Optometry Commons^™

Non-Canonical Wnt Signaling In The Eye, Ruchi Shah, Cynthia Amador, Steven T Chun, Sean Ghiam, Mehrnoosh Saghizadeh, Andrei A Kramerov, Alexander V Ljubimov

Faculty, Staff and Student Publications

Wnt signaling comprises a group of complex signal transduction pathways that play critical roles in cell proliferation, differentiation, and apoptosis during development, as well as in stem cell maintenance and adult tissue homeostasis. Wnt pathways are classified into two major groups, canonical (β-catenin-dependent) or non-canonical (β-catenin-independent). Most previous studies in the eye have focused on canonical Wnt signaling, and the role of non-canonical signaling remains poorly understood. Additionally, the crosstalk between canonical and non-canonical Wnt signaling in the eye has hardly been explored. In this review, we present an overview of available data on ocular non-canonical Wnt signaling, including developmental …

Optical Characterisation Of Holographic Diffusers And Bangerter Foils For Treatment Of Amblyopia, Matthew Hellis, Suzanne Martin, Matthew Sheehan, Kevin Murphy

Articles

Amblyopia is a significant issue for children worldwide, and current treatment methods have drawbacks that can hinder treatment effectiveness and/or patient experience. This study proposes a new treatment method using holographic diffusers while also comparing their optical characteristics to a current treatment method (Bangerter foils). Holographic diffusers were developed by optically patterning thin polymer layers on a micron scale. Two compositions of photopolymer (acrylamide and diacetone acrylamide based) are analysed herein. Characterisation shows that holographic diffusers of either composition can achieve a wide range of on-axis intensity reductions, allowing for precise and customisable treatment levels by altering recording exposure time …

Effects Of Spaceflight On The Eeg Alpha Power And Functional Connectivity, Sandra Pusil, Jonathan Zegarra-Valdivia, Pablo Cuesta, Christopher Laohathai, Ana Maria Cebolla, Jens Haueisen, Patrique Fiedler, Michael Funke, Fernando Maestú, Guy Cheron

Faculty, Staff and Student Publications

Electroencephalography (EEG) can detect changes in cerebral activity during spaceflight. This study evaluates the effect of spaceflight on brain networks through analysis of the Default Mode Network (DMN)'s alpha frequency band power and functional connectivity (FC), and the persistence of these changes. Five astronauts' resting state EEGs under three conditions were analyzed (pre-flight, in-flight, and post-flight). DMN's alpha band power and FC were computed using eLORETA and phase-locking value. Eyes-opened (EO) and eyes-closed (EC) conditions were differentiated. We found a DMN alpha band power reduction during in-flight (EC: p < 0.001; EO: p < 0.05) and post-flight (EC: p < 0.001; EO: p < 0.01) when compared to pre-flight condition. FC strength decreased during in-flight (EC: p < 0.01; EO: p < 0.01) and post-flight (EC: ns; EO: p < 0.01) compared to pre-flight condition. The DMN alpha band power and FC strength reduction persisted until 20 days after landing. Spaceflight caused electrocerebral alterations that persisted after return to earth. Periodic assessment by EEG-derived DMN analysis has the potential to become a neurophysiologic marker of cerebral functional integrity during exploration missions to space.

Effects Of Different Spectrum Of Leds On Retinal Degeneration Through Regulating Endoplasmic Reticulum Stress, Wenyi Chen, Rong Lin, Kunhong Xiao, Kun Yuan, Zhongjiang Chen, Yan Huang

Faculty, Staff and Student Publications

PURPOSE: To evaluate the impact of full-spectrum light-emitting diodes (LEDs) on albino guinea pigs' retina and investigate the roles of short-wavelength opsin (S-opsin) and endoplasmic reticulum (ER) stress in light-induced retinal degeneration (LIRD).

METHODS: Three-week-old albino guinea pigs (n = 30) were distributed into five groups under 12/12 light/dark cycles with indoor natural light (NC; 300-500 lux, n = 6), full-spectrum LEDs (FL; 300 lux, n = 6; 3000 lux, n = 6), and commercial cold-white LEDs (CL; 300 lux, n = 6; 3000 lux, n = 6) and raised for 28 days. Hematoxylin and eosin staining and transmission electron …

Tracing The Twenty-Year Evolution Of Developing Ai For Eye Screening In Singapore: A Master Chronology Of Sidrp, Selena+ And Eyris, Steven M. Miller

Research Collection School Of Computing and Information Systems

This working paper is entirely comprised of a timeline table that begins in 2002 and runs through mid-2023. Across these two decades, this timeline traces the evolutionary development of the following:

• The early Singapore R&D efforts to apply software-based image analysis algorithms and methods to analyse eye retina images for diabetic retinopathy and other eye diseases. This was based on a collaboration between the Singapore Eye Research Institute (SERI) and its parent organization, the Singapore National Eye Centre (SNEC), with faculty from the School of Computing at National University of Singapore.
• The establishment and operation of the Singapore Integrated Diabetic …

Comprehensive Analysis Of The Retinal Cell Contributions To The Human Erg, Christopher W. Tyler

MODVIS Workshop

Purpose. Standard electroretinogram (ERG) protocols are largely designed to isolate the responses of the rod and cone retinal pathways, including the use of adapting backgrounds to suppress unwanted off-pathway responses. Here, we record spectral ERGs in the low-to-high mesopic sensitivity range in the absence of any adapting background in order to assess interactions between the pathways.

