2Glaucoma New Zealand Aims to eliminate blindness and visual disability from glaucoma in our communityinform and educate people about how best to live with glaucoma
3Glaucoma in General Practice The aim of this initiative is to:Compare the presentation of glaucoma and cataract in General PracticeAddress detection of glaucoma by optic disc assessment.Review the “Risk Factors” for glaucomaClarify the role of health and life-style issues in patients with glaucoma.
4A Common Clinical Encounter This is a true patient scenario..
5Visual loss from ..... A Christchurch CASE : A 81 yr old man is referred by his GP for urgent cataract surgery for his very poor vision.He was having visual difficulties coping with living alone and was concerned about his driving.He thought that charity or public hospital cataract surgery would be the answer...
6Past eye historyFive years earlier an eye specialist diagnosed ocular hypertension and started timolol eye drops. The patient completed the dispensed medication then stopped treatment. No follow up occurred.The referring GP enclosed a copy of the reply letter from the eye specialist when the patient was seen five years earlier. It gave the above detailed history.
7Ocular examination inThe best corrected visual acuity was: Right : 6 / 24 Left : 6 / 9The intra-ocular pressure was: Right : 40 mm Hg Left : 40 mm HgThe optic discs were both markedly cupped: cup / disc ratios Right 0.9+ Left 0.9There was extensive visual field loss (see later)There were early lens opacities present in both eyes as is common in this age group
8Humphrey visual fields in this patient Right Visual FieldLeft Visual Field
9Humphrey Visual Fields The patients visual field is a “blackout” !There is minimal response centrally in the left visual field. But none in the right field. The mean deviation of loss is over 25 decibel in each eye.The blackout doesn’t mean he is totally blind but that the highest intensity of light for the machine has been reached. And he still cannot see itWhatever, it is disastrous for the patient !
10Implications for this man... Primary open angle glaucoma is the main threat to this man’s eyesight, his independence and his driving licence.Most of his sight loss cannot be restored.Treatment of his ocular hypertension for five years would have prevented this situation.A further delay of a few months would have been disastrous for him with intra-ocular pressures at 40 mm Hg and with markedly cupped optic discs.
11ImplicationsA priority appointment should be given for this patient, if the referral letter states :Visual acuity does not improve with a Pin HoleRaised intra-ocular pressure.Markedly cupped optic discsVisual field defectsYou suspect glaucomaNone of these factors were noted.Preventing treatable blindness is an order of priority higher than restoring sight from cataract, which can be done at anytime.
12OutcomeThis patient fortunately received an early appointment because he went privately despite limited means and no insurance.Initial glaucoma treatment was commenced and he had investigations and follow up in public.He will not be able to return to driving. Which means you and your loved ones may live longer !
14Cataract and glaucoma compared The patient will present to you when the visual disability reaches the threshold for that person to complain about their vision.“Screening” for cataract is not required.Visual acuity with a pinhole is near normal for early to modest cataract (and refractive errors)Vision can be restored by surgery at any stage in the development of cataract from a clear lens to one that has been dense for years.
15Cataract and glaucoma compared The patient will complain of visual problems only at a late stage in glaucoma development.The sight lost cannot be restored (this century!)The cupped optic disc is at high risk for sudden loss of vision from a retinal vein occlusion, which adds insult to the injury !Early treatment is effective in preventing progression in glaucoma damage. (Level 1 evidence: multiple double blind trials)
16Glaucoma in General Practice THREE considerations for today:Detecting glaucoma : symptomatic and asymptomatic patients.Assessment of “Glaucoma Risk Factors” : determines appropriate monitoring and may indicate pre-glaucoma intervention. (reviewed)Evaluation of health and life-style issues that may accelerate damage to the cupped and compromised optic disc in those with glaucoma.
17Detecting Glaucoma In Patients with symptoms and In Patients without symptoms (everyone !)
18In patients with symptoms: Blurred vision, gradual visual loss, etcDo Pinhole VA. If No improvement be concerned for serious eye pathology (not cataract or refractive errors). But a good PH VA does NOT exclude severe glaucoma.Assess risk factors for glaucoma. (see review)Assess the optic disc. (see below)Consider assessment of the visual field (to be discussed in the next GNZ presentation)
19In patients with symptoms: Painful inflamed eye : consider angle closureAssess risk factors (see review) Age, Asian, Hypermetropia, Family historyAsk about halos around lights (corneal oedema)The pupil may be mid-dilated (if small, the diagnosis is more likely to be iritis)The intra-ocular pressure will be very high and must be measured.The optic disc will be normal except in chronic angle closure when it will be cupped.
