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Huang X, Anderson T, Dubra A. Retinal magnification factors at the fixation locus derived from schematic eyes with four individualized surfaces. BIOMEDICAL OPTICS EXPRESS 2022; 13:3786-3808. [PMID: 35991930 PMCID: PMC9352277 DOI: 10.1364/boe.460553] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 05/02/2023]
Abstract
Retinal magnification factors (RMFs) allow the conversion of angles to lengths in retinal images. In this work, we propose paraxial and non-paraxial RMF calculation methods that incorporate the individual topography and separation of the anterior and posterior surfaces of the cornea and crystalline lens, assuming homogeneous ocular media. Across 34 eyes, the two RMF methods differ by 0.1% on average, due to surface tilt, decenter, and lack of rotational symmetry in the non-paraxial modeling, which results in up to 2.2% RMF variation with retinal meridian. Differences with widely used individualized RMF calculation methods are smallest for eyes with ∼24 mm axial length, and as large as 7.5% in a 29.7 mm long eye (15D myope). To better model the capture of retinal images, we propose the tracing of chief rays, instead of the scaling of posterior nodal or principal distances often used in RMF definitions. We also report that RMF scale change is approximately proportional to both refractive error and axial separation between the ophthalmoscope's exit pupil and the eye's entrance pupil, resulting in RMF changes as large as 13% for a 1cm displacement in a 15D myopic eye. Our biometry data shows weak correlation and statistical significance between surface radii and refractive error, as well as axial length, whether considering all eyes in the study, or just the high myopes, defined as those with refractive error sphere equivalent ≤ -4D. In contrast, vitreous thicknesses show a strong correlation (r ≤ -0.92) and significance (p ≤ 10-13) with refractive error when considering all eyes or just high myopes (r ≤ -0.95; p ≤ 10-5). We also found that potential RMF change with depth of cycloplegia and/or residual accommodation is smaller than 0.2%. Finally, we propose the reporting of individual ocular biometry data and a detailed RMF calculation method description in scientific publications to facilitate the comparison of retinal imaging biomarker data across studies.
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Affiliation(s)
- Xiaojing Huang
- Institute of Optics, University of Rochester, Rochester, NY 14620, USA
- Byers Eye Institute, Stanford University, Palo Alto, CA 94303, USA
| | | | - Alfredo Dubra
- Byers Eye Institute, Stanford University, Palo Alto, CA 94303, USA
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Martin GC, Brousse V, Connes P, Grevent D, Kossorotoff M, Da Costa L, Bourdeau H, Charlot K, Boutonnat-Faucher B, Allali S, De Montalembert M, Bremond-Gignac D, Vidal PP, Robert MP. Retinal atrophy and markers of systemic and cerebrovascular severity in homozygous sickle cell disease. Eur J Ophthalmol 2022; 32:3258-3266. [DOI: 10.1177/11206721221090794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Introduction While paramacular retinal atrophy (PRA) is known to be found in 48% of eyes of adults and 42% of eyes of children with homozygous SCD (SS-SCD), the aim of this study is to assess the association between PRA and red blood cell (RBC) deformability, hematological markers and brain imaging abnormalities in SS-SCD. Methods This study is a subset of DREAM2, a prospective observational study performed between August 2015 and August 2016. Children (5–17 years) with SS-SCD and no history of large vessel vasculopathy, were included. Ophthalmological characteristics including visual acuity, fundus examination, OCT of central and temporal retina (with several retinal thickness measurements) were explored in relation with RBC deformability (ektacytometry), hematological and biochemical (hemolysis parameters), and neurological (cerebral oxygenation estimated by Near Infrared Spectroscopy, brain magnetic resonance imaging) investigations. Results 17 children (5 boys; mean age: 13 years) with complete ophthalmological investigations were included in the analysis; 8 exhibited PRA. RBC deformability was found to be significantly lower in children with PRA for measurements made at 1.69 Pa (0.16 a.u ± 0.02 vs 0.21 a.u ± 0.03, p = 0.02) and above, as well as cerebral oxygenation (59.25% ± 9.9 vs 71.53% ± 4.9, p = 0.02). A significant positive correlation was found between temporal retinal thickness and hemoglobin level (ρ = 0.65, p = 0.007), hematocrit (ρ = 0.53, p = 0.04) and RBC deformability at 3 Pa (ρ = 0.75, p = 0.005) and above. Conclusions These results suggest that PRA could be an early marker of systemic severity and cerebral oxygenation in SCD. Whether it could help predicting cerebral vasculopathy requires further investigations.