Methods. We have developed a comprehensive neuroanalytic model of the component structure of the ERG driven by knowledge of the underlying retinal physiology, to enhance its power as a critical diagnostic tool for a broad range of both retinal and systemic dysfunctions. The ERG …

Design And Synthesis Of Peripherally Selective Endocannabinoid Enzyme Inhibitors For Ocular Indications, Kezia Reji Thomas

Senior Honors Theses

Peripherally selective compounds have been found to stimulate endocannabinoid receptor activity, which has been observed to have positive physiological effects such as ocular wound healing and inflammation control. The activation of the cannabinoid 1 receptor via binding of the endogenous ligands, anandamide and 2-arachidonoylglycerol, has been indicated to elicit these effects. Both ligands are controlled by two hydrolase enzymes, fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL), which can be targeted for therapeutic inhibition. Sulfonamide derivatives of JZL195 containing carbamate functionalities in the southern region of the inhibitor compounds were produced using novel carbamate exchange reactions. Polar functionalities were …

Acquired Brain Injury: A Vision Screening Protocol For Occupational Therapists, Sebastian Cheung

UNLV Theses, Dissertations, Professional Papers, and Capstones

Occupational therapists have a unique set of skills that allow them to assess individuals with an acquired brain injury who have visual impairments. However, it is frequently neglected in practice owing to a lack of confidence, knowledge, or training. There is a need for a vision screening protocol that will help occupational therapists learn more about visual impairments in adults with an acquired brain injury (ABI) and feel more confident in their ability to identify them. This quality improvement capstone project was a feasibility study and consisted of a sample size of N = 6, utilizing a one group pretest-posttest …

Book Review: The Paradox Of The Immune System: Protection, Chronic Inflammation, Autoimmune Disease, Cancer, And Pandemics, Lourdes A. Fortepiani, Md, Phd

Optometric Clinical Practice

Book Review:

Pandemics, Artificial Intelligence, Optometrists, COVID-19, Immune System Diseases, inflammation

Limitations Of Telemedicine Vs. Face-To-Face Eye Examination In A Patient With New Headaches, Joseph Hallak, Od, Danielle Kalberer, Od

Optometric Clinical Practice

Background: During the emergence and rise of COVID-19, precaution directives and limitations on in-person eye examinations re-routed a significant portion of care to telemedicine and virtual modalities. While these technologies allowed for healthcare communications that otherwise could not occur during such trying times, there are major limitations to these sanctioned applications. This report will present a seemingly benign case that could have easily been re-routed from an in-person examination to a telemedicine version due to the patient’s seemingly “routine” vision complaints.

Case Report: A 50-year-old male patient contacted the eye clinic with a complaint of a minor, new, unexplained headache …

Lyme Disease Neuroretinitis: A Case Report And Review Of Immunologic Workup, Michael Wingard, Od, Jeffery Curry, Od, Jeffrey L. Weaver, Od, Ms

Optometric Clinical Practice

Background: Lyme disease is an infection caused by a bacterial spirochete of the borrelia genus. The human vector is from a tick bite by an infected tick of the ixodes genus, commonly referred to as the deer tick or black legged tick. The incidence of Lyme disease is increasing in the United States. Once infected, Lyme disease manifestations usually depend on the stage of infection with late stage infection often causing debilitating illness.¹

Case Report: Neuroborreliosis refers to borrelia, causing neurological infection and can occur as acute or late manifestation of Lyme disease. Neuroretinitis is a rare …

Ocular Manifestations Of Septo-Optic Dysplasia, Rena Cappelli, Od, Tiffany Tucker Christiansen, Od, Danielle Vance Taylor, Od

Optometric Clinical Practice

Background: Septo-optic dysplasia (SOD) is a congenital deformity of the brain which can result in neurologic, systemic, and physical malformation.Due to the proximity of these deformities to the optic chiasm and optic nerves, ocular manifestations are common.

Case Report: A 28-year-old male with a long-standing history of reduced vision presented for a routine eye examination. Upon examination he was found to have an afferent pupillary defect, bilateral optic nerve pallor with corresponding nerve fiber layer thinning by optical coherence tomography. Humphrey visual field testing revealed a bi-temporal visual field defect. Neurological imaging was obtained with a subsequent diagnosis …

Multimodal Imaging Reveals Bilateral Idiopathic Multiple Retinal Pigment Epithelial Detachments: A Case Report, Diana H. Ho, Od, Joseph J. Pizzimenti, Od, Patricia C. Sanchez-Diaz, Dvm, Phd, Stephanie Schmiedecke-Barbieri, Od, Alexandra Zuercher, Od