20In people without symptoms : Asymptomatic presentation occurs most often:Early to moderately severe glaucoma usually presents without symptoms !Check Glaucoma out when the opportunity arises.The “Routine General Check up” Anyone requesting a “routine check up” is asking “What will kill me, what will harm me, doctor ?” Firstly cancer, secondly blindness, is the public’s concern in many surveys.That means glaucoma !
21The first Glaucoma NZ Powerpoint presentation for General Practitioners gave an overview of glaucoma in your practice. It addressed “Risk Factors”. See it onThis presentation mainly focuses on the optic disc in glaucoma.We acknowledge that the skill of ophthalmoscopy cannot be taught here. But we note that new types of ophthalmoscope are available to help the non- specialist to view the optic disc.
22Optic Disc Assessment Ophthalmoscopy Direct viewing is most convenient for you. Indirect viewing uses a slit lamp microscope.Documentation of the optic disc: Draw the disc and its cup Assess the vertical ratio of the cup diameter to the disc diameter. Record as a decimal eg 0.3Optic disc scanning : a technical assessment GDx, OCT, HRT machines. They will become widely used in the next few years.
23Optic Disc Parameters to check Optic disc size and shape. Larger discs have larger cups ! There is more room for the same number (1.2 million) of nerve fibres.Optic shape is similar in both eyes in most people. The exception is highly myopic eyes.Neuro-retinal rim: The ISNT rule is that it is thickest Inferiorly, reducing Superiorly, Nasally then Temporally in the normal disc.Disc margin haemorrhage (an important sign)Peripapillary atrophy
24The Neuro-retinal rim / nerve fibres GENERALISED LOSSAssess the cup / disc ratio esp. vertically.Assess the thickness of the rim to the cup.A normal cup is oval horizontally.The glaucomatous cup is often oval vertically.The mean c /d ratio is 0.3 with a wide range !Your index of suspicion will be enhanced if you see a large c / d ratio. (As in the patient described.)Asymmetry in the c / d ratio between eyes is very significant. (< 0.2 difference in 98 %)
25The Neuro-retinal rim / nerve fibres LOCALISED LOSSLook for localised notches in the rim.Focal loss is often inferiorly, then superiorly.Record as the c / d ratio in that meridian eg. c/d 0.9 at 5 o’clockPALE DISCSGlaucomatous discs may look pale as the cup deepens and enlarges. BUT..True pallor of the rim ( the remaining nerve fibres) is optic atrophy NOT glaucoma.
26Typical cortical cataract shadows in the red reflex Typical cortical cataract shadows in the red reflex. Expect good Pin hole acuity here or consider dual pathology
27Fundus photo of the same eye Fundus photo of the same eye. Blurred view from cataract but optic disc visible : healthy disc with cup / disc ratio of 0.3
28The optic disc in glaucoma Glaucoma is defined by progressive cupping of the disc.A single observation of the discs may alter your management of your patient.You will assess all risk factors that you can, and determine an appropriate course of action.You may seek a full eye examination where otherwise no action may have been taken.You may write “suspicious of glaucoma” which will generate a priority response !!
29The optic disc in glaucoma The following table outlines a range of optic disc for comparison with your patient.The image can be downloaded from the GP Arena onYour optic disc findings should be considered along with the clinical presentation and your assessment of the “Risk Factors” for glaucoma.Asymptomatic patients with NO risk factors, refer: OD c / d ratio of > 0.8 OD notch, haemorrhage, or asymmetry.An evidence based guide does Not exist
30“Optic Nerve Head Signs in Glaucoma”, is kindly provided by Dr Allan Simpson of Christchurch. The file is attached for you to print and use for comparison with the optic discs you see in your patients ! The vertical cup to disc ratio is an assessment of the diameter of the cup as a ratio of the disc. It is given as a decimal. 0.1 is a very small cup ; healthy ! 1.0 means there is no neuro retinal rim remaining. Its too late !
31Please Promote Glaucoma Awareness SUMMARYYou are in the best position to prevent glaucoma blindness in your patients.Glaucoma is progressive cupping of the optic disc which you may be able to detect at least when the cupping is severe.Patients may be harmed when visual blur is put as cataract. A non urgent priority may be given..Glaucoma should be considered in other patient presentations and especially when patients request a “Routine general check up”Please Promote Glaucoma Awareness
33Risk Factors for Open Angle Glaucoma Identified without an eye examinationAgeFamily historyHigh myopiaPrevious eye traumaSteroid useAgeOpen angle glaucoma can occur before 40 yrs of age but it is rare unless there is a family history or there is raised intra-ocular pressure secondary to previous trauma, steroid use or other eye pathology.Family HistoryFamily history in first degree relatives increases the risk by 10 fold. Some families have a strong history of glaucoma with advanced glaucomatous cupping. Such families should have more frequent eye examinations.Steroid use on and around the eye increase intra-ocular pressure in susceptible individually. The response to steroids is genetically determined. Prolonged steroid use to the eye or eyelids requires regular eye examniations.
