Genetic Link Between Corneal Thickness and Risk of Glaucoma

MedicalResearch.com Interview with:

Eldon E. Geisert, PhD Professor of Ophthalmology Emory School of Medicine

Dr. Geisert

Eldon E. Geisert, PhD
Professor of Ophthalmology
Emory School of Medicine

MedicalResearch.com: What is the background for this study? What are the main findings?

Response: In the late 1990s a group of doctors began a study of glaucoma patients to determine if there were phenotypes that are predictive for developing glaucoma.

In this Ocular Hypertension Treatment Study (OHTS) one of the highly correlated ocular traits was central corneal thickness (CCT). The early clinical studies found that people with thinner corneas were at a higher risk of developing glaucoma. In two large studies, examining thousands of people a number of genes were identified that were risk factors for glaucoma or that controlled CCT in humans. In both cases the identified genes accounted for less than 10% of the genetic risk for glaucoma and less than for 10% of the genetic control for CCT. There was little data linking the genetic control of CCT to the glaucoma risk.

Our group has taken an indirect approach to the question, using well-defined mouse genetic system to identify genes modulating CCT and then interrogating human glaucoma data to determine if these genes are associated with glaucoma risk.   Continue reading

Unnecessary Routine Preoperative Cataract Testing Costs Medicare Millions

MedicalResearch.com Interview with:
Catherine L. Chen, MD, MPH

Assistant Professor
UCSF Department of Anesthesia & Perioperative Care

MedicalResearch.com: What is the background for this study? What are the main findings?

Response: Routine preoperative medical testing (such as common laboratory tests looking at a patient’s blood cell counts and kidney function, or cardiac tests like an EKG) are not recommended in patients undergoing cataract surgery, but these tests still occur quite frequently among Medicare cataract surgery patients because these patients tend to be older and sicker than the general population. In the past, researchers have used a 30-day window counting backwards from the date of surgery to determine whether a given test should be categorized as a routine preoperative test. However, we know that testing often takes place outside this window and therefore, the frequency and cost of routine preoperative medical testing has generally been underreported.

In our study, we used a new method to figure out how to determine the start of the routine preoperative testing period. In cataract patients, ocular biometry is a diagnostic test that is performed in anticipation of cataract surgery, and this test is only performed in cataract patients who will be having cataract surgery in the near future. For each patient, we calculated the elapsed time between the ocular biometry and cataract surgery dates to get a better idea of when to start looking for unnecessary routine preoperative testing. Our goal was to identify all the routine preoperative medical testing that occurs once the decision has been made to operate and better estimate the cost to Medicare of this unnecessary testing.

In a previous study that we published in the New England Journal of Medicine, we reported a significant spike in the rate of routine preoperative medical testing that occurs in the 30 days before surgery compared to the baseline rate of testing. In our current study, we discovered that there is a second spike in testing that occurs in the 30 days after ocular biometry. In fact, even if you exclude the testing that takes place during the 30 days before surgery, there is still a 41% increase in testing rates during the interval between ocular biometry and cataract surgery over the baseline rate of testing. In addition, we found that the cost of routine preoperative testing was 47% higher when looking at the entire biometry to surgery timeframe compared to testing that occurs just in the 30 days before surgery.

We estimate that the cost to Medicare of all of this unnecessary testing approaches $45.4 million annually. Continue reading

Tunable Lens Allows Detailed Imaging of Entire Eye

MedicalResearch.com Interview with:

Ireneusz Grulkowski, PhD Assistant Professor Bio-Optics & Optical Engineering Lab Institute of Physics Nicolaus Copernicus University

Dr. Grulkowski

Ireneusz Grulkowski, PhD
Assistant Professor
Bio-Optics & Optical Engineering Lab
Institute of Physics
Nicolaus Copernicus University

MedicalResearch.com: What is the background for this study?

Response: The ophthalmic diagnostics has undergone a revolution over the last 30 years. The access to new modalities allowed to understand the process of development of different eye diseases of the retina and the anterior segment. In particular, optical coherence tomography (OCT) demonstrated the feasibility in visualization of microarchitecture of the ocular tissues. However, most of the ophthalmic equipment is dedicated either to imaging the anterior segment of the eye (e.g. the cornea) or to retinal imaging. This is due to the fact that the eye is composed of the elements, such as the cornea and the lens, that refract the light.

In this report, we wanted to address that challenge. We compensated the refractive power of the eye by the application of the tunable lens. The focus tunable lens is the example of active optical element that changes its focal distance with the applied electric current.

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LUXTURNA Proves Effectiveness of Single Gene Therapy To Cure Rare Cause of Blindness

MedicalResearch.com Interview with:

Dr. Stephen M. Rose, PhD Chief Research Officer Foundation Fighting Blindness

Foundation Fighting Blindness

Dr. Stephen Rose PhD
Chief Research Officer
Foundation Fighting Blindness (FFB)

Dr. Rose comments on the announcement of the FDA approval of voretigene neparvovec (LUXTURNA™) gene therapy for inherited blindness due to mutations in the RPE65 gene.

