1. Articles from reviewofoptometry.com

  2. 1-10 of 10
    1. SD-OCT Detects Elusive Epiretinal Membrane

      SD-OCT Detects Elusive Epiretinal Membrane

      Researchers from Spain recommend practitioners perform spectral-domain optical coherence tomography (SD-OCT) before cataract surgery because fundus examination might not detect an epiretinal membrane. In their study, the membrane’s presence in the macular area with no foveal alterations was the only risk factor for pseudophakic cystoid macular edema (CME) and may implicate a previous subclinical damage or increased predisposition to both conditions. In a prospective cohort study, 112 patients underwent SD-OCT within one week pre-op and three months post-op. CME incidence in the cohort was 11.6% (13 eyes), all of which were diagnosed at one month, and seven eyes ...

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    2. Head Tilt Significantly Affects OCT Image Orientation

      Head Tilt Significantly Affects OCT Image Orientation

      Head tilt can impact the orientation of posterior pole images. Knowing this, a team of Canadian researchers conducted a study of 56 healthy patients to determine the effect of head tilt on image orientation measured by the fovea-Bruch’s membrane opening (FoBMO) angle with optical coherence tomography (OCT) imaging. The researchers measured head tilt by affixing a smartphone with a built-in gyroscope to each patient's head. They then performed OCT imaging in both eyes at 0°, 5° and 10° of head tilt in the direction of the imaged eye (ipsilateral head tilt) and in the opposite direction (contralateral head ...

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    3. OCT Matches or Beats FA

      OCT Matches or Beats FA

      A team of researchers discovered that spectral-domain optical coherence tomography (OCT) as an initial diagnostic test has a sensitivity and a specificity similar to fluorescein angiography (FA) in diagnosing choroidal neovascularization (CNV) in age-related macular degeneration. Both tests were combined color fundus photography. The study evaluated 148 eyes of 148 patients at least 50 years of age who were referred for suspicious recent-onset CNV. The team found that the sensitivities of OCT and FA were 90.9%. Type 2 CNV was diagnosed in 98% to 100% of cases using both modalities, while Type 1 CNV was diagnosed in 82.9 ...

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    4. OCT-A Proposed as Alternative to Iris Angiography

      OCT-A Proposed as Alternative to Iris Angiography

      A recent prospective study tested whether optical coherence tomography angiography (OCT-A) was useful in appraising anterior segment ischemia (ASI), a rare but potentially vision-threatening complication of strabismus surgery. 1 Researchers believe the invasive and time-consuming nature and potential adverse effects limit the utility of indocyanine green angiography and fluorescein angiography, the current standard for assessing anterior segment circulation. The study prospectively recruited nine adults undergoing strabismus surgery on at least one vertical muscle and evaluated images of 10 eyes. Indocyanine green angiography and OCT-A of the iris were taken preoperatively and one day post-op. The researchers found a 2% reduction ...

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    5. DME Microaneurysms Detected More on FA than OCT-A

      DME Microaneurysms Detected More on FA than OCT-A

      In diabetic macular edema (DME) patients, optical coherence tomography angiography (OCT-A) may detect fewer microaneurysms than fundus fluorescein angiography (FA), likely due to leakage and retinal thickening, new research reports. Investigators examined OCT-A and FA images of 31 eyes of 24 participants and graded them for microaneurysms. They found just 58% of microaneurysms detected on FA were also visible on OCT-A. Additionally, microaneurysms with focal leakage in a thickened retinal area were detected more frequently on OCT-A than non-leaking microaneurysms in non-thickened retinal areas. Most microaneurysms on OCT-A were seen in the intermediate (23%) and deep capillary plexus (22%). Of ...

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    6. Think OCT for Measuring Strabismus

      Think OCT for Measuring Strabismus

      In an effort to better automate strabismus evaluations, which are prone to error when done manually, researchers in the United Kingdom used binocular optical coherence tomography (OCT) to measure the size of strabismus, with positive results. The study included 15 patients with strabismus and 15 controls, and evaluated the findings of both automated anterior segment imaging and alternating prism cover test (APCT). The researchers found OCT imaging “correctly revealed the type and direction of the deviation in all 15 participants with strabismus, including horizontal and vertical deviations,” and the imaging was strongly correlated with the APCT measurement. APCT results also ...

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    7. SS-OCT Better Than Scheimpflug for Corneal Thickness

      SS-OCT Better Than Scheimpflug for Corneal Thickness

      Swept-source Fourier-domain optical coherence tomography (SS-OCT) yields better corneal thickness measurements than the Scheimpflug camera for patients with Fuch's endothelial corneal dystrophy (FECD) or an endothelial transplant, a recent study found. Researchers from Spain compared repeatability and reproducibility coefficients of the two imaging modalities between 36 control eyes, 35 FECD eyes, 30 FECD eyes with corneal edema, 25 eyes after Descemet stripping automated endothelial keratoplasty and 29 eyes that had Descemet’s membrane endothelial keratoplasty. While both systems showed high corneal thickness reproducibility and repeatability, SS-OCT results were higher and more precise across patient groups—often significantly so. “The ...

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    8. OCT-A Pinpoints Irregularities in Best Disease

      OCT-A Pinpoints Irregularities in Best Disease

      A team of researchers found optical coherence tomography angiography (OCT-A) is a useful diagnostic tool in assessing eyes with Best disease and associated choroidal neovascularization (CNV). In a study published in the British Journal of Ophthalmology , investigators used OCT-A to find eyes with Best disease had abnormal foveal avascular zones (FAZ), patchy vascularity loss in the superficial and deep layers of the retina and capillary dropout with a hyporeflective center in the choriocapillary layer. Additionally, the investigators found OCT-A is superior to fluorescein angiography (FA) in measuring CNV. The prospective observational study included 19 eyes of 10 patients with Best ...

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    9. OCT Reveals Ocular Changes in Astronauts

      OCT Reveals Ocular Changes in Astronauts

      Researchers recently found that astronauts have disc edema-like changes in eye structure after returning to Earth from the International Space Station (ISS). The study looked at morphological changes in the optic nerve head and surrounding tissues in 15 astronauts after they completed a roughly six-month mission aboard the ISS. The results were compared with 43 healthy control patients with no history of exposure to microgravity in space. After analyzing optical coherence tomography (OCT) data for the astronauts collected before and after the mission, the researchers found three major changes in eye structure. Before the flight, the astronauts presented with recessed ...

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    10. Understanding Today's State of the Art OCT Technology

      Understanding Today's State of the Art OCT Technology

      Goal Statement: With optical coherence tomography techniques expanding, optometrists need to know when to apply which modalities to which patients. This article explains how OCT—with an emphasis on enhanced depth imaging, swept source technology and OCT angiography—can be applied clinically to diagnose and monitor macular disease, diabetic retinopathy and glaucoma, among others.

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    1-10 of 10
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