high myopia are just some of the risk factors for the disease, but nothing predicts with 100% accuracy who will get ectasia. Refractive surgery itself has been known to potentially cause forward protrusion of the posterior cornea, suggesting that minor bulging of the eye happens in some cases. Given the wide ...

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    6. Preoperative OCTs for multifocal patients

      Preoperative OCTs for multifocal patients

      W hen implanting a multifocal IOL (MFIOL), it is vital the patient be a good candidate, so a careful preoperative examination is necessary. This may include optical coherence tomography (OCT) to check for any macular pathology or retina problems. Carl Regillo, MD, Mid Atlantic Retina, Philadelphia; Jeffrey Heier, MD, Ophthalmic Consultants of Boston; and Pravin Dugel, MD, Retinal Consultants of Arizona, Phoenix, spoke about important things to know about a preop examination.

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      Mentions: Optos
    7. Macular OCT imaging in glaucoma

      Macular OCT imaging in glaucoma

      P erimetry has been a staple of glaucoma diagnosis and monitoring since the time of Albrecht von Graefe in the 1850s. The value of perimetry in glaucoma management has long been established, as has its limitations. These include high intra-test and inter-test variability, long test times, low sensitivity in early disease, and a universal dislike for the test by patients because it is tedious, stressful, and difficult to perform. There is substantial unmet need for a better test than the visual field for glaucoma evaluation. We have come to appreciate the remarkable resolution that optical coherence tomography (OCT) provides when ...

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      Mentions: UCLA
    8. Anti-VEGF therapy from the patients perspective

      Anti-VEGF therapy from the patients perspective

      Anti-VEGF (vascular endothelial growth factor) therapy has been as close to a magic bullet as we have seen in therapeutic ophthalmology. No longer does the diagnosis of neovascular age-related macular degeneration (AMD) mean near-certain vision loss—the majority of treated patients preserve stable visual acuity, and significant proportions gain substantial acuity with treatment. Bevacizumab (Avastin, Genentech, South San Francisco), ranibizumab (Lucentis, Genentech), and aflibercept (Eylea, Regeneron Pharmaceuticals, Tarrytown, N.Y.) therapy’s impact extends well beyond AMD as well—this near-panacea is effective in treating macular edema due to diabetes and retinal vein occlusion, can regress anterior segment neovascularization, and ...

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    9. Anterior segment imaging devices

      Anterior segment imaging devices

      G onioscopy—long the gold standard in glaucoma examinations—is admittedly difficult to learn, and as a result may not be used as often in clinical practice as it is during residency. The numerous angle “grading” schemes can be confusing as well. Coupled with the introduction of anterior segment imaging devices, glaucoma specialists now have a variety of tools to use. “When anterior segment imaging became available, it was an emerging, promising technique that produced great images,” said Nathan M. Radcliffe, MD, assistant professor of ophthalmology, New York University, New York. “The ophthalmic community let off the gonioscopy skills a ...

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    10. Swept-source OCT and glaucoma

      Swept-source OCT and glaucoma

      A technology being investigated for use in posterior segment imaging may have a role in glaucoma diagnosis, according to the literature First there was time-domain optical coherence tomography (TD-OCT), then spectral-domain OCT (SD-OCT); now a newer technology—swept-source OCT—may be able to image structures that the previous technologies could not, according to researchers involved in clinical studies of the device. "With swept-source technology, a frequency swept light source and a high speed detector are used to detect the interference signal as a function of time, instead of a spectrometer and camera as in spectral-domain technology," explained James G. Fujimoto ...

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    11. Updates on anterior segment imaging

      Updates on anterior segment imaging

      Technology is advancing the field rapidly—and that's helping researchers and clinicians diagnose corneal disorders more thoroughly and more easily T he ability to quickly diagnose—and then treat just as quickly—diseases such as keratoconus is due in part to the sophisticated imaging devices currently available. Forme fruste keratoconus (FFKC) is "not the same as a topographic pattern of a keratoconus suspect, which is a topographic diagnosis," said Fernando Faria-Correia, MD, refractive surgery research fellow, Storm Eye Institute, and Magill Vision Center, Charleston, S.C. Rather, FFKC is an incomplete or abortive form of keratoconus presenting with a ...

