Publications by authors named "Philip G Hykin"

Background: In previous landmark studies on central retinal vein occlusion, retinal nonperfusion assessments were obtained using 7-field (7F) angiography. The widespread current use of widefield imaging allows better visualization of the peripheral retina and more comprehensive estimation of the total area of nonperfusion. The relationship between nonperfusion measurement of 7F and widefield angiography (WFA) in central retinal vein occlusion has not been studied.

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Aims: To report, using ultra-widefield angiography (UWFA) the area, distribution, and change in retinal capillary nonperfusion (RCNP) at baseline and 100 weeks in eyes with central retinal vein occlusion (CRVO) receiving anti-VEGF for macula oedema.

Methods: Prospective longitudinal multi-centre cohort study. Adults with CRVO treated with anti-VEGF therapy for macular oedema underwent UWFA at baseline and week-100.

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Purpose: To report a case of posterior microphthalomos (PM) related to PRSS56 gene mutation with long term follow up with multimodal imaging findings.

Methods: Single retrospective case report.

Results: A 43-year old male patient presented in 2009 with bilateral reduced vision.

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Purpose: To assess visual and optical coherence tomography-derived anatomical outcomes of treatment with intravitreal aflibercept (Eylea®) for diabetic macular oedema in patients switched from intravitreal ranibizumab (Lucentis®).

Design: Retrospective, cohort study.

Participants: Ninety eyes (of 67 patients) receiving intravitreal anti-vascular endothelial growth factor therapy were included.

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Background/aims: To assess structural and functional outcomes of treatment with intravitreal aflibercept (®Eylea) for diabetic macular oedema in treatment-naïve patients.

Methods: Sixty-four eyes receiving intravitreal anti-vascular endothelial growth factor therapy were included in the data analysis of this retrospective, real-life study which follow-up was 3 years. Each patient had corrected visual acuity in Early Treatment Diabetic Retinopathy Study letters and optical coherence tomography central foveal thickness and macular volume performed at baseline, 12, 24 and 36 months.

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Purpose: We study the relationship between retinal vessel oxygenation and the spatial distribution of retinal nonperfusion using ultrawide field angiography in eyes with retinal vascular diseases.

Methods: This prospective single center study recruited 57 eligible eyes from 44 patients with retinal vascular diseases. Retinal oximetry measurements were obtained using the Oxymap T1 device to determine the arteriovenous (AV) difference.

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Importance: Threshold of retinal nonperfusion for the development of proliferative diabetic retinopathy (PDR) is unclear.

Objectives: To identify a threshold of retinal nonperfusion for the presence of retinal neovascularization and the distribution and area of retinal nonperfusion in eyes with severe nonproliferative diabetic retinopathy (NPDR), PDR, neovascularization of the optic disc (NVD), and retinal neovascularization elsewhere (NVE).

Design, Setting, And Participants: This cross-sectional image analysis study was performed between September 24, 2018, and October 24, 2018, at a multicenter national study in the United Kingdom.

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Objectives: To assess structural and functional outcomes of treatment with intravitreal aflibercept (Eylea) for diabetic macular oedema in treatment-naive patients.

Design: This is a retrospective, real-life, cohort study.

Participants And Methods: In all, 92 diabetic patients (102 eyes) receiving intravitreal anti-vascular endothelial growth factor therapy were included.

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Purpose: To review the clinical characteristics and address the aetiology in a group of patients presenting with unilateral retinal pigmentary changes, best described as unilateral pigmentary retinopathy (UPR).

Methods: The cohort of 42 patients was identified retrospectively from the Moorfields Eye Hospital electrophysiology database. All had undergone full-field [electroretinography (ERG)] and pattern electroretinography (PERG), with 13 additionally having multifocal ERG (mfERG).

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Purpose: To evaluate the efficacy and safety of ranibizumab 0.5 mg in adolescent patients with any choroidal neovascularization etiology enrolled in the 12-month MINERVA study.

Methods: In the open-label, non-randomized study arm, ranibizumab 0.

