Publications by authors named "Gokulan Ratnarajan"

The use of AI-based techniques in healthcare are becoming more and more common and more disease-specific. Glaucoma is a disorder in eye that causes damage to the optic nerve which can lead to permanent blindness. It is caused by the elevated pressure inside the eye due to the obstruction to the flow of the drainage fluid (aqueous humor).

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Background: Minimally invasive glaucoma procedures are emerging as clinically effective and safe glaucoma management approaches; however, evidence regarding quality-of-life outcomes is limited.

Objectives: To explore the impact of minimally invasive glaucoma surgery (MIGS) combined with phacoemulsification on patient-reported outcomes and clinical parameters related to ocular surface disease in people with glaucoma.

Design: Retrospective observational study.

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Background: Minimally invasive glaucoma surgery (MIGS), including minimally invasive bleb surgery (MIBS), is a rapidly evolving area of research and clinical interest in ophthalmology. The growing number of devices has necessitated evaluations to identify subtle differences in outcomes between treatments.

Objectives: To compare clinical effectiveness and safety outcomes of iStent combined with endoscopic cyclophotocoagulation (ICE2) with bleb forming PreserFlo MicroShunt (PMS) and XEN-45 gel implant in a 24-month retrospective review.

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Aim: Comparing outcomes after combined phacoemulsification, two iStents insertion and endocyclophotocoagulation (ECP) versus phacoemulsification-iStents alone.

Methods: This is a longitudinal retrospective 12 months study in eyes with ocular hypertension or early-to-moderate open angle glaucoma. Level of disease, intraocular pressure (IOP) and tolerance of glaucoma medication were considered before planning surgery.

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Objective: To evaluate and compare the surgeon's learning experience with an ab-interno gelatin microstent (XEN-45, Allergan) to other glaucoma surgeries.

Design: Cross-sectional survey study.

Methods: All surgeons in Canada who used the gelatin microstent were identified and given an anonymous online survey (FluidSurveys, Survey Monkey) designed to evaluate key factors associated with the device, including prior surgical experience, patient selection criteria, analysis of each surgical step, and postoperative care.

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Purpose: To determine the functional and structural effects of trabeculectomy surgery on patients with advanced glaucoma and central visual field defects in the early post-operative period.

Methods: Thirty consecutive adult subjects with advanced glaucoma requiring trabeculectomy surgery and an established visual field defect within 10° of fixation underwent microperimetry (MAIA MP-1, CenterVue, Padova, Italy) and optic disc optical coherence tomography (OCT) imaging (Spectralis, Heidelberg Engineering, Germany) pre-operatively, and 1 month and 3 months following trabeculectomy surgery. Main outcome measures were post-trabeculectomy change in mean threshold on microperimetry and nerve fibre layer thickness on OCT.

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Purpose: To determine whether microperimetry or optical coherence tomography (OCT) imaging can detect early disease in the fellow eye of patients with unilateral focal ischaemic glaucoma.

Methods: Thirty-seven consecutive adult patients with unilateral focal ischaemic glaucoma with a unilateral split-fixation visual field defect on standard automated perimetry (SAP) with normal SAP in the fellow eye were selected. All patients underwent microperimetry (MAIA, CenterVue, Italy) of the central 10 degrees and OCT imaging (Spectralis, Heidelberg Engineering, Germany) of the retinal nerve fibre layer of both eyes.

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Importance: Ocular surface disease (OSD) is common and can reduce treatment compliance and quality of life.

Background: To determine whether a punctal plug improves OSD and reduces intraocular pressure (IOP) in patients using prostaglandin analogue monotherapy.

Design: Randomized controlled trial.

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Background/aims: To determine the mortality within 20 years of diagnosis of chronic open-angle glaucoma (COAG) and visual acuity and visual field progression of a cohort followed for 20 years.

Methods: Twenty years following the diagnosis of COAG in 68 of 436 (16%) patients seen in a glaucoma case-finding clinic, visual and mortality outcomes were audited from medical records. Causes of death were obtained from general practitioner records and death certificates.

