Presentation on theme: "Primary Health Care Eye Health Sensitization This presentation was developed by The Caribbean Council for the Blind with financial support for the European."— Presentation transcript:
Primary Health Care Eye Health Sensitization This presentation was developed by The Caribbean Council for the Blind with financial support for the European Union
Aim of PHC training To sensitize (at least) 1,240 Primary Healthcare/community workers and teachers. To promote eye health awareness and screening of children and adults at the community level To develop the ability to identify and refer cases to secondary facilities. To sensitize a network of individuals with the common goal of screening up to 6 million people over the next 5 years. To contribute to the reduction of the prevalence of blindness and visual impairment in the targeted countries (including) Guyana, Haiti, Jamaica and St. Lucia.
What is Vision? What is Vision Acuity? What is Functional Vision?
Visual Acuity describes the degree of visual resolution Contrast is the ratio of light/dark and describes the border of the image ( reduced contrast is often describes as glare)
VAMin of ArcWHO Definition 20/201 minNormal 20/402 minmild LV 20/603 minWHO definition LV 20/703.5minMod LV 20/20010 minSevere LV 20/40020 minProfound LV 20/ minNear total blindness Vision Acuity (in the better eye with presenting vision )
Functional Vision Bangkok definition: A person with low vision is one who has impairment of visual functioning even after treatment and/or standard refractive correction and has a visual acuity of less than 6/18 to light perception, or a visual field less than 10 degrees from the point of fixation, but who uses, or is potentially able to use vision for the planning and/or execution of a task. (WHO, 1992) Levak (1991) Definition: Having a significant visual impairment but also having some usable vision: moderate low vision is acuity of 20/70 – 20/160 (better eye with correction) severe low vision is acuity of 20/200 – 20/400 or visual field of 20 degrees or less Corn (1981)Definition: One who is still severely visually impaired after correction, but who may increase visual functioning through the use of optical aids, non-optical aids, and or techniques
Premise There are differences in the ways children with congenital low vision and adults with adventitious low vision use and learn to use vision There are differences with how children and adults with different types of low vision (e.g., low acuity, reduced visual fields) use and learn to use vision.
Premise There are different levels of visual efficiency that can be achieved at different levels of visual functions (e.g., 20/100 vs. 20/800). Visual functions and functional vision go hand in hand.
Prevalence of Blindness How Big a Problem is It
10 37 million blind 7 m with NLP = require substitute training Of 30 m remaining…50% require surgery 15 m requiring low vision care 124 million Low Vision 74 m require cataract surgery (60%) 50m requiring low vision services = 65 m needing Low Vision Services Global Picture
Caribbean Picture Blind –Prevalence 1% of the population Causes of blindness –Cataract: 52% –Cataract and Open Angle Glaucoma: 9% –Open Angle Glaucoma alone: 10% –Diabetic retinopathy: 10% –Others: 19% Low vision –Prevalence 3% of the population
Anatomy Of The EYE
CORNEA clear, transparent section of the outer coat of the eyeball SCLERA white part of the eye forming an external protective coat CHOROID vascular, intermediate coat providing nourishment to the eyeball IRIS coloured part of the eye in front of the lens regulating the amount of light entering the eye by changing the size of the pupil PUPIL opening at the centre of the iris LENS transparent body that focuses light passing through the eye on the retina RETINA the innermost lining of he eye connected with the optic nerve and upon which any visual image is focused. Has nerve cells for sight (rods and cones) MACULA small depression in the retina adapted for fine vision OPTIC NERVE part of the central nervous system carrying the sense of sight from the retina to the brain. AQUEOUS clear, watery fluid that fills the front part of the eye VITREOUS transparent, gelatinous material filling the eyeball behind the lens
Priority Eye Conditions in the Caribbean Cataract Diabetic Retinopathy Glaucoma Childhood Blindness Uncorrected Refractive Errors and Low Vision
Cataract Cataract is clouding of the lens of the eye which impedes the passage of light. Although most cases of cataract are related to the ageing process, occasionally children can be born with the condition, or a cataract may develop after eye injuries, inflammation, and some other eye diseases.
Prevalence of Cataract Global –Age related cataract is responsible for 48% of world blindness, which represents about 18 million people. Caribbean (Barbados Eye Study) –Cataract is responsible for 52% of blindness
Prevalence of Cataract Contd Although cataracts can be surgically removed, in many countries surgical services are inadequate, and cataract remains the leading cause of blindness. As people in the world live longer, the number of people with cataract is growing. Cataract is also an important cause of low vision in both developed and developing countries. Even where surgical services are available, low vision associated with cataract may still be prevalent, as a result of the long period spent waiting for operations and barriers to surgical uptake, such as cost, lack of information, and transportation problems.
Treatment of Cataract The treatment of cataract is an operation, which is very successful in restoring sight. The opaque lens is removed and replaced by an artificial intraocular lens.
This workshop is funded by the European Union After Before
Risk Factors for Cataract Age diabetes mellitus hypertension trauma high body mass cigarette smoking ultraviolet light exposure alcohol consumption
Definition of DR Characteristic group of lesions found in the retina of individuals having had diabetes mellitus for several years. Diabetic retinopathy is considered to be the result of vascular changes in the retinal circulation. In the early stages vascular occlusion and dilations occur. Progresses into a proliferative retinopathy with the growth of new blood vessels Macular edema (the thickening of the central part of the retina) can significantly decrease visual acuity.
