Foundation Fighting Blindness

PurposeThe Foundation Fighting Blindness (FFB) Consortium is a collaboration of 41 international clinical centers that manage patients affected with inherited retinal diseases (IRDs). The annual Consortium gene poll was initiated in 2020 to capture the genetic cause of disease in patients with IRD and associated clinical practices of Consortium sites. Data from the 2022 gene poll are reported here.MethodsIn 2022, academic, private practice, and government ophthalmology clinics that are members of the Consortium centers were polled to identify per-case IRD genetic causality from a list of 387 syndromic and nonsyndromic IRD genes. The survey also assessed how genetic testing was obtained and clinical practices of the sites.ResultsThirty centers responded and reported genetic data from 33,834 patients (27,561 families). Disease-causing variants were reported in 293 of 387 genes. The most common genetic etiologies were ABCA4 (17%), USH2A (9%), RPGR (6%), PRPH2 (5%), and RHO (4%). The top 100 genes accounted for the genetic cause of disease in 94.4% of patients. Two-thirds of the centers had at least one genetic counselor. In the 21 US sites, genetic testing was commonly obtained through sponsored programs (95%, FFB-My Retina Tracker Programs or Spark-ID Your IRD), whereas in the 9 non-US sites, genetic testing was commonly obtained using either patient- or public health system-funded testing pipelines. Clinical work-up of patients with IRD most commonly included updating history, eye examination, and optical coherence tomography.ConclusionsThis report provides the largest assessment of genetic causality in the IRD patient population across multiple continents to date.

PurposeAge-related macular degeneration (AMD) is a leading cause of irreversible vision loss. Documentation of the disease’s description and treatment experience of Canadian patients is limited but of interest given the aging population and resultant implications for healthcare systems. A mixed-methods study was conducted to understand the challenges experienced by patients living in Canada with AMD to identify areas of need and for potential reform.Patients and MethodsCanadian residents with wet or dry AMD were eligible for participation in an online survey and one-on-one telephone interview regarding their disease experience. Participants were recruited via a not-for-profit stakeholder organization and an ophthalmology clinic. Surveys were completed from January–June 2020 and interviews were conducted from November–December 2020, with findings reported using descriptive statistics and thematic analysis, respectively.ResultsFindings from 303 survey responses and 20 interviews were analyzed. Most participants indicated their vision loss negatively impacts their ability to conduct daily activities (eg, self care, driving) and leads to constant worry, loneliness, and/or isolation. Participants frequently reported requiring caregiver support, often for eye appointment travel or everyday tasks. Regardless of AMD type, participants reported having several appointments each year, and that time spent travelling to/from and waiting at appointments and related costs were considerable. Although participants receiving anti-vascular endothelial growth factor injections valued treatment, the experience added additional burden related to anxiety, fear, pain, and even greater reliance on caregivers. Many participants indicated they felt poorly informed about their disease and treatment options, particularly at diagnosis, which increased their emotional burden.ConclusionPatients with AMD living in Canada experience a significant and persistent mental, physical, and financial burden as a direct result of their disease. Improvements to provision of disease-related information, support of daily activities and appointment attendance, and the overall treatment experience could substantially enhance outcomes among the growing population of patients with AMD.

To evaluate functional and structural assessments as endpoints for clinical trials for USH2A-related retinal degeneration. People with biallelic disease-causing variants in USH2A, visual acuity ≥ 20/80, and visual field ≥ 10° diameter were enrolled in a 4-year, natural history study. Participants underwent static perimetry, microperimetry, visual acuity, fullfield stimulus testing (FST), and optical coherence tomography annually. Rates of change estimated from mixed-effects linear models and percentages of eyes with changes exceeding the coefficient of repeatability (CoR) or thresholds conforming with U.S. Food and Drug Administration (FDA) guidelines were evaluated. Rates of change were generally more sensitive to change than proportions of eyes exceeding a threshold such as the CoR. Baseline ellipsoid zone area ≥ 3mm2 was necessary to detect change. Mean sensitivity and volumetric hill of vision measures on static perimetry had similar properties and were the most sensitive to changes of the continuous measures. The highest 4-year proportions of eyes exceeding the CoR were from FST testing (47%) and microperimetry (32%). Specification of loci as functional transition points (FTPs) resulted in 45% (static perimetry) and 46% (microperimetry) at 4years, meeting FDA guidelines for progression. Rate of change of mean sensitivity on static perimetry was a sensitive perimetric continuous measure. Percentages of within-eye change were largest with FST testing and microperimetry. FTPs appear to be particularly sensitive to change. These results affect clinical trial design for USH2A-related retinal degeneration. Analyses of natural history data from the Rate of Progression in USH2A-Related Retinal Degeneration (RUSH2A) study can inform eligibility criteria and endpoints for clinical trials.

Examination of relevant data and recommendations for the successful clinical development of gene therapies for RPGR-associated XLRP.