What is the background for this announcement? What were the main findings from the study?

Response: While it has been 30 years since the RPE65 gene was identified as causing Leber’s Congenital Amaurosis, this shows that it is possible to have an effective gene therapy for an inherited disease. As the first gene therapy for the eye or for an inherited disease, LUXTURNA is a historic milestone in the search for cures for all inherited retinal diseases (IRDs). As a one-time gene therapy, LUXTURNA will not only be life-changing for patients with vision loss due to mutations in the RPE65 gene, it also provides critical momentum for gene therapies – for the eye and other diseases – now in the clinic.  Continue reading

Retinopathy in Premature Infants: Low Dose Ranibizumab May Be Effective Without Systemic Side Effects

MedicalResearch.com Interview with:

Prof. Dr. Andreas Stahl
Geschäftsführender Oberarzt
Leiter Arbeitsgruppe Angiogenese
Universitätsaugenklinik Freiburg | University Eye Hospital Freiburg
Freiburg, Germany

MedicalResearch.com: What is the background for this study?

Response: Retinopathy of prematurity (ROP) is a sight-threatening disease and one of the main reasons for irrreversible bilateral blindness in children. Particularly infants born at very early gestational ages or with very low birth weight are affected. In these infants, vascularization of the retina is unfinished at the time of birth. Severeal weeks into the life of these very prematuerly born infants, angiogenic growth factors, mainly vascular endothelial growth factor (VEGF), become upregulated in the avascular parts of the retina, leading to a re-activation of physiologic vascular growth. If all goes well, these re-activated retinal blood vessels progress towards the periphery and lead to a fully vascularized and functional retina. If, however, the vascular activation by VEGF is too strong, then vascular growth becomes disorganized and vessels are redirected away from the retina and into the vitreous. If left untreated, these eyes can then proceed towards tractional retinal detachment and blindness.

Since the 1990s, the standard method of treating ROP has been laser photocoagulation of avascular parts of the retina. This treatment is sensible because VEGF as the main angiogenic driver of pathologic blood vessel growth is expressed in these avascular parts of the retina. The downside of laser treatment, however, is that treated retinal areas are turned into functionless scar tissue and are lost for visual function. In addition, infants treated with laser need to be under general anesthesia for hours during treatment which can be troublesome in very young and fragile preterm infants. And in the long run, infants treated with laser have a high risk of developing high myopia in later life.

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Does Restasis Work For Dry Eye Disease?

MedicalResearch.com Interview with:
Steven Woloshin, MD MS

Steven Woloshin, MD Professor of The Dartmouth Institute Professor of Medicine Professor of Community and Family Medicine

Dr. Steven Woloshin

Professor of The Dartmouth Institute
Professor of Medicine
Professor of Community and Family Medicine
The Center for Medicine in the Media
Dartmouth Institute for Health Policy and Clinical Practice
Lebanon, New Hampshire

MedicalResearch.com: What is the background for this study? What are the main findings?

Response: There has been a lot of debate about the legal maneuvers (ie, transferring patents to the Mohawk Indians) Allergan has employed to delay marketing of generic alternatives to Restasis (cyclosporine ophthalmic emulsion 0.05%).   But there is a more fundamental question that has received little attention:  Does Restasis work?  It is not approved in the European Union, Australia or New Zealand where registration applications were “withdrawn prior to approval due to insufficient evidence of efficacy” in 2001.   Although Canada approved Restasis, its national health technology assessment unit, unconvinced of meaningful benefit, recommended Canada not pay for it – according to our research, no Canadian provincial or federal drug plan currently does.   Nevertheless, Americans have spent $8.8 billion in total sales between 2009 and 2015 on Restasis, including over $2.9 billion in public monies through Medicare Part D.

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Antibiotic Resistance Common In Infections After Ocular Surgery

MedicalResearch.com Interview with:

Dr-Penny Asbell

Dr. Asbell

Penny Asbell, MD
Icahn School of Medicine
Mt. Sinai, New York City.

MedicalResearch.com: What is the background for this study?

─     Bacterial endophthalmitis is a serious, although infrequent, complication of ocular surgery, typically caused by perioperative introduction of bacterial flora from the patient’s own conjunctiva and skin.

─     Prophylactic measures such as perioperative antibiotic treatment may minimize the risk for endophthalmitis, but can be complicated by antibiotic resistant bacteria.

─     The ongoing Antibiotic Resistance Monitoring in Ocular micRoorganisms (ARMOR) study is the only nationwide antibiotic resistance surveillance program specific to ocular pathogens.