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    12. More knowledge yields better diagnoses

      More knowledge yields better diagnoses

      How anterior segment optical coherence tomography is making it easier to plan treatment strategies There is no doubt in most clinicians' minds that the technological advances witnessed in imaging devices has made diagnosing some abnormalities a bit easier for the anterior segment surgeon. "There's so much more information we can have at our fingertips now, it's incredible," said Steven G. Safran, M.D., in private practice, Lawrenceville, N.J. Among the pathologies more easily identified with anterior segment optical coherence tomography (OCT) are epithelial ingrowth under LASIK flaps, determining residual stromal bed thickness, etc. "Anterior segment OCT is ...

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    13. Using OCT to diagnose retinal disorders

      Using OCT to diagnose retinal disorders

      Figure 1. An epiretinal membrane denoted by the arrow distorts the retinal anatomy and may decrease visionFigure 2. The macular hole seen here through OCT will necessitate immediate surgery to avoid vision lossSource (all): Roberto Bellucci, M.D., and Miriam Cargnoni, O.D. Before the imaging device was popularized, it was next to impossible to diagnose some disorders with any confidence In an era when every premium lens patient not only expects perfect vision but also expects no complications from the surgery, any and every diagnostic tool in a surgeon's armamentarium becomes even more important to weed out the ...

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    14. The software revolution in ophthalmology

      The software revolution in ophthalmology

      Software is eating the world," Netscape co-founder Marc Andreessen wrote in an essay published in The Wall Street Journal in August. He was referring to how software has been transforming major industries from books to music to recruiting—think Amazon, iTunes, and LinkedIn. Software is in everything, from the exploration of oil and gas that fuels our cars and homes, to the navigation functions in our vehicles, to our everyday financial transactions in stores. In Mr. Andreessen's view, healthcare and education are "next up for fundamental software-based transformation." Indeed, in ophthalmology, it is clear that a software revolution has ...

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    15. Adding a new dimension to AMD testing

      Adding a new dimension to AMD testing
      3D computerized test distinguishes wet from dry AMD . The dry case has a central defect that is the same at all contrast levels representing an absolute scotoma Source: Craig Robison, M.D., Wolfgang Fink, Ph.D., and Alfredo Sadun, M.D., Ph.D. For age-related macular degeneration (AMD) patients, a new test dubbed 3D-CTAG can help to differentiate wet from dry cases, according to J. Sebag, M.D., founding director, VMR Institute, Huntington Beach, and professor of clinical ophthalmology, University of Southern California, Los Angeles. Results published in the January issue of the British Journal of Ophthalmology indicated that 3D-CTAG ...
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    16. Telemedicine: Encouraging results for evaluating optic nerve disease

      Telemedicine: Encouraging results for evaluating optic nerve disease

      The potential benefits of an effective telemedicine system in ophthalmology are plentiful. Broad-based applications of telemedicine could greatly enhance screening efforts for potentially blinding conditions such as diabetic retinopathy, macular degeneration, and glaucoma. Telemedicine could help bring subspecialty expertise to small or rural communities, or even to the developing world. A trio of new studies, presented at the annual meeting of the Association for Research in Vision and Ophthalmology in Ft. Lauderdale, Fla., in May 2010, demonstrated a global interest in adopting telemedicine for the evaluation of various optic nerve diseases, including glaucoma.

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    17. Assessing artificial tears for dry eye

      Assessing artificial tears for dry eye

      No clear winner in tear treatment There is no artificial tear yet that is perfect for all dry-eye patients. That's the conclusion that a number of dry-eye specialists make as they continue to try the expanding realm of tear productions available with their patients. "It is difficult to make an objective case that one type of product is superior over another, especially for so-called different types of dry eye," said Michael J. Doughty, Ph.D., professor, Department of Vision Sciences, Glasgow-Caledonian University, Glasgow, Scotland. Dr. Doughty recently co-authored a review article comparing artificial tears. "The overriding issue is what ...

