glaucoma- a basic overview · glaucoma consultant milton keynes university hospital nhs foundation...
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![Page 1: Glaucoma- A Basic Overview · Glaucoma Consultant Milton Keynes University Hospital NHS Foundation Trust Glaucoma- A Basic Overview Glaucoma Patient Support Group October 2017. Medical](https://reader033.vdocuments.us/reader033/viewer/2022050504/5f95ec37065aa1651340412b/html5/thumbnails/1.jpg)
Mr Areeb Moosavi MBBS BSc FRCOphth
Glaucoma Consultant
Milton Keynes University Hospital NHS Foundation Trust
Glaucoma- A Basic OverviewGlaucoma Patient Support Group
October 2017
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Medical Retina Firm, June 2008
13th Oct 2017
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Medical Retina Firm, June 2008
A Funny Story……
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Medical Retina Firm, June 2008
What is Glaucoma?
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Definitions
What is Glaucoma?
– Umbrella term for group of conditions
resulting in progressive optic nerve
damage and a characteristic pattern of
corresponding visual field loss
2% of those >40 years old
‘Eye Pressure-sensitive’
No ‘cure’ yet
Progression slowed by reducing IOP
from baseline / highest (by at least a
third)
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Medical Retina Firm, June 2008
What is Ocular Hypertension?
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Definitions
‘Normal’ Eye pressure 10 - 21 mmHg
What is Ocular Hypertension (OHT)?
– Higher than average IOP (>21mmHg)
without any evidence for nerve damage or
visual field loss
Can convert to glaucoma (approx 10%)
OHT Patients are often related to
glaucoma patients
Consider treating if IOP > 30mmHg
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Medical Retina Firm, June 2008
What is ‘Normal Tension’ glaucoma?
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Definitions – Normal Tension Glaucoma
‘Normal’ Eye pressure (10 - 21 mmHg)
NTG - Normal eye pressure but still
getting progressive glaucoma
Thought to be related to poor circulation
or poor blood supply to optic nerve
Association with migraine and low BP
Still worth lowering eye pressure
(reduces daily fluctuations)
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Relative numbers of glaucoma and OHT
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Medical Retina Firm, June 2008
What is ‘Open angle’ and ‘Closed
angle’ glaucoma?
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Medical Retina Firm, June 2008
Open Versus Closed angle
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Why can glaucoma be missed?
Usually no symptoms – central vision
usually last to go
Binocular compensation
Prevent Blindness America Survey
2002
– 50% heard of glaucoma but unsure what it
was
– 30% Never heard of glaucoma
– 20% knew related to eye pressure (most
thought it would have symptoms, could be
easily cured and did not lead to blindness)
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Background statistics
Second biggest cause of blindness worldwide
Ageing Population
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Medical Retina Firm, June 2008
Global Ageing – Number of people > 60 years)
http://www.helpage.org/global-agewatch/population-ageing-data/population-ageing-map/
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Background statistics
Second biggest cause of blindness worldwide
Ageing Population
Variation in access to care;
– Europe: 1 ophthalmologist / 10,000 population
– India: 1 ophthalmologist / 400,000 population
– Africa: 1 ophthalmologist / 1 million population
Rapidly Growing Population of MK
– Grown by 43,000 since 2001
– 20.2% growth compared to 8.9% for England
76% of UK people would rather lose limb than their
eyesight (Fightforsight website)
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MK Population projections
0
50
100
150
200
250
300
350
1974 1984 1994 2004 2014 2024
Population
(1000’s)
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Monitoring of Glaucoma and OHT
1) Intraocular Pressure (IOP)
2) Optic Nerve Assessment (“Cupping”)
3) Visual Fields
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Medical Retina Firm, June 2008
Monitoring of Glaucoma & OHT:1. Intraocular Pressure (IOP)
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Monitoring of Glaucoma & OHT:1. Intraocular Pressure (IOP)
“normal” range 10-21mmHg (Caucasian Europeans)
Up to 4mmHg difference between eyes normal.
Abnormal > 8mmHg
IOP very dynamic and variable
– Diurnal variation (Highest early morning, >10mmHg variation
abnormal)
– Eye movements
– Breathing Patterns
– Physical activity
– Supine vs sitting up
– Seasonal variations (higher jan-feb and lowest in may-aug)
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Medical Retina Firm, June 2008
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Medical Retina Firm, June 2008
Liu et al, IOVS 1999 40:12
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Barkana et al Arch Ophthalmol. 2006;124:793-797
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Todani et al IOVS 2011
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SENSIMED Triggerfish®
(Sensimed, Lusanne, Switzerland)
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60 y.o Male. POAG. Latanoprost at 22.00. GAT 13 at baseline, 15 after 24 hrs
79 y.o Female. POAG. Alphagan 9 & 17.30. Latanoprost at 22.00. GAT 14 at baseline, 16 after 24 hrs
56 y.o Male. PXF. Latanoprost at 23.00. GAT 21 at baseline, 23 after 24 hrs
Mansouri &
Shaarawy
BJO 2011
95;627
Change in therapy in 11/15 (73%) of patients.
