Clinical comparison of the measurement of the IOP with the ocular blood flow tonometer, the Tonopen XL and the Goldmann applanation tonometer

Bafa, Maria; Lambrinakis, I.; Dayan, Margaret; Birch, Michael

doi:10.1034/j.1600-0420.2001.079001015.x

Cited by 39 publications

(34 citation statements)

References 15 publications

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“…The authors also compared IOP values determined in an outpatient setting using Goldmann tonometry versus values measured during 24-hour phasing using Tono-pen, but argue that the use of Tono-pen in circadian measurements may in fact have underestimated IOP peaks and fluctuation, because data suggest that the Tono-pen may produce lower values than Goldmann at the higher part of the IOP spectrum. 4 In a similar study, Barkana et al 6 reviewed the records of 32 OAG patients who underwent Goldmann tonometry in the sitting position every two hours from 7 AM until midnight and Perkins tonometry in the supine position at 6 AM. They compared office-hours and outside office-hours values recorded on the same 24-hour IOP curve for each patient, as well as IOP values determined in up to five previous outpatient visits.…”

Section: Circadian Iop Variations In Treated Eyesmentioning

confidence: 99%

24-hour Intraocular Pressure and Ocular Perfusion Pressure in Glaucoma

Quaranta

Katsanos

Russo

et al. 2013

Survey of Ophthalmology

137

147

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Abstract. This review analyzes the currently available literature on circadian rhythms of intraocular pressure (IOP), blood pressure, and calculated ocular perfusion pressure (OPP) in patients with openangle glaucoma. Although adequately powered, prospective trials are not available. The existing evidence suggests that high 24-hour IOP and OPP fluctuations can have detrimental effects in eyes with glaucoma. The currently emerging continuous IOP monitoring technologies may soon offer important contributions to the study of IOP rhythms. Once telemetric technologies become validated and widely available for clinical use, they may provide an important tool towards a better understanding of longand short-term IOP fluctuations during a patient's daily routine. Important issues that need to be investigated further include the identification of appropriate surrogate measures of IOP and OPP fluctuation for patients unable to undergo 24-hour measurements, the determination of formulae that best describe the relationship between systemic blood pressure and IOP with OPP, and the exact clinical relevance of IOP and OPP fluctuation in individual patients. Despite the unanswered questions, a significant body of literature suggests that OPP assessment may be clinically relevant in a significant number of glaucoma patients. (Surv Ophthalmol 58:26--41, 2013. Ó 2013 Elsevier Inc. All rights reserved.) Key words. glaucoma circadian rhythm intraocular pressure blood pressure ocular perfusion pressure I. Physiological ConsiderationsThe principal physiological entities that affect intraocular pressure (IOP) and its characteristics are the aqueous humor (AH) dynamics in healthy and glaucomatous eyes.The production of AH involves two consecutive processes. First, a portion of the plasma that reaches the vascular plexus of the ciliary processes is filtered through the fenestrated capillaries into the interstitial space between the vessels and the ciliary epithelia. Next, a portion of the filtrate is actively secreted by the ciliary epithelial cells into the posterior chamber.In humans, these processes are affected by age, circadian rhythm, topical and systemic medications, and the presence of glaucoma. 63,64,70,109,121 The rate of AH formation decreases with age: by 15--35% between age 20 and 80 years. 15,30 The rate of AH production in humans is significantly lower at night, 99,119 attributed to decreased endogenous circulating catecholamine levels, which may partly explain the decreased nocturnal efficacy of topical 26

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Section: Circadian Iop Variations In Treated Eyesmentioning

confidence: 99%

24-hour Intraocular Pressure and Ocular Perfusion Pressure in Glaucoma

Quaranta

Katsanos

Russo

et al. 2013

Survey of Ophthalmology

137

147

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“…In six studies 144,153,157,166,206,216 (40%), cases were selected consecutively. Nine studies 75,138,140,144,157,169,188,191,216 (60%) reported individual measures taken within 1 hour and 10 studies 75,138,140,144,166,169,188,206,207,216 (61%) that the same clinical data were available for interpretation as would be in clinical practice.…”

Section: Quality Assessmentmentioning

confidence: 99%

Surveillance for ocular hypertension: an evidence synthesis and economic evaluation.

Burr

Botello-Pinzon²,

Takwoingi³

et al. 2012

Health Technol Assess

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How to obtain copies of this and other HTA programme reports An electronic version of this title, in Adobe Acrobat format, is available for downloading free of charge for personal use from the HTA website (www.hta.ac.uk). A fully searchable DVD is also available (see below).Printed copies of HTA journal series issues cost £20 each (post and packing free in the UK) to both public and private sector purchasers from our despatch agents.Non-UK purchasers will have to pay a small fee for post and packing. For European countries the cost is £2 per issue and for the rest of the world £3 per issue. How to order:-fax (with credit card details) -post (with credit card details or cheque) -phone during office hours (credit card only).Additionally the HTA website allows you to either print out your order or download a blank order form. Contact details are as follows:Synergie UK (HTA Department) Digital House, The Loddon Centre Wade Road Basingstoke Hants RG24 8QW Email: orders@hta.ac.uk Tel: 0845 812 4000 -ask for 'HTA Payment Services' (out-of-hours answer-phone service) Fax: 0845 812 4001 -put 'HTA Order' on the fax header Payment methods Paying by chequeIf you pay by cheque, the cheque must be in pounds sterling, made payable to University of Southampton and drawn on a bank with a UK address.Paying by credit card You can order using your credit card by phone, fax or post. SubscriptionsNHS libraries can subscribe free of charge. Public libraries can subscribe at a reduced cost of £100 for each volume (normally comprising 40-50 titles). The commercial subscription rate is £400 per volume (addresses within the UK) and £600 per volume (addresses outside the UK). Please see our website for details. Subscriptions can be purchased only for the current or forthcoming volume.How do I get a copy of HTA on DVD?Please use the form on the HTA website (www.hta.ac.uk/htacd/index.shtml). HTA on DVD is currently free of charge worldwide.The website also provides information about the HTA programme and lists the membership of the various committees. HTA NIHR Health Technology Assessment programmeThe Health Technology Assessment (HTA) programme, part of the National Institute for Health Research (NIHR), was set up in 1993. It produces high-quality research information on the effectiveness, costs and broader impact of health technologies for those who use, manage and provide care in the NHS. 'Health technologies' are broadly defined as all interventions used to promote health, prevent and treat disease, and improve rehabilitation and long-term care. The research findings from the HTA programme directly influence decision-making bodies such as the National Institute for Health and Clinical Excellence (NICE) and the National Screening Committee (NSC). HTA findings also help to improve the quality of clinical practice in the NHS indirectly in that they form a key component of the 'National Knowledge Service' . The HTA programme is needs led in that it fills gaps in the evidence needed by the NHS. There are three routes to the start of projects...

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“…Several authors have demonstrated that tonopen tends to overestimate low IOPs and underestimate high IOPs [7,8,9,10]. Others have concluded that there is no such variation [11,12].…”

Section: Indirectmentioning

confidence: 99%

Tonometry: an overview

Singh¹

2014

IOSR-JDMS

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Clinical comparison of the measurement of the IOP with the ocular blood flow tonometer, the Tonopen XL and the Goldmann applanation tonometer

Cited by 39 publications

References 15 publications

24-hour Intraocular Pressure and Ocular Perfusion Pressure in Glaucoma

24-hour Intraocular Pressure and Ocular Perfusion Pressure in Glaucoma

Surveillance for ocular hypertension: an evidence synthesis and economic evaluation.

Tonometry: an overview

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