34Risk Factors for Open Angle Glaucoma Identified by an eye examinationIntra-ocular pressureCentral corneal thicknessOptic disc structureIntra-ocular pathology Pseudo-exfoliation. Pigment dispersion Vascular and inflammatory disease Congenital abnormalitiesAgeOpen angle glaucoma can occur before 40 yrs of age but it is rare unless there is a family history or there is raised intra-ocular pressure secondary to previous trauma, steroid use or other eye pathology.Family HistoryFamily history in first degree relatives increases the risk by 10 fold. Some families have a strong history of glaucoma with advanced glaucomatous cupping. Such families should have more frequent eye examinations.Steroid use on and around the eye increase intra-ocular pressure in susceptible individually. The response to steroids is genetically determined. Prolonged steroid use to the eye or eyelids requires regular eye examniations.
35Risk Factors for Angle Closure Glaucoma AgeFamily historyHypermetropia (long sightedness)Anterior chamber (AC) morphology Shallow AC, narrow AC anglesRace : Asian
36The gold standard : “45 plus 5” Glaucoma NZ recommends that every adult have an eye examination at age 45 years and every 5 years there-after.Individuals with significant risk factors detected by examination require more frequent assessment.By aged 80 yrs, many will need 2 yearly examination.
37The General Practitioner and Glaucoma Awareness Promote the “45 + 5” glaucoma eye testIdentify glaucoma risk factors for greater attentionIncorporate Glaucoma Awareness and screening recommendations into every day practice.
38Health and life-style issues in the patient with glaucoma
39Health and life-style issues in the patient with glaucoma Diabetes mellitus, hypertension and vascular diseasePrimary glaucoma is not more frequent here.Routine Glaucoma Eye Examinations should be done according to the standard recommendation above, in these patients.However the cupped disc may be at risk if there is high, low or fluctuating blood pressure.Treat these conditions gently !Stable good control is recommended.
40Health and life-style issues in the patient with glaucoma Vascular spasm eg migraine, Raynaud’sRoutine Glaucoma Eye Examinations should be done according to the standard recommendation above.Vascular spasm is implicated in glaucoma progression in “Normal Tension Glaucoma” where non-pressure factors appear to play a significant role in cupping the optic disc.Stable good control is recommended.
41Health and life-style issues in the patient with glaucoma Special life-style issues (theoretical)Short term IOP fluctuations maybe harmful : Head down Yoga positions, Valsalva manoeuvres e.g. playing wind instrumentsSituations with low pO2 : e.g. prolonged high altitude, climbers, glider pilotsPatients with marked glaucoma damage may need to modify some life-style choices.
42Glaucoma in your General Practice A successful outcome of this initiative would be:You thinking “Glaucoma” when your patient complains of blurred vision etc.You assessing the optic disc for marked cupping by ophthalmoscopy in your patients to identify a need for urgent referral.You appreciating the known risk factors or markers, for developing glaucoma, that call for greater attention than in the normal population.You considering the effect on optic disc perfusion when managing your patient’s general health.
43General Practice and Glaucoma NZ Glaucoma New Zealand welcomes general practitioner involvement in our mission to “eliminate glaucoma blindness from our community”.Glaucoma NZ provides a “Professional Education Package” on-line that presents ten glaucoma cases with questions, answers and discussion. You are welcome to register for it.Glaucoma New Zealand welcomes your feedback on this presentation.
44Public education about glaucoma Glaucoma New Zealand provides information to the public who enrol with us. There is no fee.We publish “Eyelights” a regular newsletter, maintain a web site, and produce additional educational materials. SeePlease encourage your patients with glaucoma to enrol with us.
45Glaucoma New Zealand wishes to thank our sponsors without whose help we could notundertake our activities
48General Practice and Glaucoma NZ You can support our cause by:DonationsSponsorshipInvolvement in our activities in your area.Promoting bequests to GlaucomaGlaucoma New Zealand thanks you for your time and consideration with this presentation
49Glaucoma New Zealand Department of Ophthalmology The University of AucklandPrivate Bag 92019AucklandTelFax