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Affiliation(s)
- Gilles C. Martin
- Ophthalmology Department and Rare Ophthalmological Diseases Reference Centre (OPHTARA), Necker-Enfants Malades University Hospital, APHP, Paris, France
- Borelli Centre, CNRS-SSA-ENS Paris Saclay-Paris University, Paris, France
- Ophthalmology Department, Rothschild Foundation Hospital, Paris, France
| | - Valentine Brousse
- General Pediatrics Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
- Institut National de la transfusion sanguine, UMR_S1134, Inserm, Paris, France
- LABEX GR-Ex, France
| | - Philippe Connes
- Faculté de Médecine Rockefeller, Laboratoire inter-universitaire de Biologie de la Motricité (LIBM EA7424), Equipe « Biologie Vasculaire et du Globule Rouge », Université Claude Bernard Lyon 1, Lyon, France
| | - David Grevent
- Radiology Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
| | - Manoelle Kossorotoff
- Pediatric Neurology Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
| | - Lydie Da Costa
- Institut National de la transfusion sanguine, UMR_S1134, Inserm, Paris, France
- LABEX GR-Ex, France
- AP-HP, Hôpital Robert Debré, service d’Hématologie Biologique, Paris, France
| | - Hélène Bourdeau
- Pediatric Neurology Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
| | - Keyne Charlot
- Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels Institut de Recherche Biomédicale des Armées, France
| | | | - Slimane Allali
- General Pediatrics Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
- LABEX GR-Ex, France
| | - Mariane De Montalembert
- General Pediatrics Department, Necker-Enfants Malades University Hospital, APHP, Paris, France
- LABEX GR-Ex, France
| | - Dominique Bremond-Gignac
- Ophthalmology Department and Rare Ophthalmological Diseases Reference Centre (OPHTARA), Necker-Enfants Malades University Hospital, APHP, Paris, France
- INSERM UMRS 1138, Team 17, Centre de Recherche des Cordeliers, Sorbonne Paris University, France
| | - Pierre-Paul Vidal
- Borelli Centre, CNRS-SSA-ENS Paris Saclay-Paris University, Paris, France
| | - Matthieu P. Robert
- Ophthalmology Department and Rare Ophthalmological Diseases Reference Centre (OPHTARA), Necker-Enfants Malades University Hospital, APHP, Paris, France
- Borelli Centre, CNRS-SSA-ENS Paris Saclay-Paris University, Paris, France
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Hussnain SA, Coady PA, Slade MD, Carbonella J, Pashankar F, Adelman RA, Stoessel KM. Hemoglobin level and macular thinning in sickle cell disease. Clin Ophthalmol 2019; 13:627-632. [PMID: 31114143 PMCID: PMC6489663 DOI: 10.2147/opth.s195168] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/28/2019] [Indexed: 11/23/2022] Open
Abstract
Purpose: To study the relationship between complete blood count (CBC) indices over time, particularly serum hemoglobin (Hb) levels, and severity of macular thinning on spectral domain optical coherence tomography (SD-OCT) in patients with sickle cell disease (SCD). Methods: This is a single-center, retrospective analysis of 141 consecutive SCD patients over a 10-year period, of which 40 patients (79 eyes) had SD-OCT imaging of the macula and 29 (58 eyes, mean age 17.5 years) were eligible for the study. Investigators reviewed electronic medical records for documentation of retinopathy stage, disease genotype, CBC values, and SD-OCT imaging. SD-OCT parameters and CBC values were compared between different retinopathy stages and disease genotypes. Regression analyses were performed on SD-OCT parameters and CBC values. Results: Of the 58 eligible eyes (34HbSS, 18HbSC, 4HbSβ +thal, 2HbS βthal), 18 had PSR (proliferative sickle retinopathy), 14 had NPSR (nonproliferative sickle retinopathy), and 26 had NSR (no sickle retinopathy). Hb values were higher in SC group compared to SS group. Macular thickness in the temporal inner (Δ=26±33 um, p=0.01) and outer (Δ=21±30 um, p=0.02) subfields was higher in SC compared to SS group. Patients with SD-OCT thinning below the 5th percentile in the temporal outer subfields had lower recorded Hb nadirs (6.0±0.9) compared to those with thickness within the top 95th percentile (9.1±2.3). Regression analysis showed temporal macular thickness to be positively correlated with Hb values in the SS group. Conclusion: Macular thinning observed on SD-OCT in SCD patients with SS genotype may be related to the level of anemia in this population.
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Affiliation(s)
- S Amal Hussnain
- Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT, USA.,Department of Ophthalmology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA.,Vitreous Retina Macula Consultants of New York, New York, NY, USA.,Department of Ophthalmology, New York University School of Medicine, New York, NY, USA
| | - Patrick A Coady
- Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT, USA.,New England Retina Associates, Hamden, CT, USA
| | - Martin D Slade
- Department of Internal Medicine, Yale University School of Medicine and Yale School of Public Health, New Haven, CT, USA
| | - Judith Carbonella
- Department of Pediatric Hematology and Oncology, Yale University School of Medicine, New Haven, CT, USA
| | - Farzana Pashankar
- Department of Pediatric Hematology and Oncology, Yale University School of Medicine, New Haven, CT, USA
| | - Ron A Adelman
- Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT, USA
| | - Kathleen M Stoessel
- Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT, USA
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