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Medical Retina Firm, June 2008
Central Corneal Thickness (CCT)
(Influence on IOP measurement)
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Corneal Thickness Measurement (Pachymetry)
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Central Corneal Thickness (CCT)
Independent risk factor for development of glaucoma
Tendency to overestimation of IOP in thick corneas
(>555um)
Tendency to underestimation of IOP in thin corneas
(<555um)
CCT (microns) IOP (mmHg) Glaucoma Risk
>555 (thick) <21 (normal) average
>555 (thick) >24 (high) +
<555 (thin) <21 (normal) ++
<555 (thin) >24 (high) +++++
555 (average) <21 (normal) Average
555 (average) >24 (high) +++
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Monitoring of Glaucoma and OHT
1) Intraocular Pressure (IOP)
2) Optic Nerve Assessment (“Cupping”)
3) Visual Fields
![Page 37: Glaucoma- A Basic Overview · Glaucoma Consultant Milton Keynes University Hospital NHS Foundation Trust Glaucoma- A Basic Overview Glaucoma Patient Support Group October 2017. Medical](https://reader033.vdocuments.us/reader033/viewer/2022050504/5f95ec37065aa1651340412b/html5/thumbnails/37.jpg)
Medical Retina Firm, June 2008
Monitoring of Glaucoma & OHT:2. Optic Nerve assessment
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Medical Retina Firm, June 2008
Monitoring of Glaucoma & OHT:2. Optic Nerve assessment
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Medical Retina Firm, June 2008
Monitoring of Glaucoma & OHT:2. Optic Nerve assessment
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Medical Retina Firm, June 2008
Disc Haemorrhage
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Medical Retina Firm, June 2008
Nerve Fibre layer defect on red free photograph
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Monitoring of Glaucoma and OHT
1) Intraocular Pressure (IOP)
2) Optic Nerve Assessment (“Cupping”)
3) Visual Fields
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Medical Retina Firm, June 2008
Monitoring of Glaucoma & OHT:3. Visual Fields
Normal Left Eye
Progressive glaucoma Left Eye
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatmentGlaucoma and Driving
Future Directions
Glaucoma in perspective
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Management Overview
Observation
Drops (usually one to start with)
More Drops / Combination drops
Surgery (Trabeculectomy / Tube)
Laser (Cyclodiode)
Laser (SLT / Iridotomy)
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Surgical treatments
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Cataract Surgery
Known to lower eye pressure
Effect can last 3 years or more
Lens extraction for angle closure / narrow angles
Good first procedure before Trabeculectomy or
Tube surgery
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Aqueous Shunt Surgery (Tube)
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Laser Treatments
Yag Laser Iridotomy
For closed / narrow drainage angles
Usually both eyes
Clinic procedure
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Laser Treatments
ALT
Argon Laser TrabeculoplastySLT
Selective laser Trabeculoplasty
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Cyclodiode Laser Ciliary Body Photocoagulation
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Glaucoma and Driving
Only need to inform DVLA if both eye
fields affected
Not up to me! DVLA decides
Need horizontal 1200 with 20o above
and below the horizontal (“letter box”)
Esterman fields done with both eyes
open
Legal obligation of patient to inform
DVLA
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Medical Retina Firm, June 2008
Driving & Glaucoma
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Medical Retina Firm, June 2008
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Medical Retina Firm, June 2008
Driving & Glaucoma
Driving Videos
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Slow release inserts(Amorphex TODDD implant) Slow release implants (pSivida, SKS Ocula)
Drug releasing tear duct plugs(Ocular Therapeutix)
Drug releasing contact lenses
(UCLA)
Possible future alternatives to drops
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MIGS(Minimally Invasive Glaucoma Surgery)
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Medical Retina Firm, June 2008
Xen Implant
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Medical Retina Firm, June 2008
XEN implant
Ahmed Valve
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Overview
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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RNIB Website
Estimated Number of People living with Glaucoma
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Medical Retina Firm, June 2008
Certification of Visual Impairment (CVI) rates
RNIB Website
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Perspective
Glaucoma pick up and management
much better in developed world
Compliance with drops and keeping
appointments reduces risk of disease
progression
Rate of absolute blindness from
glaucoma thankfully relatively small
Majority of patients will not lose
significant vision in their lifetime
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Medical Retina Firm, June 2008
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Summary
Definitions
Background Statistics
Monitoring of Glaucoma
Management & treatment
Glaucoma and Driving
Future Directions
Glaucoma in perspective
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Despite all our efforts…..Videos of the real world!
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Thank you all for coming today.