Retinitis pigmentosa (RP) and Leber congenital amaurosis (LCA) are rare inherited retinal degenerative disorders resulting in visual impairments and impacts on patients' vision-dependent activities of daily living (ADL), mobility and distal health-related quality of life (HRQoL). This study aimed to conduct qualitative research to understand the patient experience of RP/LCA across genotypes and inform development of patient- and observer-reported outcome (PRO/ObsRO) instruments in RP/LCA. Research activities included a qualitative literature review and review of existing visual function PRO instruments in RLBP1 RP, and concept elicitation (CE) and cognitive debriefing (CD) interviews of existing PRO instruments with patients with RLBP1 RP, expert clinicians, and payers. In wider RP/LCA, a social media listening (SML) study and a qualitative literature review was conducted, while psychometric evaluation of a PRO instrument in LCA was performed. Input from expert clinicians was sought at key stages. Findings from the qualitative literature reviews identified a range of visual function symptoms which had significant impacts on patients' vision-related ADL and distal HRQoL. Patient interviews identified additional visual function symptoms and impacts not previously reported in published literature. These sources informed development and refinement of a conceptual model displaying the patient experience of RP/LCA. Review of existing visual function PRO instruments, and CD interviews evaluating their content validity, confirmed that no existing instrument provides a comprehensive assessment of all concepts relevant to patients with RP/LCA. This highlighted the need for development of the Visual Symptom and Impact Outcomes PRO and ObsRO instruments to adequately assess the patient experience of RP/LCA. Results informed and supported development of the instruments to assess visual functioning symptoms and vision-dependent ADL, mobility and distal HRQoL in RP/LCA, in accordance with regulatory standards. Next steps to further support use in RP/LCA clinical trials/practice includes content and psychometric validation of the instruments in this population.

PurposeTo identify challenges and opportunities for the development of treatments for Usher syndrome (USH) type 1B.MethodsIn September 2021, the Foundation Fighting Blindness hosted a virtual workshop of clinicians, academic and industry researchers, advocates, and affected individuals and their families to discuss the challenges and opportunities for USH1B treatment development.ResultsThe workshop began with insights from individuals affected by USH1B. Presentation topics included myosin VIIA protein function in the ear and eye and its role in disease pathology; challenges with the USH1B mouse model most used in disease research to date; new investigations into alternative disease models that may provide closer analogues to USH1B in the human retina, including retinal organoids and large animal models; and learnings from and limitations of available disease natural history data. Participants discussed the need for an open dialogue between researchers and regulators to design USH1B clinical trials with appropriate outcome measures of vision improvement, along with multimodal imaging of the retina and other testing approaches that can help inform trial designs. The workshop concluded with presentations and a roundtable reviewing emerging treatments, including USH1B-targeted genetic augmentation therapy and gene-agnostic approaches.ConclusionsInitiatives like this workshop are important to foster all stakeholders in support of achieving the shared goal of treating and curing USH1B.Translational RelevancePresentations and discussions focused on overcoming disease modeling and clinical trial design challenges to facilitate development, testing, and implementation of effective USH1B treatments.

Natural history studies of inherited retinal diseases (IRDs) play a critical role in the design and implementation of treatment trials. Study objectives ideally encompass (1) understanding the time course and pattern of disease progression, (2) within genotypic and phenotypic subtypes of patient populations, and (3) characterizing a range of measures of vision function, retinal structure, and functional vision that may serve as endpoints. In rare disease, data quality standards are paramount to optimizing smaller sample sizes, including a prospective, standardized, and longitudinal approach to data collection. Multicenter studies additionally facilitate strength in numbers and generalizability, and multidisciplinary collaboration ensures a holistic approach to study design and knowledge-building. Dissemination of natural history study results, data sets, and lessons learned will stimulate further innovation and progress in IRD therapeutic research, including setting up future trial designs for their best chance of success.

Independence is both a sense of autonomy and self-reliance coupled with the skills to complete tasks without assistance. Questionnaire of caregivers of individuals with Down syndrome asked about factors related to independence on six topics: safety, communication, self-care, daily living, social/leisure, and vocational/employment. Responses from 408 caregivers to an independence questionnaire were received, and summarized using means and frequencies. Top goals by topic were safety from sexual abuse, communicating wants and needs, toileting independently, living independently/semi-independently, engaging in leisure time appropriately, and reading and writing. Independence is a complex, multifactorial phenomenon which varies among individuals with DS.

Sensorineural hearing loss (SNHL) is characteristic of Usher syndrome type 2 (USH2), but less is known about SNHL in nonsyndromic autosomal recessive retinitis pigmentosa (ARRP) and olfaction in USH2A-associated retinal degeneration. The Rate of Progression of USH2A-related Retinal Degeneration (RUSH2A) is a natural history study that enrolled 127 participants, 80 with USH2 and 47 with ARRP. Hearing was measured by pure-tone thresholds and word recognition scores, and olfaction by the University of Pennsylvania Smell Identification Test (UPSIT). SNHL was moderate in 72% of USH2 participants and severe or profound in 25%, while 9% of ARRP participants had moderate adult-onset SNHL. Pure-tone thresholds worsened with age in ARRP but not in USH2 participants. The degree of SNHL was not associated with other participant characteristics in either USH2 or ARRP. Median pure-tone thresholds in ARRP participants were significantly higher than the normative population (p< 0.001). Among 14 USH2 participants reporting newborn hearing screening results, 7 reported passing. Among RUSH2A participants, 7% had mild microsmia and 5% had moderate or severe microsmia. Their mean (±SD) UPSIT score was 35 (±3), similar to healthy controls (34 [±3]; p= 0.39). Olfaction differed by country (p= 0.02), but was not significantly associated with clinical diagnosis, age, gender, race/ethnicity, smoking status, visual measures, or hearing. Hearing loss in USH2A-related USH2 did not progress with age. ARRP patients had higher pure-tone thresholds than normal. Newborn hearing screening did not identify all USH2A-related hearing loss. Olfaction was not significantly worse than normal in participants with USH2A-related retinal degeneration.