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Purpose: The purpose of this study was to study the effects of panretinal photocoagulation (PRP) and intravitreal aflibercept on retinal vessel oxygen saturations, area of retinal nonperfusion, and area of neovascularization in proliferative diabetic retinopathy.

Methods: This is a prospective randomized single center study. Forty patients with proliferative diabetic retinopathy were randomized to PRP or intravitreal aflibercept treatment for 52 weeks.

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Introduction: To report 3-year treatment outcomes with intravitreal aflibercept injections for neovascular age-related macular degeneration (nAMD) in routine clinical practice.

Methods: This was a retrospective, single-centre, non-randomized interventional case series analysis. Data from treatment-naïve patients with nAMD treated between 1 October 2013 and 31 February 2014 were included in the analysis.

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Background: Diabetic macular edema (DME) and proliferative diabetic retinopathy (PDR) are sight-threatening complications of diabetes mellitus and leading causes of adult-onset blindness worldwide. Genetic risk factors for diabetic retinopathy (DR) have been described previously, but have been difficult to replicate between studies, which have often used composite phenotypes and been conducted in different populations. This study aims to identify genetic risk factors for DME and PDR as separate complications in Australians of European descent with type 2 diabetes.

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Purpose: To evaluate the efficacy and safety of ranibizumab 0.5 mg in adult patients with macular edema (ME) resulting from any cause other than diabetes, retinal vein occlusion, or neovascular age-related macular degeneration.

Design: A phase 3, 12-month, double-masked, randomized, sham-controlled, multicenter study.

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Purpose: To study the effects of different axial lengths on ultra-widefield imaging to determine the presence of distortion in images despite software correction and calculate an enlargement factor based on angular location.

Design: Experimental image analysis study.

Study Objects: Three 3-dimensional printed model eyes simulating eyes with axial lengths of 22, 24, and 26 mm.

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Purpose: To review the definition of ischaemic central retinal vein occlusion (CRVO) and stratify the risk of neovascular complication based on wider areas of visible retinal non-perfusion.

Design: Retrospective consecutive case series and image analysis study.

Methods: Setting: Moorfields Eye Hospital, London, United Kingdom.

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Purpose: To evaluate the efficacy and safety of ranibizumab 0.5 mg in adult patients with choroidal neovascularization because of an uncommon cause enrolled in the 12-month MINERVA study.

Methods: In this Phase III, double-masked study, adult (≥18 years) patients (N = 178) were randomized 2:1 to receive either ranibizumab (n = 119) or sham (n = 59) at baseline and, if needed, at Month 1 and open-label individualized ranibizumab from Month 2.

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Purpose: To determine visual acuity (VA) and spectral-domain optical coherence tomography (OCT) outcomes with intravitreal ranibizumab for diabetic macular edema (DME) in a United Kingdom National Health Service clinical setting.

Design: Retrospective interventional case series.

Participants: Consecutive patients with DME, treated with the first ranibizumab injection between August 2013 and March 2014 across 4 sites of Moorfields Eye Hospital, London.

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Background And Objectives: To describe posterior segment distortions in Optos ultra-widefield images (Optos 200TX; Optos, Dunfermline, United Kingdom) compared to Topcon retinal camera images (Topcon, Tokyo, Japan) using optic disc dimensions and exploring a proposed method for correcting these distortions.

Patients And Methods: Comparative image analysis study on 20 eyes with color fundus images from Optos and Topcon. A model eye with vertical and horizontal grids imaged with Optos in the conventional position and rotated 90° was analyzed.

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Background/aims: To evaluate the clinical efficacy and safety of combined repeated Ozurdex and macular laser therapy (MLT) compared with MLT monotherapy in participants with visual impairment due to centre-involving diabetic macular oedema (DMO).

Methods: 80 patients with best corrected visual acuity (BCVA) between 54 and 78 ETDRS letters due to centre-involving DMO were randomised to combination therapy with Ozurdex and MLT or MLT only. The combination arm received mandated Ozurdex injections at baseline and 16 weeks followed by retreatment criteria-guided pro-re-nata therapy at 32 and 48 weeks.

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