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Purpose: UK demographic and legislative changes combined with increasing burdens on National Health Service manpower and budgets have led to extended roles for community optometrists providing locally-commissioned enhanced optometric services (EOS). This realist review's objectives were to develop programme theories that implicitly or explicitly explain quality outcomes for eye care provided by optometrists via EOS and to test these theories by investigating the effectiveness of services for cataract, glaucoma, and primary eye care.

Methods: The review protocol was published on PROSPERO, and RAMESES publication standards were followed.

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Purpose: To establish the safety of the CHANGES glaucoma referral refinement scheme (GRRS).

Methods: The CHANGES scheme risk stratifies glaucoma referrals, with low risk referrals seen by a community based specialist optometrist (OSI) while high risk referrals are referred directly to the hospital. In this study, those patients discharged by the OSI were reviewed by the consultant ophthalmologist to establish a 'false negative' rate (Study 1).

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Purpose: Although visual impairment is a well-recognized consequence of cataract development, little is known about the ability of the melanopsin-based photosensitive retinal ganglion cells (pRGCs) to regulate sleep-wake timing in the presence of cataract. In this study, we replaced a cataractous natural crystalline lens with two different types of artificial intraocular lenses, a UV-blocking lens or a blue-filtering lens. We investigated the level of sleep disturbance before cataract surgery and any change in sleep due to improved light transmission following surgery and compared this in both types of intraocular lens.

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Objectives: A comparison of glaucoma referral refinement schemes (GRRS) in the UK during a time period of considerable change in national policy and guidance.

Design: Retrospective multisite review.

Setting: The outcomes of clinical examinations by optometrists with a specialist interest in glaucoma (OSIs) were compared with optometrists with no specialist interest in glaucoma (non-OSIs).

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Purpose: To assess the impact of referral refinement criteria on the number of patients referred to, and first-visit discharges from, the Hospital Eye Service (HES) in relation to the National Institute for Health & Clinical Excellence (NICE) Glaucoma Guidelines, Joint College Group Guidance (JCG) and the NICE commissioning guidance.

Methods: All low-risk (one risk factor: suspicious optic disc, abnormal visual field (VF), raised intra-ocular pressure (IOP) (22-28 mmHg) or IOP asymmetry (>5 mmHg) and high-risk (more than one risk factor, shallow anterior chamber or IOP >28 mmHg) referrals to the HES from 2006 to 2011 were analysed. Low-risk referrals were seen by Optometrists with a specialist interest in glaucoma and high-risk referrals were referred directly to the HES.

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Aim: To investigate whether the publication of the National Institute for Health and Clinical Excellence (NICE) glaucoma guidelines had an effect on the agreement of examination findings between professionals involved in an established glaucoma referral refinement pathway.

Methods: To report inter-professional agreement for the clinical examination findings of optometrists with a special interest in glaucoma (OSI), optometrists with no specialist interest in glaucoma (non-OSI) and a glaucoma consultant. Part 1 investigated agreement between an OSI and consultant and part 2 investigated agreement of clinical findings between the non-OSI and a specialist clinician (OSI or consultant).

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Aims: The aims were to compare a novel conjunctival mould used to assist the delivery of intravitreal drugs to a conventional technique with respect to patient, surgeon and cost benefit.

Methods: A prospective review of 200 intravitreal injections was undertaken, 100 using a 'conventional' freehand technique (group 1) and 100 using a novel conjunctival mould (group 2). Intraoperative visual analogue scale (VAS) pain scores, patient preference, surgeon perception of the ease of insertion of the conjunctival mould were recorded as well as a cost comparison.

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Purpose: To study the impact of a new power-delivery option using occlusion-triggered bursts of longitudinal phaco energy in addition to torsional tip movement in the performance of the 30-degree mini-flared tip to minimize tip clogging with dense nuclei.

Setting: Prince Charles Eye Unit, King Edward VII Hospital, Windsor, United Kingdom.

Design: Comparative case series.

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