Primary Health Care Eye Health Sensitization

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’)

VA Min of Arc WHO Definition

20/20 1 min Normal20/40 2 min mild LV20/60 3 min WHO

definition LV20/70 3.5min Mod LV

20/200 10 min Severe LV20/400 20 min Profound LV

20/1000 50 min Near 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

• 15 + 50 = 65 m needing Low Vision Services

Global Picture

11/11/201011/11/2010 NFPTraining in LVCNFPTraining in LVC

37mBlind

124m"Low vision"

7mNo PL

BlindPL+30m

15mCurable

74 mCurable50m

For LV Care15mFor

LV care

161m Visually impaired

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 eyeballIRIS 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.

Cataract

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 Cont’d

• 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

Diabetic Retinopathy

• Definition• Prevalence• Treatment• Risk Factors

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

Glaucoma

• Increased Intra-Ocular Pressure (IOP)

• Changes in Optic Nerve

• Peripheral Vision

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 GlaucomaOpen-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

Childhood Blindness

• Definition

• Prevalence

• Treatment

• Risk Factors

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.

Uncorrected Refractive Errors and Low Vision

• Definition

• Prevalence

• Treatment

• Risk Factors

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.

• TreatmentThis 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

Environment

• Lighting

• Improved Contrast

• Bold

• Magnification

• Tactile

Vision Aids

• People with low vision may be helped with low vision device–Magnifiers

–Telescopes

–CCTV

–JAWS


Magnifiers


Telescope

Vision Assessment• History

• Distance Acuity

• Near Vision

• Other

• Referral • Follow Up


Vision Assessment Tools

Eye Screening• Correct Environment

– lighting– noise– distractions

• Correct Distance– 20 foot– 10 foot

• Correct Tool– choice of chart

This workshop is funded by the European Union04/20/23 57

This workshop is funded by the European Union04/20/23 58

School Eye Screening

WHO?

• Kindergarten

• Grade 6

School Eye Screening


Community Health Fairs

Referral Process

• What Perimeters for Referral?

• Who to Refer to?

• Follow-Up?

SAINT LUCIA BLIND WELFARE ASSOCIATION

DOCTOR REFERRAL FORM

Name: Date of Birth: Address: Vision Screening: OD

V OS Comments: Name of Doctor: Date of Examination: Diagnosis: Treatment: Follow up: _______________________ Doctor’s Signature

Referral Form

• This is a sample referral form used by St. Lucia Blind Welfare Association

• Each country should use their own referral form or referral system

PRESENTED BY

Tel: (268) 462-4111/462-6369E-MAIL: [email protected]

www.eyecarecaribbean.com

The End

Primary Health Care Eye Health Sensitization

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