─     The purpose of this presentation is to report on the antibiotic susceptibility profiles of bacterial isolates from the vitreous and aqueous humor collected in the ARMOR study expanding upon earlier findings.

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Deep Learning System Can Screen For Diabetic Retinopathy, Glaucoma and Macular Degeneration

MedicalResearch.com Interview with:

Blausen.com staff (2014). "Medical gallery of Blausen Medical 2014". WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.010. ISSN 2002-4436. Illustration depicting diabetic retinopathy

Illustration depicting diabetic retinopathy

Dr. Tien Yin Wong MD PhD
Singapore Eye Research Institute, Singapore National Eye Center,
Duke-NUS Medical School, National University of Singapore
Singapore

MedicalResearch.com: What is the background for this study? What are the main findings?

Response: Currently, annual screening for diabetic retinopathy (DR) is a universally accepted practice and recommended by American Diabetes Association and the International Council of Ophthalmology (ICO) to prevent vision loss. However, implementation of diabetic retinopathy screening programs across the world require human assessors (ophthalmologists, optometrists or professional technicians trained to read retinal photographs). Such screening programs are thus challenged by issues related to a need for significant human resources and long-term financial sustainability.

To address these challenges, we developed an AI-based software using a deep learning, a new machine learning technology. This deep learning system (DLS) utilizes representation-learning methods to process large data and extract meaningful patterns. In our study, we developed and validated this using about 500,000 retinal images in a “real world screening program” and 10 external datasets from global populations. The results suggest excellent accuracy of the deep learning system with sensitivity of 90.5% and specificity of 91.6%, for detecting referable levels of DR and 100% sensitivity and 91.1% specificity for vision-threatening levels of DR (which require urgent referral and should not be missed). In addition, the performance of the deep learning system was also high for detecting referable glaucoma suspects and referable age-related macular degeneration (which also require referral if detected).

The deep learning system was tested in 10 external datasets comprising different ethnic groups: Caucasian whites, African-Americans, Hispanics, Chinese, Indians and Malaysians

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Aravind Eye Care System Reduces Waste and Carbon Footprint From Cataract Surgeries

MedicalResearch.com Interview with:

Cassandra Thiel, PhD Assistant Professor in the Departments of Population Health and Opthamology at NYU Langone Health, and Assistant Professor at NYU Wagner and NYU Tandon School of Engineering

Dr. Thiel

Cassandra Thiel, PhD
Assistant Professor in the Departments of Population Health and Opthamology at NYU Langone Health, and Assistant Professor at NYU Wagner and
NYU Tandon School of Engineering

MedicalResearch.com: What is the background for this study?

Response: Everyone is concerned about the health impacts of climate change, from the United Nations to the Lancet. While other industries are trying to monitor and minimize their environmental footprint, healthcare services have been largely overlooked. Yet, the US healthcare sector emits 10% of the US’s total greenhouse gases.

Cataract surgery is one of the most commonly performed procedures in the world. In the US, these surgeries generate large quantities of waste due to the use of single-use, disposable materials and supplies. However, at Aravind Eye Care System in southern India, the outcomes for this procedure are the same as in the US, but the materials they use are mostly reusable. This study assessed the environmental footprint of Aravind’s surgical process, to determine how their process design and material selection affected their emissions.

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miLOOP Uses Minimal Energy To Encapsulate and Remove Cataracts

MedicalResearch.com Interview with:

Sean Ianchulev, MD MPH Chief Medical Officer VP of Medical Affairs and Business Development Transcend Medical 

Dr. Ianchulev

Sean Ianchulev, MD MPH
Chief Medical Officer
VP of Medical Affairs and Business Development
Transcend Medical 

MedicalResearch.com: What is the background for this study? What are the main findings?

Response: Similar to MIGS stent technology for glaucoma, MiLOOP is a an application of micro-interventional technology for cataract surgery – allows the fragmentation of the lens with simple micro-interventional pen-like device which does not require complex, capital-intense phaco-emulsification…also it does not require vibrational energy

MedicalResearch.com: What should readers take away from your report?

 Iantech introduces a micro-­interventional devices designed to deliver energy-­free endocapsular lens fragmentationResponse: That after 50 years of conventional phacoemulsification cataract technology, new breakthrough micro-interventional approaches are on the horizon.

MedicalResearch.com: What recommendations do you have for future research as a result of this study?

Response: Future studies will evaluate whether micro-interventional approaches for cataract surgery can replace phacoemulsification equipment altogether.

Any disclosures?

I am the founder and Chairman of the company.

MedicalResearch.com: Thank you for your contribution to the MedicalResearch.com community.

Citation: Ianchulev S. Microinterventional cataract surgery. Presented at American Academy of Ophthalmology annual meeting; Nov. 11-14, 2017; New Orleans. 

 

Note: Content is Not intended as medical advice. Please consult your health care provider regarding your specific medical condition and questions.

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