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    18. OCT helps to identify retinoschisis

      OCT helps to identify retinoschisis
      Using a hand-held spectral domain optical coherence tomography (OCT) imaging device may help practitioners to pinpoint sight-threatening changes such as retinoschisis in infants with progressive retinopathy of prematurity (ROP), according to Thomas C. Lee, M.D., associate professor of ophthalmology, University of Southern California, and director, Retina Institute, Children’s Hospital Los Angeles. In a recent study published in the January 2010 issue of Archives of Ophthalmology, investigators found that use of the device helped to identify eyes with sight-threatening retinoschisis. ROP is an all-too-common phenomenon among neonates. “Of children born weighing less than 1250 grams, 10% will develop ROP ...
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      Mentions: Thomas C. Lee
    19. Femto lasers in cataract surgery

      Femto lasers in cataract surgery
      Using lasers to perform certain parts of cataract extraction harkens back to the days when Nd:YAG for posterior capsulotomy was first introduced. These days, the interest in using lasers has increased, as three companies are developing or have brought femtosecond technology to the cataract surgeon. These new lasers have the means of not only removing the cataract, but of creating precise capsulorhexis and treating astigmatism via limbal relaxing incisions. The three companies working on these lasers are: LenSx Lasers (Aliso Viejo, Calif.), LensAR (Winter Park, Fla.), and Optimedica (Santa Clara, Calif.). EyeWorld spoke with the medical monitors or key ...
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    20. OCT-guided femto lasers creates thin flaps

      A study published in the January issue of the Journal of Refractive Surgery concluded that optical coherence tomography (OCT) could be a useful tool in guiding a femtosecond laser. Omid Kermani, M.D., Augenklinik am Neumarkt, Cologne, who also presented the paper at the Lens, Refractive & Wavefront Summit in Alicante, Spain, in March 2009 said that thin-flap keratomileusis is a procedure that minimizes LASIK flap thickness to preserve both the corneal epithelium and the maximum residual stroma. He and his colleagues theorized that OCT could be used to guide the femtosecond laser to create a thin flap. For the study ...
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    21. Delving into glaucoma

      Delving into glaucoma
      How imaging devices and long-used assessments help with glaucoma detection, progression Newer methods to detect glaucoma strike a balance with the tried-and-true but less high-tech methods, a number of ophthalmologists said. Although state-of-the-art imaging methods to detect glaucoma earlier are now commonplace, glaucoma specialists said they don’t want to lose the value of perimetry, gonioscopy, tonometry, visual fields, and other detection tests. For now, high-tech versus low-tech detection methods are used hand in hand. “The most common tests within glaucoma are perimetry and scanning computerized ophthalmic diagnostic imaging,” said Kevin J. Corcoran, C.O.E., C.P.C., F ...
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    22. Corneal therapeutics with the femtosecond laser

      Corneal therapeutics with the femtosecond laser
      One of the approved therapeutic uses of the femtosecond laser is for astigmatic keratotomy (AK) to treat either naturally occurring or post-surgical astigmatism. “One of the ways that this laser is an advantage is that the cuts are very uniform and you can program them to be a certain depth,” Dr. Yoo said. “We’ve looked at these AK cuts on OCT (optical coherence tomography) post-operatively trying to see how close we are to the desired depth, and it looks as if the OCT measurements are very close to what we want them to be.”
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    23. Evaluating the anterior chamber angle with OCT

      Evaluating the anterior chamber angle with OCT
      Evaluating the anterior chamber angle is vexing for many clinicians due largely to the subjectivity of the task. Is that angle narrow? Is it occludable? There are potential consequences to making the wrong call, from an unnecessary procedure to a full-blown attach of angle-closure glaucoma. Nowhere is this issue more important than in Asia, where angle-closure glaucoma represents a much larger proportion of all glaucoma than in the United States. “Gonioscopy is the current reference standard to detect angle closure,” said Arun Narayanaswamy, M.D., Singapore Eye Research Institute, Singapore. “However, subjective influences govern its interpretation.” Lisandro Sakata, M.D ...
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    24. Good OCT results from Dsaek, phaco combined procedure

      Good OCT results from Dsaek, phaco combined procedure
      Anterior segment optical coherence tomography (OCT) imaging of patients undergoing Descemet stripping automated endothelial keratoplasty combined with phacoemulsification in patients with cataract and Fuchs endothelial dystrophy found healthy results after one year. The study was published in the August 2008 issue of the Archives of Ophthalmology. This small study by researchers in the Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami retrospectively reviewed the mean 14-month results of 12 eyes of 11 patients that underwent the procedure. Their findings, which echo the experience of the small but growing number of surgeons undertaking the ...
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    1-24 of 32 1 2 »
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