Optometric Clinical Practice

Background: Retinal pigment epithelial detachment (RPED) is a nonspecific finding that is common in several ocular diseases; however, cases of bilateral idiopathic multiple RPEDs are rare. Less than 50 cases have been reported to date. Bilateral multiple RPEDs are usually idiopathic and benign in nature but can infrequently be associated with various ocular and systemic diseases, including central serous chorioretinopathy (CSC). The potential role of genetic factors in this condition remains elusive. We present a case where multimodal imaging assisted in revealing the diagnosis as well as discuss the potential implications of some of the genetic findings for this …

Acute Syphilitic Posterior Placoid Chorioretinitis; A Case Report And Review, Kristin Wilson, Od, Amy Garbo Maxey, Od

Optometric Clinical Practice

Background: Acute syphilitic posterior placoid chorioretinopathy (ASPPC) is a rare but defining characteristic of ocular syphilis. Clinical findings are subtle, geographic, yellowish, macular lesions, affecting the outer-retina and inner choroid, and often associated with subretinal fluid in the early phase. This case report will review the clinical signs of ASPPC to aid the practitioner in identification and recognition of its clinical importance as it relates to early diagnosis, treatment and prognosis.

Case Report: A 79-year-old African American male presented to clinic with a chief complaint of blur in the right eye for the past two days. Spectral Domain Optical Coherence …

Optic Disc Drusen Resulting In Disqualifying Field Loss, Robert C. Binkley, Od

Optometric Clinical Practice

Background: Optic nerve (or disc) drusen is the presence of hyaline bodies at the optic nerve head. The drusen may be visible upon funduscopic examination or may present as buried. Timely diagnosis and responsible imaging may help inform the patient of the potential for future concerns. The long-term prognosis is good for most patients, however, they may experience progressive peripheral vision loss that may reduce the patient’s quality of life. Neuroprotective options have previously been discussed with minimal clinical effectiveness, however, new medications may aid in future treatment.

Case Report: A patient presenting with mild and slowly progressing vision loss …

You Can Lead A Horse To Water, Paul B. Freeman, Od

Optometric Clinical Practice

Letter from the Editor

Barriers To Screening For Diabetic Retinopathy: A Scoping Review, Amy Cooper Rn, Bsn, Lajerica Bates Rn, Bsn, Julie Bridges Rn, Bsn, Laura Reed Dnp, Fnp-Bc

Doctor of Nursing Practice Projects

Purpose/Background

More than 34 million people in the United States have diabetes. Diabetic retinopathy (DR) is a major complication of diabetes and a leading cause of vision loss. Risk factors for diabetic retinopathy include Type 1 and Type 2 Diabetes, hypertension, smoking, and being African American or Hispanic/Latino. This scoping review seeks to analyze the current research on ways to increase vision screenings, thus reducing cases of diabetic retinopathy in adults.

Methods

Between September 2020 and November 2021, a search was conducted using PubMed, EBSCOhost, Medline, and CINAHL to identify articles using keywords such as diabetic retinopathy and ophthalmology. This …

Direct Costs Of Second Aqueous Shunt Implant Versus Transscleral Cyclophotocoagulation (The Assists Trial), Jack X Ma, Alice Z Chuang, Robert M Feldman, Steve L Mansberger, Angelo P Tanna, Lauren S Blieden, Daniel Shoham, Nicholas P Bell, Ronald L Gross, Louis R Pasquale, David S Greenfield, Jeffrey M Liebmann, Robert N Weinreb

Faculty, Staff and Student Publications

PRCIS: The cost of cyclophotocoagulation is less than the cost of a second glaucoma drainage device.

PURPOSE: To compare the total direct costs of implantation of a second glaucoma drainage device (SGDD) with transscleral cyclophotocoagulation (CPC) for patients with inadequately controlled intraocular pressure (IOP) reduction, despite the presence of a preexisting glaucoma drainage device in the ASSISTS clinical trial.

METHODS: We compared the total direct cost per patient, including the initial study procedure, medications, additional procedures, and clinic visits during the study period. The relative costs for each procedure during the 90-day global period and the entire study period were …

The Association Between Time Spent On Screens And Reading With Myopia, Premyopia And Ocular Biometric And Anthropometric Measures In 6- To 7-Year-Old Schoolchildren In Ireland, Síofra Harrington, Veronica O'Dwyer

Articles

Purpose More time spent on near tasks has consistently been associated with the promotion of myopia. The World Health Organization advises limiting daily screentime to less than 2 h for children aged five and over. This study explored the relationship between time spent on screens and reading/writing with refractive status, ocular biometric and anthropometric factors in 6-to 7-year- olds in Ireland.

Methods Participants were 723 schoolchildren (377 boys [51.8%]), mean age 7.08 (0.45) years. The examination included cycloplegic autorefraction (1% cyclopentolate hydrochloride), ocular biometry (Zeiss IOLMaster), height (cm) and weight (kg). Screentime and reading/writing time were reported by parents/legal guardians …

Vitamin C Contributes To Epigenetic Regulation Of Genes Related To Diabetic Retinopathy In Retinal Endothelial Cells, Elizabeth L. Turner, Jonathon Reynolds, Walker Kay, Marianne Becnel, Matthew Conway, Alexander Kim, John A. Kriak, Kyle B. Bills, David W. Sant

Annual Research Symposium

No abstract provided.