OQ 77
OQ77 1 SENSIMED's Triggerfish device
Audio content
- Speaker(s):
- David Docherty, Stephanie Cairns
OQ77 2 Measuring IOP
Audio content
- Speaker(s):
- Dan Rosser, David Cartwright
OQ77 3 DCT and contact lenses
Audio content
- Speaker(s):
- Daniela Nosch, Malcolm Long
OQ77 Quarterly Review
Audio content
- Speaker(s):
- Bruce Evans
- Closing Date:
- 23 June 2011
- Speaker(s):
- Introduced by Geoff Watts
Full Synopsis
SENSIMED’s Triggerfish device – David Docherty & Stephanie Cairns
SENSIMED is a Swiss medical device company specialising in integrated micro-systems. They have recently developed a contact lens-based sensor which is able to monitor intraocular pressure over a 24-hour period. Stephanie Cairns heard about the sensor, known as Triggerfish, and used our online survey to suggest it as a topic for OQ. In this programme she speaks to David Docherty, of SENSIMED, about some of the benefits the technology offers patients with glaucoma. They discuss how the device works, the impact it is having for those already using it, and the advantages it has over traditional IOP measurement practices.
Measuring IOP – Dan Rosser & David Cartwright
Dr Dan Rosser is Principal Optometrist and Head of the Optometry Department at the Norfolk & Norwich University Hospital. Dan has a specialist interest in glaucoma, having worked in an 'extended role' capacity within the glaucoma services of a number of NHS Trusts over the past 15 years. In this interview, David asks Dan about the clinical reasoning for measuring intraocular pressure over a 24-hour period. In particular, they discuss why IOP changes throughout the day – and why certain groups of patients would find 24-hour monitoring especially useful. Dan also comments more broadly on how developments like the SENSIMED Triggerfish could affect the diagnosis and treatment of glaucoma.
The DCT and contact lenses – Daniela Nosch & Malcolm Long
In this interview, Malcolm Long speaks with Daniela Nosch from the University of Applied Sciences Northwestern Switzerland. A recent study carried out by Daniela and her colleagues suggested that the presence of contact lenses does not alter the accuracy of dynamic contour tonometry measurements, which are also independent of corneal thickness and rigidity. The interview touches on Daniela’s findings and compares this type of tonometry to Goldmann applanation tonometry. Daniela then discusses the benefits it can have for some groups of patients and for optometrists in countries not registered to use diagnostic drugs.
Quarterly Review – Bruce Evans
Bruce Evans, filling in for Geoff Roberson as a guest reviewer in this edition, begins by taking a look at a recent study into the intraocular pressure of professional brass and woodwind musicians. He goes on to discuss clinical measurement of eye movements, and whether there is an easier alternative to expensive eye-tracking equipment. Bruce considers the Developmental Eye Movement Test and discusses three recent papers which have greatly improved our understanding in this area. Finally, he reviews a paper which investigates what a patient’s description of photopsia can tell you about the risk of retinal tear or detachment being present.
More Information
References
Sensimed’s Triggerfish device
Leonardi M et al. 2009, Wireless contact lens sensor for intraocular pressure monitoring: assessment on enucleated pig eyes, Acta Ophtalmol 87, 433-437
Mansouri K, Shaarawy T. 2011, Continuous intraocular pressure monitoring with a wireless ocular telemetry sensor: initial clinical experience in patients with open angle glaucoma. Br J Ophthalmol [Epub ahead of print]
Measuring IOP
Barkana Y, Anis S, Liebmann J, Tello C, Ritch R. 2006, Clinical utility of intraocular pressure monitoring outside of normal office hours in patients with glaucoma. Arch Ophthalmol 124, 793-797
Hughes E, Spry P, Diamond J. 2003, 24-hour monitoring of intraocular pressure in glaucoma management: a retrospective review. J Glaucoma. 12(3), 232-6
Moodie J, Wilde C, Rotchford AP, Vernon SA, King AJ. 2010, 24-Hour versus daytime intraocular pressure phasing in the management of patients with treated glaucoma. Br J Ophthalmol 94(8), 999-1002
Mosaed S, Liu JHK, Weinreb RN. 2005, Correlation between office and peak nocturnal intraocular pressures in healthy subjects and glaucoma patients. Am J Ophthalmol 139, 320-324
Realini T, Weinreb RN, Wisniewski S. 2010, Diurnal intraocular pressure patterns are not repeatable in the short term in healthy individuals. Ophthalmology 117, 1700–1704
Realini T, Weinreb RN, Wisniewski . 2011, Short-term repeatability of diurnal intraocular pressure patterns in glaucomatous individuals. Ophthalmology 118, 47–51
Sultan MB, Mansberger SL, Lee PP. 2009, Understanding the importance of IOP variables in glaucoma: a systematic review. Surv Ophthalmol 54(6), 643-62
The DCT and contact lenses
Boehm AG, Weber A, Pillunat LE, Koch R, Spoerl E. 2008, Dynamic contour tonometry in comparison to intracameral IOP measurements. Invest Ophthalmol Vis Sci 49(6), 2472-7
Ehlers N, Bramsen T, Sperling S. 1975, Applanation tonometry and central corneal thickness. Acta Ophthalmol (Copenh) 53(1), 34-43
Kaufmann C, Bachmann LM, Thiel MA. 2004, Comparison of dynamic contour tonometry with goldmann applanation tonometry. Invest Ophthalmol Vis Sci 45(9), 3118-21
Schwenn O, Troost R, Vogel A, Grus F, Beck S, Pfeiffer N. 2002, Ocular pulse amplitude in patients with open angle glaucoma, normal tension glaucoma, and ocular hypertension. Br J Ophthalmol 86(9), 981-4
Whitacre MM, Stein R. 1993, Sources of error with use of Goldmann-type tonometers. Surv Ophthalmol 38(1), 1-30
Zhang MZ, Fu ZF, Liu XR, Zheng C. 2004, A comparison study of pulsitile ocular blood flow in normal eyes and primary open angle glaucoma. Zhonghua Yan Ke Za Zhi. 40(4), 250-3
Quarterly Review
Ayton LN, Abel LA, Fricke TR, McBrien NA. 2009, Developmental eye movement test: what is it really measuring? Optom Vis Sci 86(6), 722-730
Gilbert LC. 1953, Functional motor efficiency of the eyes and its relation to reading. University of California Publications in Education 11(3), 159-232
Goodfellow JF, Mokete B, Williamson TH. 2010, Discriminate characteristics of photopsia in posterior vitreous detachment, retinal tears and retinal detachment. Ophthalmic Physiol Opt 30(1), 20-23
Medland C, Walter H, Margaret Woodhouse J. 2010, Eye movements and poor reading: does the Developmental Eye Movement test measure cause or effect? Ophthalmic Physiol Opt 30(6), 740-747
Schmidtmann G, Jahnke S, Seidel EJ, Sickenberger W, Grein HJ. 2011, Intraocular pressure fluctuations in professional brass and woodwind musicians during common playing conditions. Graefes Arch Clin Exp Ophthalmol
Webber A, Wood J, Gole G, Brown B. 2011, DEM Test, Visagraph Eye Movement Recordings, and Reading Ability in Children. Optom Vis Sci 88(2), 295-302