Prevalence of DR It is estimated that in 2002 Diabetic Retinopathy (DR) accounted for about 5% of world blindness, representing almost 5 million persons who are blind. In the Caribbean DR has a prevalence of 5.9% and increases to 28.5% for those who suffer from Diabetes. (Barbados Eye Study) As the incidence of diabetes gradually increases, there is the possibility that more individuals will become blind from the disease
Treatment of DR The following actions can decrease some of the risk to vision caused by diabetic retinopathy. Eating a balanced diet and reduced consumption of sugar sweetened drinks. Regular exercise, including walking as much as possible. Maintaining a normal blood sugar level.
Risk Factors for DR Duration of diabetes Level of glycemia Presence of high blood pressure Dependence on insulin Pregnancy Levels of selected serum lipids Nutritional and genetic factors
Diagnosis for Glaucoma A precise comprehensive definition and diagnostic criteria are yet to be finalised. People with glaucoma probably lose their sight because increased pressure in the eye and other factors (such as poor blood flow) affect the optic nerve at the back of the eye. The eye slowly loses nerve function, and loss of side (peripheral) vision. This occurs painlessly, even unnoticeably. There are several types of glaucoma, however, the two most common are primary open angle glaucoma (POAG), having a slow and insidious onset, and angle closure glaucoma (ACG), which is less common and tends to be more acute.
Prevalence of Glaucoma Worldwide –61 million projected –8 million by 2020 US –1.86% > age 40 –10% > age 70 Caribbean (Barbados Eye Study) –7% > age 40 –16% > age 70
Treatment of Glaucoma Open-Angle Glaucoma Treatment with eye drops to decrease the IOP. Note: you may need to change from one type to another. This is a life-long disease and your eyes must be checked regularly to make sure you are getting the best treatment. You must follow the strict medication schedule your doctor gives you. You must not allow your glaucoma drops to run out Surgery is an option (trabeculectomy) Glaucoma patients should be encouraged to request this option. Will Help to prevent further loss of vision.
Risk Factors for Glaucoma Family History Age Nearsightedness Ethnic background Raised IOP Trauma Diabetes Cataract
Definition of Childhood Blindness Childhood blindness has many causes. In poor countries the main ones are: – corneal scarring and cataract. –ROP (Retinopathy of prematurity) –Some causes of blindness is hereditary.
Prevalence of Childhood Blindness 1.4 million are children under 16. (of the 45 million global blindness) 1.5 per 1000 In low-income countries 0.3 per 1000 children in high-income countries Closer to 1 per thousand in Caribbean countries. The vast majority of childhood blindness happens before the age of five. Puberty is believed to be a significant cause of visual impairment –Usually correctable with prescription glasses.
Treatment Prevention and treatment of childhood blindness is disease specific. Properly planned and implemented national vaccination programmes against measles has reduced the prevalence of eye complications. In middle income countries, retinopathy of prematurity (ROP) is among the leading causes of blindness, the incidence of which can be reduced through availability and affordability of screening and curative services. Early treatment of cataract and glaucoma can be beneficial, while low vision devices are helpful in children with residual vision. Early detection of visual impairment and prescription of appropriate eye glasses, is important.
Definition of Refractive Error myopia (short-sightedness) hyperopia (long-sightedness) astigmatism (when the eye can sharply image a straight line lying only in one meridian).
Prevalence of Refractive Error World wide, severe refractive errors have been estimated to account for about 5 million persons who are blind. According to the most recent data available to WHO, there are an estimated 124 million people in the world with low vision. Caribbean Prevalence –Myopia 22% >age 40 –Hyperopia 47% > age 40
Treatment of Refractive Error Refractive errors can be rectified with appropriate optical correction GLASSES
Presbyopia As people age, they often begin to have difficulty focusing their eyes for reading or close work. This is called presbyopia and is the normal aging of the eyes. It usually affects people over the age of forty as the eye starts to lose some of its flexibility. Treatment This condition is easily corrected with eye glasses of increasing strength as a person ages. Bifocal of trifocal lenses may be prescribed to some people with presbyopia who also have other refractive problems such as myopia (near-sightedness), hyperopia (far-sightedness) or astigmatism (distorted vision due to a irregularly shaped cornea).
Definition of Low Vision (WHO) Low vision is visual acuity less than 6/18 and equal to or better than 3/60 in the better eye with best correction. When does a person require Low Vision Services ? One who has impairment of visual functioning even after treatment and/or standard refractive correction, and has a visual acuity of less than 6/18 to light perception, or a visual field less than 10 degrees from the point of fixation, but who uses, or is potentially able to use, vision for the planning and/or execution of a task for which vision is essential.
Prevalence of Low Vision There are an estimated 180 thousand persons in the Caribbean with low vision. Three (3) out of every one hundred persons in your village-district could be affected by low vision. 1 out of every 4 could benefit from low vision services
Treatment of Low Vision Lighting Environment Magnification Vision Aids